Dynamic behaviour of electronic states of spintronics device during magnetization switching

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K04464
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21050:Electric and electronic materials-related
• Research Institution: Gunma University
• Principal Investigator: Sakurai Hiroshi 群馬大学, 大学院理工学府, 教授 (80251122)
• Co-Investigator(Kenkyū-buntansha): 高橋 学 群馬大学, 大学院理工学府, 教授 (50250816)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 磁気コンプトン散乱 / スピントロニクス / 磁歪 / 軌道磁化曲線 / スピン磁化曲線 / 磁気量子数別磁化曲線 / X線磁気円二色性

Outline of Final Research Achievements

We measured magnetic field dependence of X-ray magnetic circular dichroism (XMCD) spectra for CoFeB/MgO and CoFeB/Ta multilayers. Orbital specific magnetic hysteresis (OSMH) curves and spin specific magnetic hysteresis (SSMH) curves were obtained from magneto optical sum rule. The spin specific magnetic hysteresis curves were also obtained from magnetic Compton scattering (MCS). The spin specific magnetization curves by the XMCD agree with those by the MCS well. The magnetic switching behavior agree between the orbital magnetization and spin magnetization. We measured magnetic field dependence of the magnetostriction for the Fe/Co multilayers with nanostructure. The magnetic quantum number selective magnetic hysteresis curves are obtained from the analysis of the magnetic field dependence of MCS for the Fe/Co multilayers. Our results show that magnetic field dependences of the magnetostriction for the Fe/Co multilayers are dominated by the magnetic quantum number of |m|=2 states.

Free Research Field

電気電子材料

Academic Significance and Societal Importance of the Research Achievements

本研究により、磁気コンプトン散乱・X線磁気円二色性スペクトルの磁場依存性を解析することで、スピン磁化曲線・軌道磁化曲線・磁気量子数選択磁化曲線を測定する手法が開発された。開発された手法を用いて、磁化反転や磁歪などマクロな特性を支配する電子状態が明らかになってきた。これらの成果により、低消費電力で駆動するスピントロニクスデバイスの開発に資すると期待される。