Research Articles
2026
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
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Substituting rare-earth elements such as Gd, Tb, and Ho into FePt-C granular films lowers blocking temperature while largely maintaining magnetization, although perpendicular anisotropy decreases because ordering is reduced. | Kim Kong Tham, Daiki Miyazaki, and Shin Saito | AIP Advances |
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FePt granular films with rare earth element oxides as
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Ferromagnetic grain boundary materials such as Fe3O4, Nd2O3, Sm2O3, Tb4O7, Eu2O3, CeO2, and Gd2O3 promote magnetic cluster separation and raise saturation magnetization in FePt granular films, offering a route to improved thermal and magnetic performance. | Daiki Miyazaki, Kim Kong Tham, Shin Saito | AIP Advances |
2025
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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Carbon-Pt buffer layers act as agglomeration-suppressed metal-island underlayers, improving grain separation and reducing in-plane orientation in FePt granular films. This enhances anisotropy and supports better microstructure control in granular magnetic media. |
Kim Kong Tham, Ryosuke Kushibiki, Daiki Miyazaki, and Shin Saito |
Journal of Science: Advanced Materials and Devices |
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In FePtCu-C buffer layer / FePt-B2O3 granular film systems, Cu diffusion modifies lattice parameters, grain size, and order, making Cu-containing buffer layers useful for microstructure control in FePt-based granular media. | Kim Kong Tham, Daiki Miyazaki, and Shin Saito | IEEE Transactions on Magnetics |
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Carbon substitution in FePt-oxide granular films brings magnetic properties closer to FePt-C systems by enhancing perpendicular magnetic anisotropy and degree of order while reducing the fraction of grains with c-axes parallel to the film plane. | Kim Kong Tham, Ryosuke Kushibiki, Daiki Miyazaki, and Shin Saito | IEEE Transactions on Magnetics |
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Stacked buffer layers such as Pt-C/FePtCu-C and Ag-C/FePtCu-C increase magnetocrystalline anisotropy and suppress in-plane grain orientation in FePt granular films. Ag-C/FePtCu-C also yields smaller FePt grain size than Pt-C/FePtCu-C. | Daiki Miyazaki, Kim Kong Tham, Shin Saito | IEEE Transactions on Magnetics |
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Atomic Layer Growth of Pt Films using Dimethyl(N,N-Dimethyl-3-Butene-1-Amine-N)Platinum and O3
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Paper on the deposition of ultra-thin Pt films by O3-ALD using Pt precursor DDAP | Minseok Kim, Taeseok Kim, Jihoon Jeon, Gwang Min Park, Sung-Chul Kim, Sung Ok Won, Ryosuke Harada, and Seong Keun Kim | Applied Surface Science |
| CVD-grown Ir3Se8 films (0.67 eV bandgap) show strong NIR response and high NO2 gas sensing performance. | Jaehyeok Kim, Minji Kim, Inkyu Sohn, Jisang Yoo, Taehyun Kim, Chanju Lee, Yusuke Ohshima, Shinichi Kato, Tatsuya Nakazawa, and Hyungjun Kim | Surfaces and Interfaces | |
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Highly active iridium oxide catalysts are well known as catalysts used in the oxygen evolution reaction in water electrolysis, but the reason for the high activity of iridium oxide catalysts has remained unknown until now due to the complex reactions occurring on the electrode surface with its hierarchical structure. In this report, the origin of this high activity has been elucidated. | Neha Thakur, Yadan Ren, Mukesh Kumar, Tomoki Uchiyama, Mitsuharu Fujita, Ikkei Arima, Minoru Ishida, Yingkai Wu, Yuta Tsuji, Hideto Imai, Masashi Matsumoto, Yu Zhuang, Kentaro Yamamoto, Toshiyuki Matsunaga, Koji Ohara, Mitsuhiro Matsumoto, Yuki Orikasa, Yoshiyuki Kuroda, Shigenori Mitsushima, and Yoshiharu Uchimoto | ACS Journal of American Chemical Society |
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Surface Plasmon Resonance Induced Nucleation of Protein
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Study on protein crystallization reaction on Au nanostructures. | Tetsuo Okutsu, Taku Yasue, Miku Murakami, Asuka Ito, Tomohiko Sato, Ryoya Nakayama, Tomoka Takasuka, Yoshikiyo Hatakeyama, Soshi Shiraishi, Tatsuya Shoji, Yasuyuki Tsuboi, Yutaka Kasuya, Masahiro Ito, Katsuya Tenjitsu, Akihiro Takura, and Hiroaki Horiuchi | Advances in Organic Crystal Chemistry |
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Systematic investigation of the properties of ordered B2 structure Ru-Al-Ni alloys
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Systematic characterization of Ru-Al-Ni heat-resistant alloys | Fumihiko Saito, Tatsuya Nakazawa and Shuichi Kubota | MRS Advances |
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Scalable alloy-based sputtering of high-conductivity PdCoO2 for advanced interconnects
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CVD-grown RuSe2 and sulfurized RuSSe films show tunable bandgaps (0.52-1.39 eV) and strong NIR photodetection performance. | Takayuki Harada, Zuin Ping Lily Ang, Yuki Sakakibara, Takuro Nagai, and Yasushi Masahiro | Applied Physics Letters |
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A study investigating the thermal decomposition behavior and thermal decomposition energy of the Ru precursor Ru(TMM)(CO)3 in the gas phase using a mass spectrometer. | Ken Miyajima, Toshiaki Nagata, Fumitaka Mafuné, Tomohiro Tsugawa and Ryosuke Harada | Physical Chemistry Chemical Physics |
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Fabrication of RuSSe thin films using our Ru precursor and band gap control | Jaehyeok Kim, Hwi Yoon, Inkyu Sohn, Tatsuya Nakazawa, Sangyoon Lee, Donghyun Kim, Yusuke Ohshima, Hiroki Sato, Seunggi Seo, Sojeong Eom, Seung-Min Chung, and Hyungjun Kim | Rare Metals |
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Role of NOx and Supported RuO2 in Accelerating Soot Oxidation over RuO2/CeO2-ZrO2
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When we investigated soot oxidation on a precious metal/CeO2-ZrO2 catalyst under NO2 flow, we found that only Ru oxide reduced the reaction temperature. However, the active oxygen species was not NOx species but the lattice oxygen of CeO2. We concluded that adsorbed NOx species promoted soot oxidation through redox. | Hitoshi Kubo, Yusuke Ohshima, Shunsuke Kato, Noriyuki Saitoh, Noriko Yoshizawa, Osamu Nakagoe, and Shuji Tanabe | Applied Catalysis A, General |
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Tunable structural rearrangement in Cu cluster assemblies through linker and solvent alterations
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A new crystal consisting of an accumulation of particles called nanoclusters was synthesized, and its structure was analyzed and evaluated using single crystal XRD. | Saikat Das, Jin Sakai, Riki Nakatani, Ayumu Kondo, Rina Tomioka, Subhabrata Das, Shuntaro Takahashi, Tokuhisa Kawawaki, Sourav Biswas and Yuichi Negishi | Chemical Science |
2024
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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A thin carbon buffer layer in FePt-B2O3 granular films boosts perpendicular magnetic anisotropy by reducing the in-plane texture component, while thicker carbon layers degrade magnetic properties. This identifies an optimal window for buffer-layer engineering in FePt thin films. | Kim Kong Tham, Ryosuke Kushibiki, and Shin Saito | AIP Advances |
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Effect of the Supported Metal Species on Soot Oxidation over PGM/CeO2-ZrO2
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Investigating soot oxidation on precious metal/CeO2-ZrO2 catalysts, we found that Ru, Rh, and Ir oxides reduced the reaction temperature. We confirmed that the active oxygen species was the lattice oxygen of CeO2, and that these metal species supplied oxygen to the support, making it easier to reduce the support. | Hitoshi Kubo, Yusuke Ohshima, Shunsuke Kato, Noriyuki Saitoh, Noriko Yoshizawa, Osamu Nakagoe, and Shuji Tanabe | Bulletin of the Chemical Society of Japan |
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Metallic nanofilms on Si(100) and SiO2 grown with a ruthenium precursor
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Study on the initial film growth behavior on Si(100) and SiO2 surfaces using Ru precursor Ru(TMM)(CO)3. | Leonid Bolotov, Yohei Kotsugi, Tomohiro Tsugawa, Shutaro Asanuma and Noriyuki Uchida | Japanese Journal of Applied Physics |
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A paper on substrate-selective deposition using ozone as a reactive gas for Ir precursor TICP. | Han Kim, Taeseok Kim, Hong Keun Chung, Jihoon Jeon, Sung-Chul Kim, Sung Ok Won, Ryosuke Harada, Tomohiro Tsugawa, Sangtae Kim, and Seong Keun Kim | Small |
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Bonding Strength Evaluation of Sub-Micron Au Particle Bumps for High Density Packaging | Yuichi makita, Akihito Fujino, and Kenichi Inoue | Journal of the Japan Institute of Electronics Packaging |
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Recovery Technologies for Precious Metals
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This paper will discuss the current status and trends of precious metal recycling and the current issues surrounding the precious metal recycling process. | Akihiko Okuda | The Chemical Times |
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Pt nanoparticles were deposited on 2D WS2 by ALD, resulting in enhanced photodetection sensitivity. | Dain Shin, Inkyu Sohn, Donghyun Kim, Jaehyeok Kim, Taehyun Nam, Youngjun Kim, Jusang Park, Tatsuya Nakazawa, Seung-Min Chung, and Hyungjun Kim | Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films |
2023
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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For FePt-TiN granular films, moderate N2 addition improves ordering, increases anisotropy, and enhances coercivity without raising the in-plane grain fraction. Nitrogen-driven Ti segregation makes TiN a useful grain boundary material in FePt thin films. | Kim Kong Tham, Ryosuke Kushibiki, and Shin Saito | Japanese Journal of Applied Physics |
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Ejection of boron from L10 phase for sputtered
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Post-annealing Fe50Pt50-BN granular films in NH3 promotes two-phase separation, increases magnetization, and changes grain orientation toward a more ordered structure. The results indicate that B solid solution in FePt grains strongly affects magnetic behavior in FePt-BN films. | Daiki Isurugi, Gento Tanaka, Takashi Saito, Kim Kong Tham, Tomoyuki Ogawa, and Shin Saito | Japanese Journal of Applied Physics |
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Systematic study of nitride matrix of FePt granular films for heat assisted magnetic recording media
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Compared with oxide systems, FePt-nitride granular films show higher magnetization and a smaller in-plane component at similar GBM melting points. This makes nitride-based grain boundary materials promising for granular magnetic media and FePt thin film development. | Kim Kong Tham, Ryosuke Kushibiki, and Shin Saito | AIP Advances |
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Partially replacing nitride grain boundary materials with carbon in FePt-nitride-C granular films enhances anisotropy, increases order, and improves grain separation. High average melting point GBMs also help reduce cluster size, which is beneficial for high-density magnetic recording. | Kim Kong Tham, Ryosuke Kushibiki, and Shin Saito | IEEE Transactions on Magnetics |
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A unit cell analysis method for L10-FePt alloy films reveals that unit cell volume remains nearly unchanged with ordering, but increases when N2 or H2 is incorporated. Nitrogen stretches the c-axis anisotropically, while hydrogen expands the lattice more isotropically. | Daiki Isurugi, Gento Tanaka, Takashi Saito, Kim Kong Tham, Tomoyuki Ogawa, and Shin Saito | Transaction of the Magnetics Society of Japan |
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Blocking Phenomenon of Hard/Soft Bilayer L10-FePt Grains in Granular Film
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Structurally inhomogeneous L10-FePt grains containing hard and soft regions show unique blocking behavior near the Curie temperature. Matching the Curie temperatures of the two regions improves switching robustness, which is relevant to HAMR media and cap-layer design. | Daiki Isurugi, Takashi Saito, Kim Kong Tham, Tomoyuki Ogawa, Yoichiro Tanaka, Simon John Greaves | IEEE Transactions on Magnetics |
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Evaluation of blocking temperature and its distribution for L10-type FePt granular films
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The blocking temperature and its distribution in L10-FePt granular films depend strongly on the grain boundary material, with SnO outperforming TiO2 in thermal stability. These findings are directly relevant to heat-assisted magnetic recording (HAMR) and hard disk design. | Daiki Isurugi, Takashi Saito, Shun Kaneko, Kim Kong Tham, Tomoyuki Ogawa, Shin Saito | Japanese Journal of Applied Physics |
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Gas sensor properties improved by ALD deposition of Pt nanoparticles on 2D WS2 | Dain Shin, Inkyu Sohn, Jaehyeok Kim, Tatsuya Nakazawa, Sangyoon Lee, Hwi Yoon, Jisang Yoo, Jusang Park, Seung-Min Chung, and Hyungjun Kim | ACS Applied Nano Materials |
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A bottomless barrier structure for via applications was investigated using area-selective ALD (AS-ALD) with TANAKA's Ru precursor Ru(TMM)(CO)3 and ZnO, enabling selective Ru deposition for advanced semiconductor interconnects. | Yuki Mori, Taehoon Cheon, Yohei Kotsugi, Youn-Hye Kim, Yejin Park, Mohd Zahid Ansari, Debananda Mohapatra, Yujin Jang, Jong-Seong Bae, Woobin Kwon, Gahui Kim, Young-Bae Park, Han-Bo-Ram Lee, Wooseok Song, and Soo-Hyun Kim | Small |
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Trends in Precious Metal Recycling
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This paper will discuss the current status and trends of precious metal recycling and the current issues surrounding the precious metal recycling process. | Akihiko Okuda | Society of Environmental Resources Engineering |
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Nucleation and Layer Closure Behavior of Iridium Films Grown by Atomic Layer Deposition
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Research on O2-ALD of Ir precursor TICP. It was revealed that the behavior in the early stages of film formation affects the roughness and continuity of the Ir film. | Hong Keun, Chung Han, Kim Jihoon, Jeon Sung-Chul, Kim Sung, Ok Won, Ryosuke Harada, Tomohiro Tsugawa, Yoon Jang Chung, Seung-Hyub Baek, Tae Joo, Park Seong, and Keun Kim | The Journal of Physical Chemistry Letters |
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Crystals composed of assembled nanoclusters were newly synthesized and exhibited photoluminescence (PL) properties. The PL intensity was found to decrease upon exposure to nitrobenzene, indicating potential sensing functionality. | Taishu Sekine, Jin Sakai, Yusuke Horita, Haruna Mabuchi, Tsukasa Irie, Sakiat Hossain, Tokuhisa Kawawaki, Subhabrata Das, Shuntaro Takahashi, Saikat Das, and Yuichi Negishi | Chemistry-A European Journal |
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Sputter-grown c-axis-oriented PdCoO2 thin films
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c-axis PdCoO2 films grown by sputtering show layered structure, low resistivity, and promise for high-work-function electrodes. | T. Harada, T. Nagai, M. Oishi, and Y. Masahiro | Journal of Applied Physics |
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Silver Cluster-Assembled Materials for Label-Free DNA Detection
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Crystals composed of assembled nanoclusters were newly synthesized and evaluated as fluorescence quenchers to enhance sensitivity in DNA detection. | Saikat Das, Taishu Sekine, Haruna Mabuchi, Sakiat Hossain, Subhabrata Das, Shun Aoki, Shuntaro Takahashi and Yuichi Negishi | Chemical Communications |
2022
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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In FePt-BN granular films, adding around 2% N2 maximizes coercivity, anisotropy field, and perpendicular magnetic anisotropy by improving grain separation and promoting B segregation to grain boundaries. Excess nitrogen, however, degrades the ordered L10-FePt structure. | Kim Kong Tham, Saito Takashi, Ryosuke Kushibiki, and Shin Saito | IEEE Transactions on Magnetics |
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One-sided directional slot antenna with magnetic film for 28 GHz application
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A one-sided directional slot antenna using a magnetic film on the back side suppresses backside radiation and improves gain and front-to-back ratio. This expands the application of magnetic thin films into 28 GHz antenna and high-frequency device design. | Koto Miyahara, Takeshi Ishibashi, Kim Kong Tham, Kumar Goodwill, Haruichi Kanaya | IEEE 24th Electronics Packaging Technology Conference (EPTC) |
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Recycling Precious Metals from Urban Mines to Make Medals
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The gold and silver medals for the Tokyo 2021 Olympic and Paralympic Games were produced using recycled precious metals sourced from urban mining, with the process spanning collection, refining, and plating technologies. | Tasuku Arimoto, Kozo Hayashi, and Takashi Hayashi | Journal of The Surface Finishing Society of Japan |
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A high-sensitivity rapid dengue diagnostic kit, TKK 1st/2nd, was developed and evaluated primarily using DENV-2 samples from Bangladesh. Further validation with other serotypes is required to improve overall diagnostic accuracy. | Kanaporn Poltep, Juthamas Phadungsombat, Nathamon Kosoltanapiwat, Borimas Hanboonkunupakarn, Witthawat Wiriyarat, Sarin Suwanpakdee, Phirom Prompiram, Emi E. Nakayama, Keita Suzuki, Hisahiko Iwamoto, Tatsuo Shioda, and Pornsawan Leaungwutiwong | Virology Journal |
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Quantitative Two-Stage Classification of Gas Mixtures Using 2D TMDC and PGM Chalcogenides
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A gas mixture classification method using chemiresistive sensors based on 2D TMDCs and platinum-group chalcogenides achieved over 90% accuracy for NO₂, NH₃, and their mixtures. Combined with a two-stage data analysis model, the approach demonstrates strong potential for practical gas sensing applications in healthcare and industry. | Inkyu Sohn, Joungbin An, Dain Shin, Jaehyeok Kim, Tatsuya Nakazawa, and Yohei Kotsugi | IEEE Sensors Journal |
| Tomoyuki Fujinami | Materials Science Society of Japan | ||
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Atomic Layer Deposited RuO2 Diffusion Barrier for Next Generation Ru-interconnects
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Atomic layer deposition (ALD) using TANAKA's Ru precursor Ru(TMM)(CO)3 enables high-quality Ru thin films tailored for semiconductor device applications. | Youn-Hye Kim, Minsu Kim, Yohei Kotsugi, Taehoon Cheon, Debananda Mohapatra, Yujin Jang, Jong-Seong Bae, Tae Eun Hong, Rahul Ramesh, Ki-Seok An, and Soo-Hyun Kim | Advanced Functional Materials |
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RuS2 was fabricated using Ru atomic layer deposition followed by post-sulfurization, and its near-infrared photodetection performance was evaluated. | Tatsuya Nakazawa, Donghyun Kim, Jaehyeok Kim, Yohei Kotsugi, Taehoon Cheon, Seung-Min Chung, Soo-Hyun Kim, and Hyungjun Kim | Rare Metals |
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Development of Precious Metals to Support Hydrogen and Digital Societies
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Processing technologies for palladium membranes used in hydrogen permeation and AuSn lids for quartz crystal oscillator package sealing are introduced. | Takao Asada, and Suichi Kubota | Bulletin of the JSTP |
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Atomic Layer Deposition of Iridium Using a Tricarbonyl Cyclopropenyl Precursor and Oxygen
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Atomic layer deposition (ALD) using TANAKA's Ir precursor TICP enables high-quality Ir thin films for semiconductor applications as well as efficient catalysts for hydrogen evolution (HER) and oxygen evolution reactions (OER). | Na-Yeon Park, Minsu Kim, Youn-Hye Kim, Rahul Ramesh, Dip K. Nandi, Tomohiro Tsugawa, Toshiyuki Shigetomi, Kazuharu Suzuki, Ryosuke Harada, Miso Kim, Ki-Seok An, Bonggeun Shong, and Soo-Hyun Kim | ACS Chemistry of Materials |
2021
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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Reducing Gd2O3 content in CoPt-Gd2O3 granular cap layers preserves an ultra-smooth surface while tuning exchange coupling and lowering switching field distribution. This composition control offers a practical route to better full granular media performance. | Kim Kong Tham, Ryosuke Kushibiki, Tomonari Kamada, and Shin Saito | IEEE Transactions on Magnetics |
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Torque analysis of L10-FePt granular media shows that perpendicular magnetic anisotropy is governed mainly by grain orientation and degree of order, not by GBM melting point. Larger grains increase ordering and strengthen anisotropy in FePt granular films. | Takashi Saito, Kim Kong Tham, Ryosuke Kushibiki, Tomoyuki Ogawa, and Shin Saito | IEEE Transactions on Magnetics |
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For FePt granular films, the relationship between magnetic layer thickness, ordering, and perpendicular anisotropy depends on the coexistence of ordered, disordered, and non-epitaxial regions. This highlights the importance of thickness engineering in FePt thin films and granular magnetic media. | Takashi Saito, Kim Kong Tham, Ryosuke Kushibiki, Tomoyuki Ogawa, and Shin Saito | AIP Advances |
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In-plane grains in L10-FePt granular films have structural parameters similar to normal grains, but their population strongly affects perpendicular magnetic anisotropy. Reducing the in-plane fraction is therefore essential for high-performance FePt thin films. | Takashi Saito, Kim Kong Tham, Ryosuke Kushibiki, Tomoyuki Ogawa, and Shin Saito | Japanese Journal of Applied Physics |
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Introducing a FePt-C nucleation layer into stacked FePt granular media improves homogeneity and reduces the in-plane grain component, although some disorder remains. This approach supports better structural control in advanced magnetic recording materials. | Kim Kong Tham, Takashi Saito, Ryosuke Kushibiki, and Shin Saito | IEEE International Magnetic Conference (INTERMAG) |
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Photocurrent Enhancement of PtSe2 Photodetectors by Using Au Nanorods
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Near-infrared photodetection sensitivity of PtSe₂ was enhanced by coating with Au or Ag nanorods, demonstrating plasmon-assisted performance improvement. | Tatsuya Nakazawa, Donghyun Kim, Shinichi Kato, Jusang Park, Jwamin Nam and Hyungjun Kim | Photonics |
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Dual-phase Au-Pt alloys free from magnetic susceptibility artifacts in magnetic resonance imaging
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A dual-phase Au-Pt alloy was developed to minimize MRI artifacts while maintaining high workability, enabling its use in medical devices requiring both MRI compatibility and reliable metal processing. | Ryusuke Nakai, Kenji Goto, Kunihiro Shima, Tomonobu Kodama, and Hiroo Iwata | Magnetic Resonance Imaging |
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A resurgence of Chikungunya virus (CHIKV) occurred in the Maldives in late 2018, with analysis of acute clinical features and viral genotypes identifying it as one of the largest and longest outbreaks recorded in the region. | Hisham Ahmed Imad, Juthamas Phadungsombat, Emi E. Nakayama, Keita Suzuki, Ahmed Mifthah Ibrahim, Aminath Afaa, Aminath Azeema, Aminath Nazfa, Aminath Yazfa, Anoosha Ahmed, Athifa Saeed, Azna Waheed, Fathimath Shareef, Mohamed Moinul Islam, Shausha Mohamed Anees, Sana Saleem, Aminath Aroosha, Ibrahim Afzal, Pornsawan Leaungwutiwong, Watcharapong Piyaphanee, Weerapong Phumratanaprapin, and Tatsuo Shioda | The American Journal of Tropical Medicine and Hygiene |
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Synthesis and Application of AgBiS2 and Ag2S Nanoinks for the Production of IR Photodetectors
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Changes in device performance were evaluated as a function of processing methods for photodetector devices coated with AgBiS₂ and Ag₂S nanoparticles. | Tatsuya Nakazawa, Donghyun Kim, Yusuke Oshima, Hiroki Sato, Jusang Park, and Hyungjun Kim | ACS Omega |
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Atomic Layer Deposition of Ru for Replacing Cu-Interconnects
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Atomic layer deposition (ALD) using TANAKA's Ru precursor Ru(TMM)(CO)3 enables high-quality Ru thin-film formation, supporting advanced applications in semiconductor device fabrication. | Yohei Kotsugi, Seung-Min Han, Youn-Hye Kim, Taehoon Cheon, Dip K. Nandi, Rahul Ramesh, Neung-Kyung Yu, Kirak Son, Tomohiro Tsugawa, Shigeyuki Ohtake, Ryosuke Harada, Young-Bae Park, Bonggeun Shong, and Soo-Hyun Kim | ACS Chemistry of Materials |
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Mechanical properties of Au-Cu-Al alloys were enhanced by introducing the DB19 martensite phase through compositional control. The resulting alloys showed significantly improved strength and ductility while maintaining optical reflectance comparable to pure gold. | Kang-Wei Goo, Wan-Ting Chiu, Ayano Toriyabe, Masahiro Homma, Akira Umise, Masaki Tahara, Kenji Goto, Takumi Sannomiya, and Hideki Hosoda | Materials |
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Synthesis of acetic acid from CO2, CH3I and H2 using a water-soluble electron storage catalyst
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A new Rh complex catalyst enabled acetic acid synthesis using carbon dioxide as the carbon source under mild conditions, providing insight into the reaction mechanism and offering an alternative to conventional methanol-CO processes. | Takeshi Yatabe, Kazuki Kamitakahara, Kaede Higashijima, Tatsuya Ando, Takahiro Matsumoto, Ki-Seok Yoon, Takao Enomoto, and Seiji Ogo | Chemical Communications |
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Effects of flow velocity on ignition characteristics of hydrogen recombination catalyst
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The potential risk of hydrogen explosions triggered by catalytic effects was investigated. The results showed that hydrogen can explode within its flammable concentration range when the temperature reaches 600 °C, highlighting important safety considerations. | Takahiro Tamba, Hitoshi Kubo, Shunsuke Kato, Yusuke Oshima, Takehiro Matsunaga, and Ken Okada | Science and Technology of Energetic Materials |
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Post-Chikungunya Virus Infection Musculoskeletal Disorders: Syndromic Sequelae after an Outbreak
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Following the 2019 Chikungunya virus outbreak in Thailand, some patients developed chronic arthritis characterized by IgG positivity with negative antigen and IgM tests. Inflammation limited finger mobility and affected daily activities but improved with anti-inflammatory treatment. | Hisham A. Imad, Wasin Matsee, Sajikapon Kludkleeb, Punyisa Asawapaithulsert, Juthamas Phadungsombat, Emi E. Nakayama, Keita Suzuki, Pornsawan Leaungwutiwong, Watcharapong Piyaphanee, Weerapong Phumratanaprapin, and Tatsuo Shioda | Topical Medicine and Infections Disease |
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Acute Chikungunya virus (CHIKV) infections in Thailand in 2019 were analyzed using a new antigen test and PCR. Fever and joint pain were the main symptoms, with higher viral loads associated with joint pain, particularly large-joint involvement in female patients. | Hisham A. Imad D, Wasin Matsee, Sajikapon Kludkleeb, Punyisa Asawapaithulsert, Juthamas Phadungsombat, Emi E. Nakayama, Keita Suzuki, Pornsawan Leaungwutiwong, Watcharapong Piyaphanee, Weerapong Phumratanaprapin, and Tatsuo Shioda | Topical Medicine and Infections Disease |
2020
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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In FePt granular films, the melting point of grain boundary materials strongly affects saturation magnetization through phase separation, while grain size and ordering dominate coercivity. This clarifies the distinct roles of GBM selection and microstructure in FePt thin films. | Takashi Saito, Kim Kong Tham, Ryosuke Kushibiki, Tomoyuki Ogawa, and Shin Saito | Japanese Journal of Applied Physics |
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Granular cap layers based on CoPt-RE oxides such as Gd2O3, Nd2O3, Sm2O3, and CeO2 improve anisotropy, reduce switching field distribution, and flatten the surface of CoPt-B2O3 stacked media. These features are valuable for high-density magnetic recording. | Kim Kong Tham, Ryosuke Kushibiki, Tomonari Kamada, and Shin Saito | AIP Advances |
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Single-atom Pt catalysts were deposited by ALD using a novel Pt precursor, enabling efficient Pt utilization on high-surface-area supports. The resulting catalysts demonstrated strong hydrogen evolution reaction (HER) performance with minimal Pt loading. | Rahul Ramesh, Seungmin Han, Dip K. Nandi, Sandesh Y. Sawant, Deok Hyun Kim, Taehoon Cheon, Moo Hwan Cho, Ryosuke Harada, Toshiyuki Shigetomi, Kazuharu Suzuki, and Soo-Hyun Kim | ADVANCED MATERIALS INTERFACES |
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Gold(I) Complexes of Hydantoin Derivatives and Their Properties
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A hydantoin-based Au(I) complex was synthesized and evaluated as a non-cyanide gold plating bath. The bath exhibited low residual chlorine, high stability and oxidation resistance in a neutral pH range, and produced yellow gold deposits with high current efficiency. | Haruko Sasaki | Journal of The Surface Finishing Society of Japan |
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A new monoclonal antibody was developed that detects all three Chikungunya virus (CHIKV) genotypes. Analysis revealed that reduced sensitivity in conventional rapid tests to the Asian genotype was caused by a single amino acid substitution in the E1 protein. | Keita Suzuki, Ralph Huits, Juthamas Phadungsombat, Aekkachai Tuekprakhon, Emi E. Nakayama, Riemsdijk van den Berg, Barbara Barbé, Lieselotte Cnops, Rummana Rahim, Abu Hasan, Hisahiko Iwamoto, Pornsawan Leaungwutiwong, Marjan van Esbroeck, Mizanur Rahman, and Tatsuo Shioda | Virology Journal |
2019
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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Ion Implantation Induced Disorder in FePt-C Thin Films
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Masked ion implantation with 14N+ and 40Ar+ modifies the crystal structure and magnetic anisotropy of FePt-C films. Phase transformation, lattice expansion, and a shift from perpendicular to in-plane anisotropy highlight its usefulness for FePt thin film property control. | Durgesh Kumar, Surbhi Gupta, Kim Kong Tham, Razia Nongjai, Shin Saito, Kandasami Asokan, S. N. Piramanayagam | IEEE Transactions on Magnetics |
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Rare-earth oxide cap layers such as CoPt-Gd2O3, CoPt-Nd2O3, and CoPt-Sm2O3 effectively regulate intergranular exchange in CoPt-B2O3 stacked media. The granular cap structure maintains columnar continuity and improves nucleation and saturation fields in magnetic recording media. | Kim Kong Tham, Ryosuke Kushibiki, Tomonari Kamada, and Shin Saito | IEEE Transactions on Magnetics |
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Direct Patternable Plating Process Replaces Metal-Ink Process
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Direct pattern plating technology is explained, highlighting its ability to form fine metal patterns without conventional lithography processes, enabling simplified fabrication and improved process efficiency. | Masahiro Ito | Journal of The Surface Finishing Society of Japan |
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Evaluation of novel rapid detection kits for dengue virus NS1 antigen in Dhaka, Bangladesh, in 2017
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Dengue virus (DENV) infection is a global health concern, with secondary infections potentially leading to severe dengue hemorrhagic fever (DHF). Accurate diagnosis is critical for DHF risk prediction, driving demand for rapid diagnostic tests; however, current kits suffer from limited sensitivity and cross-reactivity with other flaviviruses such as Zika virus. | Keita Suzuki, Emi E. Nakayama, Akatsuki Saito, Akio Egawa, Tairyu Sato, Juthamas Phadungsombat, Rummana Rahim, Abu Hasan, Hisahiko Iwamoto, Mizanur Rahman, and Tatsuo Shioda | Virology Journal |
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Dengue viruses detected in Bangladesh during 2017-2018 comprised three serotypes and a newly emerging lineage, revealing increased genetic diversity distinct from previously dominant genotypes. | Keita Suzuki, Juthamas Phadungsombat, Emi E. Nakayama, Akatsuki Saito, Akio Egawa, Tairyu Sato, Rummana Rahim, Abu Hasan, Marco Yung-Cheng Lin, Tomohiko Takasaki, Mizanur Rahman, and Tatsuo Shioda | Infection, Genetics and Evolution |
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A Ni atomic layer deposition (ALD) process using a novel Ni precursor was developed, enabling selective Ni film growth on graphene defect sites. The formation of high-quality Ni thin films expands potential applications in semiconductor devices, catalysis, and two-dimensional materials. | Minsu Kim, Shunichi Nabeya, Dip K. Nandi, Kazuharu Suzuki, Hyun-Mi Kim, Seong-Yong Cho, Ki-Bum Kim, and Soo-Hyun Kim | ACS Omega |
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The mechanical deformation behavior and magnetic susceptibility of Au₂CuAl shape memory alloys were evaluated across a range of Cu compositions. Au₂CuAl exhibited stable compressive deformation and low magnetic susceptibility, indicating MRI artifact-free performance, while compositional changes influenced deformation stress and magnetic response. | Kenji Goto, Akira Umise, Masaki Tahara, and Hideki Hosoda | MATERIALS TRANSACTIONS |
2018
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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Reactive sputtering of CoPtCr-SiO2 granular films under controlled Ar + O2 flow improves flatness, corrosion resistance, and composition tuning. Optimized oxygen content supports smooth surfaces and c-axis-oriented grains, which are critical for magnetic recording media performance. | Shingo Sasaki, Kim Kong Tham, Shintaro Hinata, and Shin Saito | Vaccum and Surface science |
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Ru Alloy-oxide Buffer Layer for Intergranular Exchange Decoupling of CoPt-B2O3 Granular Media
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A thin Ru50Co25Cr25-TiO2 buffer layer effectively prevents direct grain contact in CoPt-B2O3 granular media, promoting magnetic decoupling and higher coercivity. Excessive buffer thickness, however, smooths the underlayer and strengthens intergranular exchange coupling. | Kim Kong Tham, Ryosuke Kushibiki, Tomonari Kamada, Shintaro Hinata, and Shin Saito | IEEE Transactions on Magnetics |
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In CoPt granular media with multiple oxides, magnetization, anisotropy, and grain diameter scale with the average oxide melting point. Because Ku and grain size show a trade-off, combining mixed oxides with buffer-layer design is essential for optimized granular magnetic media. | Kim Kong Tham, Ryosuke Kushibiki, Tomonari Kamada, Shintaro Hinata, and Shin Saito | AIP Advances |
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Dual-oxide systems in Co80Pt20-B2O3 granular media allow magnetic properties and grain size to be tuned by partially replacing B2O3 with high-melting-point oxides such as Cr2O3. This strategy refines grains and supports columnar growth in CoPt thin films. | Kim Kong Tham, Ryosuke Kushibiki, Tomonari Kamada, Shintaro Hinata, and Shin Saito | IEEE Transactions on Magnetics |
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Oxide-based nucleation layers such as Nb2O5, WO3, Ta2O5, SiO2, TiO2, Al2O3, Cr2O3, and ZrO2 help form fine columnar grains in CoPt-B2O3 granular media. Early grain separation improves magnetic decoupling and raises coercivity, which is important for high-density recording. | Kim Kong Tham, Ryosuke Kushibiki, Tomonari Kamada, Shintaro Hinata, and Shin Saito | Japanese Journal of Applied Physics |
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Using Ru50Co25Cr25-oxide buffer layers with different melting points improves coercivity in CoPt-B2O3 granular media by enhancing intergranular decoupling. A TiO2-based buffer achieves high anisotropy field and small grain size, making it effective for granular magnetic media design. | Kim Kong Tham, Ryosuke Kushibiki, Tomonari Kamada, Shintaro Hinata, and Shin Saito | IEEE Transactions on Magnetics |
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A new rapid diagnostic kit capable of detecting adenovirus and respiratory syncytial virus (RSV) within 10 minutes was developed. Testing with PCR-positive samples demonstrated practical sensitivity levels, supporting its clinical applicability. | Thuy Phung, Huong Do, Hisahiko Iwamoto, Keita Suzuki, Dat Tran, and Kazuo Suzuki | ADC Letter for Infectious Disease Control |
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PdEr silicide was successfully formed on n-Si(100) using a PdEr alloy sputtering target, and its contact properties were evaluated for the first time. The PdEr silicide significantly reduced the electron Schottky barrier height and achieved low contact resistivity through a dopant segregation process, demonstrating its potential for low-resistance semiconductor contacts. | Shun-ichiro Ohmi, Yuya Tsukamoto, Weiguang Zuo, and Yasushi Masahiro | IEICE TRANSACTIONS on Electronics |
2017
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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Double-oxide grain boundary systems such as B2O3-TiO2 retain strong magnetic performance while reducing crystallite size in CoPt granular media. This combination supports finer microstructure and improved grain boundary engineering for high-density magnetic recording. | Ryosuke Kushibiki, Kim Kong Tham, Shintaro Hinata, and Shin Saito | AIP Advances |
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The melting point of single oxides strongly affects columnar growth and nucleation in CoPt granular media. High-melting-point oxides suppress lateral grain growth, enabling smaller grains and better microstructure control in magnetic recording materials. | Ryosuke Kushibiki, Kim Kong Tham, Shintaro Hinata, and Shin Saito | IEEE Transactions on Magnetics |
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Mechanism of soot oxidation over CeO2-ZrO2 under O2 flow
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The soot oxidation mechanism on CeO₂-ZrO₂ mixed oxides was clarified using TEM-based analysis, TG-DTA, and oxygen isotope techniques. The results show that soot oxidation proceeds at the soot-catalyst interface and is primarily driven by highly active CeO₂ lattice oxygen, which initiates oxidation more effectively than surface-adsorbed oxygen. | Hitoshi Kubo, Yusuke Oshima, Takeshi Yamashita, Shunji Kikuhara, Noriyuki Saitoh, Noriko Yoshizawa, Osamu Nakagoe, and Shuji Tanabe | Bulletin of the Chemical Society of Japan |
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Plating Machine for Semiconductor Wafer and the Future
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This review discusses advances in wafer plating equipment used in semiconductor manufacturing, focusing on uniformity, CUP-type systems, and stirrer design. It highlights current technology challenges and future development needs to improve plating performance and process consistency. | Hiroyuki Shoji | Journal of The Surface Finishing Society of Japan |
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A dual-function Ir catalyst was developed that operates as an anode for both hydrogenase-type fuel cells and photosystem II-inspired solar cells. | Mitsuhiro Kikkawa, Takeshi Yatabe, Takahiro Matsumoto, Ki-Seok Yoon, Kazuharu Suzuki, Takao Enomoto, Kenji Kaneko, and Seiji Ogo | ChemCatChem |
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Wafer-to-wafer transportable gold particle plug for spot vacuum sealing of MEMS
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A low-temperature spot vacuum sealing technique using thermo-compression bonding at 160 °C was developed with a transportable Au particle plug. The deformable sintered Au structure enables reliable hermetic sealing with high tolerance to surface irregularities, achieving cavity pressures below 100 Pa and ultra-low leak rates suitable for MEMS integration. | Toshinori Ogashiwa, Kentaro Totsu, Mitsutomo Nishizawa, Hiroyuki Ishida, Kenichi Inoue, Yuya Sasaki, Masayuki Miyairi, Shuji Tanaka, and Masayoshi Esashi | IEEE Xplore |
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Preparation of an Au-Pt alloy free from artifacts in magnetic resonance imaging
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Metallic implants can cause image artifacts during MRI, but metals remain essential for medical devices due to their conductivity and X-ray visibility. Material development is therefore focused on MRI-compatible metals that reduce artifacts without compromising performance. | Tomonobu Kodama, Ryusuke Nakai, Kenji Goto, Kunihiro Shima, and Hiroo Iwata | Magnetic Resonance Imaging |
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PdYb-Silicide with Low Schottky Barrier Height to n-Si Formed from Pd/Yb/Si(100) Stacked Structures
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We report for the first time that silicidation of a Pd/Yb stacked structure on a Si substrate forms PdYb silicide, which reduces the electron (Schottky) barrier height to as low as 0.4 eV. | Shun-ichiro Ohmi, Mengyi Chen, Weiguang Zuo, and Yasushi Masahiro | IEICE TRANSACTIONS on Electronics |
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An Origin for Lattice Expansion in PVP-Protected Small Pd Metal Nanoparticles
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EXAFS analysis was employed to investigate the origin of Pd-Pd bond elongation with decreasing particle size in PVP-stabilized Pd nanoparticles, revealing that the elongation is attributable to Pd-C bond formation. | Tadashi Ohba, Hitoshi Kubo, Yusuke Ohshima, Yuichi Makita, Noriaki Nakamura, Hiromitsu Uehara Satoru Takakusagi, and Kiyotaka Asakura | Bulletin of the Chemical Society of Japan |
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An Ir-containing Ni-based superalloy tool strengthened by γ′ precipitation demonstrated high durability and stable performance in friction stir spot welding of high-strength steel. The tool successfully produced defect-free spot welds in DP590 steel with minimal wear even after extended welding cycles, indicating strong potential for FSSW applications. | Kunihiro Tanaka, Tatsuya Nakazawa, Koichi Sakairi, Yutaka Sato, Hiroyuki Kokawa, Toshihiro Omori, and Kiyohito Ishida | Friction Stir Welding and Processing IX |
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Role of Hydrophobic Catalyst to Enhance Safety of Nuclear Fusion as a Future Energy Source
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The utilization of hydrophobic catalysts is discussed, with particular emphasis on hydrogen oxidation and isotope exchange reactions. | Yasunori Iwai, Yuki Edao, Hitoshi Kubo, and Yusuke Oshima | Catalysis Society of Japan |
2016
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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Low-melting-point oxides in Co80Pt20-oxide granular media promote columnar growth, phase separation, and reduced stacking faults, leading to higher magnetization and perpendicular anisotropy. Among them, CoPt-B2O3 delivers the best coercivity and fine grain isolation, making it attractive for granular magnetic media. | Kim Kong Tham, Shintaro Hinata, Ryosuke Kushibiki, and Shin Saito | Japanese Journal of Applied Physics |
2015
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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Surface topography control with CoCr-SiO2 buffer layers on Ru underlayers maintains the rough morphology needed for columnar growth in CoPt-SiO2 granular films. This underlayer design improves thermal resistance and sustains high perpendicular anisotropy, supporting magnetic recording media optimization. | Kim Kong Tham, Shintaro Hinata, Shin Saito and Migaku Takahashi | Journal of Applied Physics |
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In hcp Co80Pt20 films, underlayer roughness and grain size strongly influence compositionally modulated atomic stacking and uniaxial magnetocrystalline anisotropy. Smoother underlayers and larger grains promote the desired layered structure, providing a route to higher PMA in CoPt thin films. | Kim Kong Tham, Shintaro Hinata, and Shin Saito | IEEE Transactions on Magnetics |
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Research into organic semiconductor transistors in which contact electrodes are formed on organic semiconductors using a wet process. | M.Ito, U.Uno, J.Takeya | Organic Electronics |
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Research into organic semiconductor transistors in which contact electrodes are formed on organic semiconductors using a wet process. | S.Sakai, J.Soeda, R.Hausermann, H Matsui, C.Mitsui, T.Okamoto, M.Ito, K.Hirose, T.Sekiguchi, T.Abe, M.Uno, J.Takeya | Organic Electronics |
2014
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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High-temperature sputtering enables CoPt-SiO2 granular films with columnar grains, low stacking faults, and strong perpendicular magnetic anisotropy (PMA). A CoCr-SiO2/Ru underlayer preserves surface roughness and supports epitaxial grain growth, making this structure promising for granular magnetic media and high-density magnetic recording. | Kim Kong Tham, Shintaro Hinata, Shin Saito and Migaku Takahashi | Journal of Applied Physics |
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High Ku and low intergranular exchange coupling of postannealed CoPt-WO3 granular film
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Among post-annealed Co80Pt20-oxide and Co82.4Pt17.6-SiO2 granular films, CoPt-WO3 shows the highest coercivity because of strong grain isolation and weak intergranular exchange coupling. Annealing further enhances magnetocrystalline anisotropy by reducing stacking faults and improving lattice structure. | Kim Kong Tham, Shintaro Hinata, Shin Saito and Migaku Takahashi | IEEE Transactions on Magnetics |
2013
| Title | Summary | Authors (Bold: TANAKA employee) | Publication Name |
|---|---|---|---|
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High-performance solution-processed organic transistors with electroless-plated electrodes
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Research into organic semiconductor transistors in which contact electrodes are formed on organic semiconductors using a wet process. | M.Ito, T.Uemura, J.Soeda, J.Takeya | Organic Electronics |
Some listed authors are no longer with TANAKA. Their contributions were made during their tenure.