Characterization of high spin polarization materials using soft x-ray magnetic circular dichroism and soft x-ray scattering
Project Area | Creation and control of spin current |
Project/Area Number |
19048012
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Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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Allocation Type | Single-year Grants |
Review Section |
Science and Engineering
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Research Institution | The University of Tokyo |
Principal Investigator |
FUJIMORI Atsushi The University of Tokyo, 大学院・理学系研究科, 教授 (10209108)
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Co-Investigator(Kenkyū-buntansha) |
小出 常晴 大学共同利用機関法人・高エネルギー加速器研究機構, 物質構造科学研究所, 准教授 (10150012)
竹田 幸治 独立行政法人日本原子力開発機構, 量子ビーム応用研究部門, 研究副主幹 (50399416)
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Project Period (FY) |
2007 – 2010
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Project Status |
Completed (Fiscal Year 2010)
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Budget Amount *help |
¥30,600,000 (Direct Cost: ¥30,600,000)
Fiscal Year 2010: ¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 2009: ¥8,500,000 (Direct Cost: ¥8,500,000)
Fiscal Year 2008: ¥8,500,000 (Direct Cost: ¥8,500,000)
Fiscal Year 2007: ¥6,800,000 (Direct Cost: ¥6,800,000)
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Keywords | 磁性半導体 / 超構造 / 軟X線磁気円二色性 / 光電子分光 / 軟X線共鳴散乱 |
Research Abstract |
We have studied the local atomic, electronic, and magnetic structures of magnetic semiconductors, Heusler alloys, and their interfaces using soft x-ray magnetic circular dichroism in an element specific manner. Major achievements are : =-In the prototypical diluted magnetic semiconductor Ga_<1-x>Mn_xAs, antiferromagnetic interaction between substitutional and interstitial Mn atoms has been found, indicating the necessity of removing interstitial Mn to improve the ferromagnetism. =-For the room-temperature ferromagnetic semiconductor Ti_<1-x>Co_xO_2, clear correlation has been found between the Co magnetic moment and the electrical conductivity, strongly favoring scenarios of carrier-induced ferromagnetism. -Substitution studies of the high-temperature ferromagnetic semiconductor Zn_<1-x>Cr_xTe has revealed that the Cr^<2+> valence state is necessary for ferromagnetism, favoring the spinodal decomposition theory of ferromagnetism.
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Report
(6 results)
Research Products
(114 results)
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[Journal Article] Bulk and surface magnetization of Co atoms in rutile Ti^<1-x>Co xO <2-δ> thin films revealed by x-ray magnetic circular dichroism2011
Author(s)
V.R.Singh, Y.Sakamoto, T.Kataoka, M.Kobayashi, Y.Yamazaki, A.Fujimori, F.-H.Chang, D.-J.Huang, H.-J.Lin, C.T.Chen, H.Toyosaki, T.Fukumura, M.Kawasaki
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[Journal Article] Antiferromagnetic interaction between paramagnetic Co ions in the diluted magnetic semiconductor Zn^<1-x>Co xO2010
Author(s)
M.Kobayashi.Y.Ishida, J.I.Hwang, Y.Osafune, A.Fujimori, Y.Takeda, T.Okane, Y.Saitoh, K.Kobayashi, H.Saeki, T.Kawai, H.Tabata
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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 dichroism study2010
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 Article] Electronic Structure and Magnetism of the Diluted Magnetic Semiconductor Fe-Doped ZnO Nano-Particles2010
Author(s)
T. Kataoka, M. Kobayashi, Y. Sakamoto, G.S. Song, A. Fujimori, F.-H. Chang, H.-J. Lin, D.J. Huang, C.T. Chen, T. Ohkochi, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, A. Tanaka, S.K. Mandal, T.K. Nath, D. Karmakar, I. Dasgupta
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Journal Title
NAID
Related Report
Peer Reviewed
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[Journal Article] Antiferromagnetic Interaction between Paramagnetic Co Ions in the Diluted Magnetic Semiconductor Zn1-xCoxO2010
Author(s)
M. Kobayashi. Y. Ishida, J.I. Hwang, Y. Osafune, A. Fujimori, Y. Takeda, T. Okane, Y. Saitoh, K. Kobayashi, H. Saeki, T. Kawai, H. Tabata
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[Journal Article] Nature of magnetic coupling between Mn ions in as-grown Ga^<1-x>Mn xAs studied by x-ray magnetic circular dichroism2008
Author(s)
Y.Takeda, M.Kobayashi, T.Okane, T.Ohkochi, J.Okamoto, Y.Saitoh, K.Kobayashi, H.Yamagami, A.Fujimori, A.Tanaka, J.Okabayashi, M.Oshima, S.Ohya, P.N.Hai, M.Tanaka
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[Journal Article] Nature of Magnetic Coupling between Mn Ions in As-Grown Ga1-xMnxAs Studied by X-Ray Magnetic Circular Dichroism2008
Author(s)
Y. Takeda, M. Kobayashi, T. Okane, T. Ohkochi, J. Okamoto, Y. Saitoh, K. Kobayashi, H. Yamagami, A. Fujimori, A. Tanaka, J. Okabayashi, M. Oshima, S. Ohya, P.N. Hai, M. Tanaka
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Peer Reviewed
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[Journal Article] X-ray magnetic circular dichroism characterization of GaN/Ga6<1-x>Mn xN digital ferromagnetic heterostructure2007
Author(s)
J.I.Hwang, M.Kobayashi, G.S.Song, A.Fujimori, A.Tanaka, Z.S.Yang, H.-J.Lin, D.J.Huang, C.T.Chen, H.C.Jeon, T.W.Kang
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Journal Title
Related Report
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[Journal Article] X-Ray Magnetic Circular Dichroism Characterization of GaN/Ga1-xMnxN Digital Ferromagnetic Heterostructure2007
Author(s)
J.I. Hwang, M. Kobayashi, G.S. Song, A. Fujimori, A. Tanaka, Z.S. Yang, H.-J. Lin, D.J. Huang, C.T. Chen, H.C. Jeon, T.W. Kang
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[Presentation] Electronic band dispersion of the oxide semiconductor ZnO revealed by soft x-ray angle-resolved photoemission spectroscopy2008
Author(s)
M.Kobayashi, T.Ohkochi, G.S.Song, T.Kataoka, Y.Sakamoto, A.Fujimori, Y.Takeda, T.Okane, Y.Saitoh, H.Yamagami, H.Yamahara, H.Saeki, T.Kawai, H.Tabata
Organizer
29-th International Conference on the Physics of Semiconductors (ICPS 2008)
Place of Presentation
Rio de Janeiro
Year and Date
2008-07-10
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