2010 Fiscal Year Final Research Report
Exploration and creation of highly efficient spin sources using half-metallic ferromagnets
| Project Area | Creation and control of spin current |
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| Project/Area Number |
19048001
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
YAMAMOTO Masafumi Hokkaido University, 大学院・情報科学研究科, 教授 (10322835)
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| Co-Investigator(Kenkyū-buntansha) |
TETSUYA Uemura 北海道大学, 大学院・情報科学研究科, 准教授 (20344476)
MATSUDA Ken-ichi 北海道大学, 大学院・情報科学研究科, 助教 (80360931)
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| Project Period (FY) |
2007 – 2010
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| Keywords | スピン源 / ハーフメタル / ホイスラー合金 / スピントロニクス / スピン偏極率 |
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| Research Abstract |
A highly efficient spin-polarized electron source or spin source is a key element for spintronic devices, in which both the charge and the spin of the electron are utilized as the information carrier. Heusler alloys thin films have attracted much interest as spin sources because of the half-metallic nature theoretically predicted for many of these alloys. It was found that detrimental defects can be reduced by appropriately controlling the film composition of Heusler alloys. It was also shown that the suppression of detrimental defects led to a significant enhancement of the half-metallic nature of Heusler alloy thin films in device structures. Excellent device characteristics were demonstrated for fabricated magnetic tunnel junctions with Heusler alloy electrodes and a MgO barrier by improving the interfacial structures in addition to the above-mentioned enhancement of the half-metallic nature.
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[Journal Article] Magnetic states of Mn and Co atoms at Co_2MnGe/MgO interfaces seen via soft x-ray magnetic circular dichroism2010
Author(s)
D.Asakura, T.Koide, S.Yamamoto, K.Tsuchiya, T.Shioya, K.Amemiya, V.R.Singh, T.Kataoka, Y.Yamazaki, Y.Sakamoto, A.Fujimori, T.Taira, M.Yamamoto
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Journal Title
Phys. Rev. B vol.82
Pages: 184419(8)
Peer Reviewed
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[Journal Article] Hard X-ray photoelectron spectroscopy of buried Heusler compounds2009
Author(s)
S.Ouardi, B.Balke, A.Gloskovskii, G.H Fecher, C.Felser, G.Schoenhense, T.Ishikawa, T.Uemura, M.Yamamoto, H.Sukegawa, W.-H.Wang, K.Inomata, Y.Yamashita, H.Yoshikawa, S.Ueda, K.Kobayashi
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Journal Title
J. Phys. D : Applied Phys. vol.42
Pages: 084010(7)
Peer Reviewed
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[Journal Article] Detection of the valence band in buried Co_2MnSi-MgO tunnel junctions by means of photoemission spectroscopy2008
Author(s)
G.H.Fecher, B.Balke, A.Gloskowskii, S.Ouardi, C.Felser, T.Ishikawa, M.Yamamoto, Y.Yamashita, H.Yoshikawa, S.Ueda, K.Kobayashi
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Journal Title
Appl. Phys. Lett. vol.92
Pages: 193513(3)
Peer Reviewed
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[Presentation] Highly spin-polarized tunneling characteristics at room temperature in magnetic tunnel junctions with a half-metallic Heusler-alloy spin source and a MgO barrier2010
Author(s)
H.-x.Liu, T.Taira, Y.Honda, K.-i.Matsuda, T.Uemura, M.Yamamoto
Organizer
55th Annual Conf. on Magnetism & Magnetic Materials, Abstracts, pp. 370-371, ET-11
Place of Presentation
Atlanta, Georgia, USA
Year and Date
2010-11-17
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[Presentation] Giant oscillations of spin-dependent tunneling resistances as a function of MgO barrier thickness in fully epitaxial magnetic tunnel junctions of Co_2Cr_<0.6>Fe_<0.4>Al/MgO/Co_2Cr_<0.6>Fe_<0.4>Al2010
Author(s)
M.Yamamoto, T.Marukame, T.Ishikawa, T.Taira, K.-i.Matsuda, T.Uemura
Organizer
55th Annual Conf. on Magnetism & Magnetic Materials, Abstracts, p. 165, CB-01
Place of Presentation
Atlanta, Georgia, USA
Year and Date
2010-11-16
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[Presentation] Structural and magnetic properties at Co_2MnSi/MgO(001) interfaces studied by x-ray magnetic circular dichroism and first-principles calculations2010
Author(s)
Y.Miura, M.Shirai, T.Saito, T.Katayama, T.Ishikawa, M.Yamamoto, D.Asakura, T.Koide
Organizer
55th Annual Conf. on Magnetism & Magnetic Materials, Abstracts, p. 165, CB-02
Place of Presentation
Atlanta, Georgia, USA
Year and Date
2010-11-16
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[Presentation] Giant tunnel magnetoresistance in half-metallic Co_2MnSi-based fully epitaxial magnetic tunnel junctions2010
Author(s)
T.Taira, H.-x.Liu, S.Hirata, K.-i.Matsuda, T.Uemura, M.Yamamoto
Organizer
55th Annual Conf. on Magnetism & Magnetic Materials, Abstracts, pp. 118-119, BH-10
Place of Presentation
Atlanta, Georgia, USA
Year and Date
2010-11-15
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[Presentation] ホイスラー合金によるスピン流の創出と制御2010
Author(s)
植村哲也, 石川貴之, 原田雅亘, 平智幸, 松田健一, 山本眞史
Organizer
2010年(平成22年)春期第146回日本金属学会講演会講演概要p.156(S6.17)(基調講演)
Place of Presentation
つくば市,筑波大学
Year and Date
2010-03-30
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[Presentation] Half-metallic electronic structure of Co_2MnSi electrodes proved by tunneling spectroscopy2008
Author(s)
T.Ishikawa, N.Itabashi, T.Taira, K.-i.Matsuda, T.Uemura, M.Yamamoto
Organizer
53rd Magnetism and Magnetic Materials Conf., Abstracts, p. 232, DD-07[Invited Talk]
Place of Presentation
Austin, TX, USA
Year and Date
2008-11-12
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