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2022 Fiscal Year Final Research Report

Spin-orbit torque induced magnetization switching using Wyle semimetals and its device application

Research Project

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Project/Area Number 20H02174
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 21050:Electric and electronic materials-related
Research InstitutionHokkaido University

Principal Investigator

Uemura Tetsuya  北海道大学, 情報科学研究院, 教授 (20344476)

Co-Investigator(Kenkyū-buntansha) 近藤 憲治  北海道大学, 電子科学研究所, 准教授 (50360946)
Project Period (FY) 2020-04-01 – 2023-03-31
Keywords磁性ワイル半金属 / スピン軌道相互作用 / スピン軌道トルク / 強磁性トンネル接合
Outline of Final Research Achievements

The purpose of this study are to clarify the physics of spin-orbit torque induced by a spin current generated in Wyle semimetals with strong spin orbit interaction, and to develop a basic technology to realize spintronic devices with high-speed and low power consumption. To do this, we investigated the anomalous Hall effect in Co-based Heusler alloys, such as Co2MnAl and Co2MnGa, which are theoretically predicted to be Wyle semimetals, and demonstrated the SOT-induced magnetization switching of perpendicularly magnetized CoFeB thin film with no external magnetic field.

Free Research Field

電気電子工学

Academic Significance and Societal Importance of the Research Achievements

ワイル半金属はトポロジカル絶縁体とともに,物性物理学において近年大きな注目を集めているが,その研究対象はフェルミ面におけるワイル点の観測などの物性探索が主であり,デバイス応用の研究は極めて少ない.本研究の進展により,これまでに多くの研究がなされてきたスピントロニクスデバイスにおいて,ワイル半金属の有効性を示すことができ,トポロジカル材料を利用したスピントロニクスデバイスの創生という新たな流れを創出することに貢献できる.

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Published: 2024-01-30  

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