Electronic states for magnetization switching behavior of magnetic tunneling junction with perpendicular magnetic anisotropy
Project/Area Number |
15K05978
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Electronic materials/Electric materials
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Research Institution | Gunma University |
Principal Investigator |
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Research Collaborator |
SUZUKI Kosuke 群馬大学, 大学院理工学府
SAKURAI Yoshiharu 高輝度光科学研究センター
ITOU Masayoshi 高輝度光科学研究センター
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Project Period (FY) |
2015-04-01 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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Keywords | スピントロニクス / スピン磁気モーメント / 軌道磁気モーメント / 磁気コンプトン散乱 / CoFeB / MgO / Ta / 磁気スイッチング / 磁気量子数 |
Outline of Final Research Achievements |
Recently, a CoFeB/MgO magnetic tunneling junction with Ta underlayer possessing perpendicular magnetic anisotropy are attracted. Therefore, electronic states in magnetization switching behavior at CoFeB/MgO and CoFeB/Ta interfaces were studied. A spin magnetic moment and orbital magnetic moment showed different magnetization switching behavior. The magnetization switching behavior of the orbital magnetic moment showed as if it had a perpendicular magnetic anisotropy. The magnetization switching behavior of the orbital magnetic moment was dominated by the states with magnetic quantum number |m|=2 for the CoFeB/MgO interface and |m|=1 for the CoFeB/Ta interface.
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Academic Significance and Societal Importance of the Research Achievements |
磁気ランダムアクセスメモリー(MRAM)は不揮発性・高速性・耐久性・低消費電力などから、スピントロニクスデバイスとして研究が進められている。一方、微細化に伴いセルサイズが小さくなると反磁化効果による書き込み電流の増大、熱擾乱など問題が指摘されている。一方、その反転プロセスにおける電子状態の研究は多くない。 本研究によって、スピン磁気モーメントと軌道磁気モーメント磁化反転挙動、磁化反転挙動に寄与する特定の対称性を有する電子状態が明らかにされた。これらは学術的に新しい進展である。さらに、本研究の進展によりスピントロニクスデバイスの駆動電流低減が図れると期待される。
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Report
(5 results)
Research Products
(83 results)
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[Journal Article] Visualizing redox orbitals and their potentials in advanced lithium-ion battery materials using high-resolution x-ray Compton scattering2017
Author(s)
Hasnain Hafiz, Kosuke Suzuki, Bernardo Barbiellini, Yuki Orikasa, Vincent Callewaert, Staszek Kaprzyk, Masayoshi Itou, Kentaro Yamamoto, Ryota Yamada, Yoshiharu Uchimoto,Yoshiharu Sakurai,Hiroshi Sakurai, Arun Bansil
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Journal Title
Sci. Adv.
Volume: 3
Issue: 8
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Spin density in YTiO3: I. Joint refinement of polarized neutron diffraction and magnetic x-ray diffraction data leading to insights into orbital ordering2017
Author(s)
I. A. Kibalin, Z. Yan, A. B. Voufack, S. Gueddida, B. Gillon, A. Gukasov, F. Porcher, A. M. Bataille, F. Morini, N. Claiser, M. Souhassou, C. Lecomte, J.-M. Gillet, M. Ito, K. Suzuki, H. Sakurai, Y. Sakurai, C. M. Hoffmann and X. P. Wang
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Journal Title
Phys. Rev. B
Volume: 96
Issue: 5
Pages: 054426-054426
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Non-destructive measurement of in-operando lithium concentration in batteries via x-ray Compton scattering2016
Author(s)
K. Suzuki, B. Barbiellini, Y. Orikasa, S. Kaprzyk, M. Itou, K. Yamamoto, Yung Jui Wang, H. Hafiz, Y. Uchimoto, A. Bansil, Y. Sakurai and H. Sakurai
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Journal Title
J. Appl. Phys.
Volume: 119
Issue: 2
Pages: 025103-025103
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Identifying a descriptor for d-orbital delocalization in cathords of Li batteries based on x-ray Compton scattering2016
Author(s)
B. Barbiellini, K. Suzuki, Y. Orikasa, S. Kaprzyk, M. Itou, K. Yamamoto, Yung Jui Wang, H. Hafiz, R. Yamada, Y. Uchimoto, A. Bansil, Y. Sakurai, and H. Sakurai
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Journal Title
Appl. Phys. Lett.
Volume: 109
Issue: 7
Pages: 0731021-4
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Presentation] 磁気コンプトンプロファイルによるLixMn2O4の電子構造,2019
Author(s)
鈴木宏輔, H. Hafiz, B. Barbiellini, 折笠有基, S. Kaprzyk, 辻成希, 山本健太郎, 寺阪歩, 星和志, 内本喜晴, 櫻井吉晴, A. Bansil
Organizer
第32回日本放射光学会年会・放射光合同シンポジウム
Related Report
Invited
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[Presentation] Ferrimagnetic Anomaly in LixMn2O4 Positive Electrode Material Observed by Magnetic Compton Scattering2018
Author(s)
K. Suzuki, H. Hafiz, B. Bernardo, Y. Orikasa, S. Kaprzyk, N. Tsuji, K. Yamamoto, A. Terasaka, K. Hoshi, Y. Uchimoto, Y. Sakurai, A. Bansil and H. Sakurai
Organizer
5th International Symposium of Gunma Univeristy Medical Innovation and 9th International Conference on Advanced Micro-Device Engineering
Related Report
Int'l Joint Research
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[Presentation] Strongly Correlated Electronic Structure in Battery Materials Studied by Compton Scattering Spectroscopy2017
Author(s)
K. Suzuki, B. Barbiellini, H. Hafiz, R. Yamada, Y. Orikasa, V. Callewaert, S. Kaprzyk, M. Itou, K. Yamamoto, Y. J. Wang, Y. Uchimoto, A. Bansil, Y. Sakurai, and H. Sakurai
Organizer
7th Annual World Congress of Nano Science and Technology 2017
Related Report
Int'l Joint Research
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[Presentation] ハーフホイスラー Co1-xCuxMnSb合金の電子状態2017
Author(s)
Kishor Kumar, Alpa Dashora, N. L. Heda, B.L. Ahuja, H. Sakurai, N. Tsuji, M. Itou, Y. Sakurai
Organizer
第4回 実用スピントロニクス新分野創成研究会
Place of Presentation
名古屋工業大学
Related Report
Int'l Joint Research
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[Presentation] Electrode and Electrochemical Reactions Observed by Compton Scattering Spectroscopy2016
Author(s)
Kosuke Suzuki,Bernardo Ballbierini, Yuki Orikasa, Taiki Ishikawa, Ayahito Suzuki, Ryota Yamada, Hiroshi Sakurai, Stanishaw Kaprzyk,Masayoshi Ito, Kentarou Yamamoto, Yung Jui Wang, Hasnain Hafiz, Yoshiharu Uchimoto, Arun Bansil, and Yoshiharu Sakurai
Organizer
EMN(Energy, Material and Nanotechnology) Meeting on Batteries 2016
Place of Presentation
Florida, USA
Year and Date
2016-02-21
Related Report
Int'l Joint Research / Invited
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[Presentation] Non-Destructive Measurement of in-operando Lithium Concentration in Batteries via X-ray Compton Scattering2015
Author(s)
K. Suzuki, B. Barbiellini, Y. Orikasa, S. Kaprzyk, M. Itou, K. Yamamoto, Yung Jui Wang, H. Hafiz, Y. Uchimoto, A. Bansil, Y. Sakurai, and H. Sakurai
Organizer
IXS2015; The 9th International Conference on Inelastic X-ray Scattering
Place of Presentation
Hsinchu, Taiwan
Year and Date
2015-11-22
Related Report
Int'l Joint Research
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[Presentation] Redox orbital with Lithium intercalation in LixMn2O4 and LixCoO22015
Author(s)
H. Sakurai, K. Suzuki, B. Barbiellini, Y. Orikasa, N. Go, S. Kaprzyk, M. Itou, K. Yamamoto, Y. Uchimoto, Yung Jui Wang, H. Hafiz, A. Bansil, and Y. Sakurai
Organizer
SAGAMORE XVIII Conference on Charge, Spin and Momentum Densities
Place of Presentation
Sardinia, Italy
Year and Date
2015-06-07
Related Report
Int'l Joint Research / Invited
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[Presentation] Extracting the Redox Orbitals in Li Battery Materials with High-Resolution X-Ray Compton Scattering Spectroscopy2015
Author(s)
2015 MRS Spring Meeting & Exhibit
Organizer
K. Suzuki, B. Barbiellini, Y. Orikasa, N. Go, H. Sakurai, S. Kaprzyk, M. Itou, K. Yamamoto, Y. Uchimoto, Yung Jui Wang, H. Hafiz, A. Bansil and Y. Sakurai
Place of Presentation
San Francisco, California, USA
Year and Date
2015-04-06
Related Report
Int'l Joint Research
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[Book] 放射光利用の手引き2019
Author(s)
東北放射光施設推進会議推進室
Total Pages
344
Publisher
アグネ技術センター
ISBN
9784901496957
Related Report
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