Development of measuring techniques for electric and magnetic states at buried interface in spintronics materials using hard X-ray photoelectron spectroscopy

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K12655
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 80040:Quantum beam science-related
• Research Institution: Japan Synchrotron Radiation Research Institute
• Principal Investigator: Yasui Akira 公益財団法人高輝度光科学研究センター, 分光推進室, 主幹研究員 (40455291)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 光電子分光 / 磁性材料 / スピントロニクス

Outline of Final Research Achievements

In this study, I aimed to establish an experimental method to analyze the electronic and magnetic states around magnetic layers in spintronic martials that govern its physical properties. For this purpose, I have developed a measurement technique of the hard X-ray photoelectron spectroscopy (HAXPES) under applied magnetic-field. HAXPES measurements with applying magnetic-field were tested for Cr/Co multilayer sample and I confirmed that the measurement was possible even at 200 mT. Two types of magnetic-field application mechanisms were developed, one using a permanent magnet and the other using an electromagnet. Both mechanisms are designed to raise the magnetic field at the measurement position up to 300 mT. We have also established a “resonant MCD-HAXPES” measurement technique to obtain a magnetic circular dichroism (MCD) of HAXPES spectrum while scanning the photon energy.

Free Research Field

放射光実験

Academic Significance and Societal Importance of the Research Achievements

次世代IT機器の基盤となるスピントロニクス材料の研究は盛んに行われている現在でも、物性を決定する磁性層界面での電子・磁気状態の理解は進んでいない。この詳細を調べることが可能である、磁場印加下での光電子分光技術を開発した。磁場印加下での光電子分光は磁場の影響で光電子自体の検出が困難であるため、これまで殆ど実施されていなかった。しかしながら、光電子が高エネルギーである硬X線光電子分光を用いることで、200 mT磁場印加下においても光電子分光測定が可能であることを示した。本研究は次世代IT 機器の開発研究の促進に寄与すると期待する。