2010 Fiscal Year Final Research Report
Fabrication of high-quality heterostructures with half-metallic ferromagnets and creation of spin tunneling devices
| Project/Area Number |
20246054
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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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ー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) |
2008 – 2010
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| Keywords | ハーフメタル / ホイスラー合金 / ヘテロ構造 / スピントロニクス / エピタキシャル成長 / MgOバリア / スピン依存トンネリング |
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| Research Abstract |
Heusler alloy thin films are promising as ferromagnetic electrode materials because they feature high spin polarization arising from their potentially half-metallic nature. High-quality heterostructures with Heusler alloy thin films were developed for device applications. Given these heterostructures, excellent devices characteristics were demonstrated for magnetic tunnel junctions. Furthermore, giant oscillations in spin-dependent tunneling resistances as a function of barrier thickness were found for fully epitaxial magnetic tunnel junctions with Heusler alloy Co2Cr0.6Fe0.4Al electrodes and a MgO barrier.
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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 (8pp)
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 (7pp)
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 (3pp)
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(CD-ROM)
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(CD-ROM)
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(CD-ROM)
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(CD-ROM)
Year and Date
2010-11-15
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[Presentation] Half-metallic electronic structure of Co_2MnSi electrodes proved by tunneling spectroscopy2008
Author(s)
石川貴之, 板橋直樹, 平智幸, 松田健一, 植村哲也, 山本眞史
Organizer
53_<rd> Magnetism and Magnetic Materials Conf., Abstracts, p.232, DD-07
Place of Presentation
Austin, TX, USA[Invited Talk](CD-ROM)
Year and Date
2008-12-12
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