Project Area | Creation and control of spin current |
Project/Area Number |
19048012
|
Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
|
Allocation Type | Single-year Grants |
Review Section |
Science and Engineering
|
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)
|
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)
|
Project Period (FY) |
2007 – 2010
|
Project Status |
Completed (Fiscal Year 2010)
|
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)
|
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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