2010 Fiscal Year Final Research Report
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 |
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| 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 |
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| Review Section |
Science and Engineering
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| Research Institution | The University of Tokyo |
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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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| 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 |
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| 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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[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 Title
J.Phys.Condens.Mat. 23
Pages: 176001-1-"176001-5"
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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 Title
Phys.Rev.B 81
Pages: 075204-1-"075204-7"
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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 Title
Phys.Rev.B 82
Pages: 184419-1-"184419-8"
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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 Title
Phys.Rev.Lett. 100
Pages: 247202-1-"247202-4"
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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
Appl.Phys.Lett. 91
Pages: 072507-1-"072507-3"
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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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