Index Catalog // MDR

Description/Abstract:: GaN has attracted attention as a semiconductor material for next-generation power switching devices. Vertical-type GaN devices with MOS g...
Keyword:: atom probe tomography, gallium nitride, and transmission electron microscopy
Resource Type:: ProceedingsArticle
Author:: Ryo Tanaka, Shinya Takashima, Katsunori Ueno, Masahiro Horita, Jun Suda, Jun Uzuhashi, Tadakatsu Ohkubo, and Masaharu Edo
Date Uploaded:: 19/04/2024

Description/Abstract:: The nanocrystalline structure and soft magnetic properties of melt-spun Fe-B-P-Cu ribbons are largely influenced by heating rates for cry...
Keyword:: atom probe tomography
Resource Type:: Article
Author:: Yohei Nomura, Jun Uzuhashi, Tatsuya Tomita, Toru Takahashi, Hidenori Kuwata, Taichi Abe, Tadakatsu Ohkubo, and Kazuhiro Hono
Journal:: Journal of Alloys and Compounds
Date Uploaded:: 29/03/2024

Description/Abstract:: We investigated the influence of the buffer material and a cryogenic temperature deposition process on the voltage-controlled magnetic an...
Keyword:: Spintronics
Resource Type:: Article
Author:: Takayuki Nozaki, Tomohiro Ichinose, Jun Uzuhashi, Tatsuya Yamamoto, Makoto Konoto, Kay Yakushiji, Tadakatsu Ohkubo, and Shinji Yuasa
Journal:: APL Materials
Date Uploaded:: 10/01/2024

Description/Abstract:: Ni-base superalloys are known for their high temperature oxidation resistance, however, impurity of S at ppm order can significantly dec...
Keyword:: Ni-base superalloy, oxidation resistance, and sulfur segregation
Resource Type:: Article
Author:: Chihiro Tabata, Kyoko Kawagishi, Tadaharu Yokokawa, Jun Uzuhashi, Tadakatsu Ohkubo, Hiroshi Harada, and Shinsuke Suzuki
Journal:: METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Date Uploaded:: 05/01/2024

Description/Abstract:: The utilization of orbital transport provides a versatile and efficient spin manipulation mechanism. As interest in orbital-mediated spin...
Keyword:: spintronics
Resource Type:: Article
Author:: Junyeon Kim, Jun Uzuhashi, Masafumi Horio, Tomoaki Senoo, Dongwook Go, Daegeun Jo, Toshihide Sumi, Tetsuya Wada, Iwao Matsuda, Tadakatsu Ohkubo, Seiji Mitani, Hyun-Woo Lee, and YoshiChika Otani
Journal:: Physical Review Materials
Date Uploaded:: 01/12/2023
Date Modified:: 01/12/2023

Description/Abstract:: The compositional and structural investigations of threading dislocations (TDs) in InGaN/GaN multiple quantum wells were carried out usin...
Keyword:: InGaN, atom probe tomography, dislocation, pipe diffusion, and transmission electron microscopy
Resource Type:: Article
Author:: Yudai Yamaguchi, Yuya Kanitani, Yoshihiro Kudo, Jun Uzuhashi, Tadakatsu Ohkubo, Kazuhiro Hono, and Shigetaka Tomiya
Journal:: NANO LETTERS
Date Uploaded:: 04/10/2023
Date Modified:: 04/10/2023

Description/Abstract:: We study the magnetic and electrical transport properties of magnetic tunnel junctions (MTJs) consisting of a Co3Mn/Mo/CoFeB multilayer p...
Keyword:: energy dispersive X-ray spectrometry, magnetic tunnel junctions, nanobeam electron diffraction, and scanning transmission electron microscopy
Resource Type:: Article
Author:: Tatsuya Yamamoto, Tomohiro Ichinose, Jun Uzuhashi, Takayuki Nozaki, Tadakatsu Ohkubo, Kay Yakushiji, Shingo Tamaru, and Shinji Yuasa
Journal:: Physical Review Applied
Date Uploaded:: 03/10/2023
Date Modified:: 05/10/2023

Description/Abstract:: We used atomic-scale direct observations by transmission electron microscopy (TEM) and atom probe tomography to clarify the crystallograp...
Keyword:: atom probe tomography, gallium nitride, and transmission electron microscopy
Resource Type:: Article
Author:: Emi Kano, Keita Kataoka, Jun Uzuhashi, Kenta Chokawa, Hideki Sakurai, Akira Uedono, Tetsuo Narita, Kacper Sierakowski, Michal Bockowski, Ritsuo Otsuki, Koki Kobayashi, Yuta Itoh, Masahiro Nagao, Tadakatsu Ohkubo, Kazuhiro Hono, Jun Suda, Tetsu Kachi, and Nobuyuki Ikarashi
Journal:: JOURNAL OF APPLIED PHYSICS
Date Uploaded:: 28/09/2023
Date Modified:: 28/09/2023

Description/Abstract:: Here, we investigate the effects of O2:N2 (1:1) as ambient gas as compared with pure N2 during activation annealing of Mg as p-type dopin...
Keyword:: activation, gallium nitride, scanning transmission electron microscopy, and semiconductor
Resource Type:: Article
Author:: Ashutosh Kumar, Martin Berg, Qin Wang, Jun Uzuhashi, Tadakatsu Ohkubo, Michael Salter, and Peter Ramvall
Journal:: JOURNAL OF APPLIED PHYSICS
Date Uploaded:: 28/09/2023
Date Modified:: 28/09/2023

Description/Abstract:: An area selective doping via ion implantation is a key technology to realize gallium nitride (GaN) based energy-efficient power devices; ...
Keyword:: atom probe tomography, cathodoluminescence, gallium nitride, implantation, and scanning transmission electron microscopy
Resource Type:: Article
Author:: Jun Uzuhashi, Jun Chen, Ashutosh Kumar, Wei Yi, Tadakatsu Ohkubo, Ryo Tanaka, Shinya Takashima, Masaharu Edo, Kacper Sierakowski, Michal Bockowski, Hideki Sakurai, Tetsu Kachi, Takashi Sekiguchi, and Kazuhiro Hono
Journal:: JOURNAL OF APPLIED PHYSICS
Date Uploaded:: 04/07/2023

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