Kazu-masa Yamada

Significant enhancement of Rashba spin–orbit interaction using metastable heavy metal interface

Taishiro Yamazaki, Sora Obinata, Riku Iimori, Kazu-masa Yamada et autres

Spin–orbit torque (SOT) is a fundamental phenomenon in spintronics, facilitating efficient control of magnetic states in advanced device architectures. The discovery of a large spin Hall angle in metastable heavy metals has significantly enhanced the potential of SOT-based devices. However, the inherently …

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Evaluation of Hand Pose Techniques Numerical Teaching Materials of 5-Degree-of-Freedom with Camera Control

Kazu-masa Yamada, Théo Nadalini, Eiji Wada, T. Yamamoto et autres

There is a strong need for AI data science literacy education, which is a “reading, writing and calculating” and STEAM type of knowledge in the digital society, to further expand in the future. It is very important to provide educational materials that …

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Link between magnetism and resistivity upturn in cuprates: a thermal conductivity study of La$_{2-x}$Sr$_x$CuO$_4$

Patrick Bourgeois-Hope, S. Y. Li, F. Laliberté, S. Badoux et autres

A key unexplained feature of cuprate superconductors is the upturn in their normal state electrical resistivity $ρ(T)$ seen at low temperature inside the pseudogap phase. We examined this issue via measurements of the thermal conductivity $κ(T)$ down to 50 mK and in …

Link between magnetism and resistivity upturn in cuprates: a thermal conductivity study of La$_{2-x}$Sr$_x$CuO$_4$

Patrick Bourgeois-Hope, S. Y. Li, F. Laliberté, S. Badoux et autres

A key unexplained feature of cuprate superconductors is the upturn in their normal state electrical resistivity $\rho(T)$ seen at low temperature inside the pseudogap phase. We examined this issue via measurements of the thermal conductivity $\kappa(T)$ down to 50 mK and in …

Oyxgen Isotope Systematics of Porphyritic Chondrules and Their Fragments in CH and CB Chondrites

D. Nakashima, Makoto Kimura, Kazu-masa Yamada, Taka-aki K. Noguchi et autres

Temperature dependence of mobility of conducting polymer polyaniline with secondary dopant

Kazu-masa Yamada, Bunju Shinozaki, Takashi Narikiyo, Yousuke Takigawa et autres

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Temperature dependence of mobility of conducting polymer polyaniline with secondary dopant

Kazu-masa Yamada, Bunju Shinozaki, Takashi Narikiyo, Yousuke Takigawa et autres

The conductivity $σ$ and carrier density $n$ of the conducting polymer polyaniline were investigated by changing the concentration $x$ of a secondary dopant, meta-cresol. We found that $σ$ changes by four orders of magnitude within the $x$-range of 1-10 %, while $n$, …

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Self-identification algorithm for zeolite-based thermal capacity gas sensor

Mathieu Pouliquen, Matthieu Denoual, Corentin Jorel, Cosmin Radu et autres

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New Analytical Method of Interdiffusion Problems

Hiroki Cho, Kazu-masa Yamada, Takahisa Okino

The nonlinear diffusion equation for a binary system interdiffusion was analytically solved in the previous work. The theoretical relation of Kirkendall effect was also derived in the previous work. These new results have not yet been concretely applied to actual diffusion problems. …

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Fundamental Concept of Interdiffusion Problems

Takahisa Okino, Hiroki Cho, Kazu-masa Yamada

In accordance with the definition of diffusivity, the origin of coordinate system of the original diffusion equation is set at a point in the solvent material. Kirkendall revealed that Cu atoms, Zn atoms and vacancies move simultaneously in the interdiffusion region. This …

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100W C-band GaN solid state power amplifier with 50% PAE for satellite use

Mamoru Kido, Shigeo Kawasaki, A. Shibuya, Kazu-masa Yamada et autres

100W C-band gallium nitride solid state power amplifier (GaN SSPA) was developed for satellite use. GaN SSPA has already been applied to various fields such as ground stations and radar systems. Mitsubishi Electric TOKKI Systems (MELOS) had succeeded in developing 150W S-band …

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Nanostructural characterization of artificial pinning centers in PLD-processed REBa2Cu3O7-δ films

Takuya Maeda, Kenji Kaneko, Kazu-masa Yamada, Ahin Roy et autres

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