| Project/Area Number |
20360005
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied materials science/Crystal engineering
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| Research Institution | Nagoya University |
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Principal Investigator |
ASANO Hidefumi Nagoya University, 工学研究科, 教授 (50262853)
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| Co-Investigator(Kenkyū-buntansha) |
FUJII Shinpei 鹿児島大学, 理学部, 教授 (90189994)
ISHIDA Shoji 鹿児島大学, 理学部, 教授 (10041237)
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| Co-Investigator(Renkei-kenkyūsha) |
UEDA Kenji 名古屋大学, 大学院・工学研究科, 准教授 (10393737)
MIYAWAKI Tetsuya 名古屋大学, 大学院・工学研究科, 助教 (10596844)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000)
Fiscal Year 2010: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2009: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2008: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
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| Keywords | 新機能材料 / ハーフメタル / スピントロニクス / 反強磁性体 / スピン分極率 / アンドレーエフ反射 |
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| Research Abstract |
(1) Reduced spin magnetic moment in half-metallic compounds : The magnetic and transport properties of bulk polycrystalline samples of Fe_2(Cr_<1-x>M_x)Si (M=Ti, V) Heusler conpounds have been investigated. These Fe-containing Heusler conpounds were found to be half-metals with low magnetic moment and large densities of states at the Fermi energy.
(2) Strain effect in an antiferromagnetic Heusler compound : Strain effect on the properties of an antiferromagnetic Heusler compound Fe_2VSi was investigated. The strong enhancement in antiferromagnetic Neel temperatures T_N up to 193K was observed in coherently strained Fe_2VSi films.
(3) Half-metallicity in an antiferromagnetic material : Coexistence of antiferromagnetism and high spin polarization has been found in bulk samples of double perovskite SrLaVMoO_6. The large enhancement in Neel temperatures T_N was observed in epitaxial SrLaVMoO_6 thin films. Experimental evidence of a half-metallic electronic structure was obtained from XPS study.
(4) Experiments on half-metallic nano-hetero structures : We have developed the junction method using NbN as a superconducting electrode for measuring spin polarization of various ferromagnetic materials including half-metals. Application of this NbN junction method to Fe_4N, which was predicted to have current spin polarization P_σ of 1, resulted in DOS spin polarization P_<DOS> of -0.68. The NbN junction method was found to be a versatile technique which can simultaneously measure two types of spin polarization of P_<DOS> and P_σ.
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