| 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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| 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 |
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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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