Manipulation of orbital magnetic moments probed by x-ray magnetic spectroscopy under external fields

• Project/Area Number: 15H03562
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: The University of Tokyo
• Principal Investigator: Okabayashi Jun 東京大学, 大学院理学系研究科(理学部), 准教授 (70361508)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000); Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2016: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000); Fiscal Year 2015: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
• Keywords: 電子分光 / 磁気分光 / 軌道磁気モーメント / 界面 / Ｘ線磁気円二色性 / 外場摂動 / スピンオービトロニクス / 磁気円二色性 / スピントロニクス

Outline of Final Research Achievements

We have investigated precise measurements of orbital magnetic moments at the interfaces. We developed novel x-ray magnetic spectrometry which enables the measurements under external fields. We clarified the mechanism of perpendicular magnetic anisotropy in Co/Pd interface and we succeeded in the detection of perpendicular magnetism in non-magnetic Cu. Further, we succeeded in the manipulation of orbital moments in strained Ni under external electric fields. These results contribute to the novel researches of spin-orbitronics.

Research Products

• [Journal Article] Interfacial exchange coupling between transition metals and Mn1.5Ga studied by X-ray magnetic circular dichroism (2018)
  • Author(s): J. Okabayashi, K.Z. Suzuki and S. Mizukami
  • Journal Title: J. Magn. Magn. Mater. Volume: 460 Pages: 418-423
  • DOI: 10.1016/j.jmmm.2018.03.060
  • Peer Reviewed
• [Journal Article] Structural and magnetic properties of epitaxial thin films of the equiatomic quaternary CoFeMnSi Heusler alloy (2017)
  • Author(s): Lakhan Bainsla, Resul Yilgin, Jun Okabayashi, Atsuo Ono, Kazuya Suzuki, and Shigemi Mizukami
  • Journal Title: Physical Review B Volume: 96 Issue: 9 Pages: 0944041-7
  • DOI: 10.1103/physrevb.96.094404
  • Peer Reviewed
• [Journal Article] Detection of induced paramagnetic moments in Pt on Y3Fe5O12 via x-ray magnetic circular dichroism (2017)
  • Author(s): Kikkawa Takashi、Suzuki Motohiro、Okabayashi Jun、Uchida Ken-ichi、Kikuchi Daisuke、Qiu Zhiyong、Saitoh Eiji
  • Journal Title: Physical Review B Volume: 95 Issue: 21 Pages: 2144161-7
  • DOI: 10.1103/physrevb.95.214416
  • Peer Reviewed
• [Journal Article] Pressure-induced two-step spin crossover in a double-layered elastic model (2017)
  • Author(s): Taniguchi Daisuke、Okabayashi Jun、Hotta Chisa
  • Journal Title: Physical Review B Volume: 96 Issue: 17 Pages: 174104-174104
  • DOI: 10.1103/physrevb.96.174104
  • Peer Reviewed
• [Journal Article] Induced perpendicular magnetization in a Cu layer inserted between Co and Pt layers revealed by x-ray magnetic circular dichroism (2017)
  • Author(s): J. Okabayashi et al.
  • Journal Title: Scientific Reports Volume: 7 Issue: 1 Pages: 461321-9
  • DOI: 10.1038/srep46132
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Interdiffusion in epitaxial ultrathin Co2FeAl/MgO heterostructures with interface-induced perpendicular magnetic anisotropy (2016)
  • Author(s): Zhenchao Wen, Jason Paul Hadorn, Jun Okabayashi, Hiroaki Sukegawa, Tadakatsu Ohkubo, Koichiro Inomata, Seiji Mitani, and Kazuhiro Hono
  • Journal Title: Zhenchao Wen, Jason Paul Hadorn, Jun Okabayashi, Hiroaki Sukegawa, Tadakatsu Ohkubo, Koichiro Inomata, Seiji Mitani, and Kazuhiro Hono Volume: 10 Issue: 1 Pages: 013003-013003
  • DOI: 10.7567/apex.10.013003
  • NAID: 210000135725
  • Peer Reviewed
• [Journal Article] Perpendicular magnetic tunnel junction with a strained Mn-based nanolayer (2016)
  • Author(s): K. Z. Suzuki, R. Ranjbar, J. Okabayashi, Y. Miura, A. Sugihara, H. Tsuchiura and S. Mizukami
  • Journal Title: Scientific Reports Volume: 6 Issue: 1 Pages: 30249-30249
  • DOI: 10.1038/srep30249
  • Peer Reviewed / Open Access
• [Presentation] 強的3d2系(V3+)スピネル型酸化物における強的・反強的な軌道秩序 (2018)
  • Author(s): 岡林潤
  • Organizer: 強的秩序のその操作に関する研究会
• [Presentation] メスバウアー様々な磁気分光手法による四極子相互作用に関する考察 (2018)
  • Author(s): 岡林潤
  • Organizer: 放射光メスバウアー分光研究会
• [Presentation] 元素別なスピンと軌道磁気モーメントの観測と操作 (2018)
  • Author(s): 岡林潤
  • Organizer: 電気学会
  • Invited
• [Presentation] Ni/Cu多層構造の電場誘起XMCD (2017)
  • Author(s): 岡林潤
  • Organizer: 日本放射光学会
  • Place of Presentation: 神戸国際会議場（兵庫県神戸市）
  • Year and Date: 2017-01-08
• [Presentation] 磁気学会非磁性体界面に誘起される軌道磁性 (2017)
  • Author(s): 岡林潤
  • Organizer: 日本磁気学会専門研究会
  • Invited
• [Presentation] Tailoring spin and orbital in complexed materials probed by x-ray magnetic spectroscopy (2017)
  • Author(s): Jun Okabayashi
  • Organizer: CCMR2017
  • Int'l Joint Research / Invited
• [Presentation] Perpendicular magnetic anisotropy of an Fe/MgO interface induced by W buffer and Tb cap layers (2017)
  • Author(s): Yuki Iida, Jun Okabayashi, and Seiji Mitani
  • Organizer: TMRC2017
  • Int'l Joint Research
• [Presentation] Relationship between Strain and Orbital Magnetic Moments in Ni/Cu Multilayers Studied by Electric-Field-Induced XMCD and First-Principle Calculation (2017)
  • Author(s): Jun Okabayashi and Tomoyasu Taniyama
  • Organizer: 応用物理学会
• [Presentation] Perpendicular magnetic anisotropy of polycrystalline Fe/MgO interfaces induced by W buffer and Tb capping layers (2017)
  • Author(s): Yuki Iida, Jun Okabayashi, and Seiji Mitani
  • Organizer: 応用物理学会
• [Presentation] Enhancement of tunnel magnetoresistance and perpendicular magnetic anisotropy in magnetic tunnel junctions with Mn-modified MnGa electrodes (2017)
  • Author(s): K.Z. Suzuki, J. Okabayashi et al.
  • Organizer: 応用物理学会
• [Presentation] 磁気Ni/Cu多層構造の電場誘起XMCD (2017)
  • Author(s): 岡林潤
  • Organizer: 日本磁気学会
• [Presentation] Relationship between Strain and Orbital Magnetic Moments in Ni/Cu Multilayers Studied by Electric-Field-Induced XMCD and First-Principle Calculation (2017)
  • Author(s): Jun Okabayashi
  • Organizer: Kanamori Symposium
  • Int'l Joint Research
• [Presentation] Manipulating Orbital Magnetic Moments at Film Interfaces (2017)
  • Author(s): Jun Okabayashi
  • Organizer: 原研セミナー
• [Presentation] Structural ordering and magnetism in equiatomic CoFeMnSi epitaxial films (2017)
  • Author(s): Lakan Balinska, J. Okabayashi et al,
  • Organizer: SSDM
  • Int'l Joint Research
• [Presentation] Relationship between degree of order and magnetic moments in equiatomic quaternary CoFeMnSi Heusler alloy studied by XMCD (2017)
  • Author(s): Jun Okabayashi et al.
  • Organizer: PASPS22
• [Presentation] Enhancement of tunnel magnetoresistance and perpendicular magnetic anisotropy in magnetic tunnel junctions with Mn-modified MnGa electrodes (2017)
  • Author(s): K.Z. Suzuki, J. Okabyaashi et al.
  • Organizer: 応用物理学会
• [Presentation] Anatomy of interfacial spin-orbit coupling in Co/Pd multilayers by XMCD and band-structure calculation (2017)
  • Author(s): Jun Okabayashi
  • Organizer: 応用物理学会
  • Place of Presentation: パシフィコ横浜（神奈川県横浜市）
• [Presentation] Co L-edge and Pd M-edge XMCD in perpendicular magnetic anisotropy system：Co/Pd multilayers (2016)
  • Author(s): Jun Okabayashi
  • Organizer: Mag. Mag. Mater.
  • Place of Presentation: New Orleans (USA)
  • Year and Date: 2016-11-03
  • Int'l Joint Research
• [Presentation] Interfacial Exchange Coupling in FeCo/MnGa Studied by X-ray Magnetic Circular Dichroism (2016)
  • Author(s): Jun Okabayashi
  • Organizer: Mag. Mag. Mater.
  • Place of Presentation: New Orleans (USA)
  • Year and Date: 2016-11-03
  • Int'l Joint Research
• [Presentation] Element-Specific Characterization in Spin-Orbit-Coupled Interfaces Using X-Ray Magnetic Circular Dichroism (XMCD) (2016)
  • Author(s): Jun Okabayashi
  • Organizer: Solid State Chemitry 2016
  • Place of Presentation: Prague (Czech Republic)
  • Year and Date: 2016-09-16
  • Invited
• [Presentation] Interfacial Exchange Coupling between Transition Metal and MnGa Studied by X-ray Magnetic Circular Dichroism (2016)
  • Author(s): Jun Okabayashi
  • Organizer: 応用物理学会
  • Place of Presentation: 朱鷺メッセ（新潟県新潟市）
  • Year and Date: 2016-09-12
• [Presentation] Co/Pd多層構造の元素別軌道磁気モーメントの異方性 (2016)
  • Author(s): 岡林潤
  • Organizer: 日本磁気学会
  • Place of Presentation: 金沢大学（石川県金沢市）
  • Year and Date: 2016-09-07
• [Presentation] Manipulating Orbital Magnetic Moments Probed by X-ray Magnetic Circular Dichroism (2016)
  • Author(s): Jun Okabayashi
  • Organizer: IEEE distinguished lectures
  • Place of Presentation: 日本大学（東京都千代田区）
  • Invited
• [Remarks] 東京大学大学院理学系研究科スペクトル化学研究センター
  • URL: http://www.chem.s.u-tokyo.ac.jp/users/spectrum/index.html