Induced magnetism studied by magnetic spectroscopy under external field

• Project/Area Number: 24686007
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: The University of Tokyo
• Principal Investigator: OKABAYASHI Jun 東京大学, 理学(系)研究科(研究院), 准教授 (70361508)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥26,910,000 (Direct Cost: ¥20,700,000、Indirect Cost: ¥6,210,000); Fiscal Year 2013: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000); Fiscal Year 2012: ¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
• Keywords: 電子分光 / 磁気分光 / スピントロニクス / 界面 / 磁気円二色性 / 界面磁性 / 誘起磁性 / 軌道磁気モーメント / 結晶成長 / 外場印加 / 磁性体

Outline of Final Research Achievements

We have investigated the controllability of the exchange interaction by external fields in magnetic impurities and magnetic interfaces. We developed the new instruments for magnetic spectroscopy measuring the spin and orbital magnetic moments. We discussed two topics: (i) the doner-exchange interaction through the oxygen vacancies in magnetic oxide semiconductors and (ii) the mechanism of perpendicular magnetic anisotropy at the interface between ferromagnetic alloys and MgO. We found that the Fe-O chemical bonding becomes an essential role, which brings the control of anisotropy by the external fields.

Research Products

• [Journal Article] Perpendicular magnetic anisotropy at the interface between ultrathin Fe film and MgO studied by angular-dependent x-ray magnetic circular dichroism (2014)
  • Author(s): J. Okabayashi
  • Journal Title: Applied Physics Letters Volume: 105 Issue: 12 Pages: 1224081-5
  • DOI: 10.1063/1.4896290
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Large anisotropic Fe orbital moments in perpendicularly magnetized Co2FeAl Heusler alloy thin films revealed by angular-dependent x-ray magnetic circular dicroism (2013)
  • Author(s): J. Okabayashi, H. Sukegawa, Z. C. Wen, K. Inomata and S. Mitani
  • Journal Title: Appl. Phys. Lett. Volume: 103 Issue: 10 Pages: 1024021-4
  • DOI: 10.1063/1.4819915
  • Peer Reviewed
• [Presentation] Observation of perpendicular magnetization in Cu layer inserted between Co and Pt layers (2015)
  • Author(s): 岡林潤
  • Organizer: 応用物理学会
  • Place of Presentation: 東海大学
  • Year and Date: 2015-03-11 – 2015-03-14
• [Presentation] 内殻磁気円二色性を用いたFe/MgO界面における内殻磁気円二色性を用いたFe/MgO界面における (2015)
  • Author(s): 岡林潤
  • Organizer: 日本放射光学会
  • Place of Presentation: 立命館大学
  • Year and Date: 2015-01-10 – 2015-01-12
• [Presentation] Interface perpendicular magnetic anisotropy between ultrathin Fe film and MgO studied by x-ray magnetic circular dichroism (2014)
  • Author(s): 岡林潤
  • Organizer: 応用物理学会
  • Place of Presentation: 北海道大学
  • Year and Date: 2014-09-17 – 2014-09-20
• [Presentation] Large anisotropic Fe orbital moments in perpendicularly magnetized Co2FeAl Heusler alloy thin films revealed by angular-dependent x-ray magnetic circular dichroism (2014)
  • Author(s): J. Okabayashi
  • Organizer: 応用物理学会
  • Place of Presentation: 青山学院大学
• [Presentation] Large anisotropic Fe orbital moments in perpendicularly magnetized Co2FeAl Heusler alloy thin films revealed by angular-dependent x-ray magnetic circular dichroism (2014)
  • Author(s): J. Okabayashi
  • Organizer: 日本放射光学会
  • Place of Presentation: 広島国際会議場