2010 Fiscal Year Final Research Report
Development of spintronic materials with multi-functionality
| Project/Area Number |
20360005
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Applied materials science/Crystal engineering
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
ASANO Hidefumi Nagoya University, 工学研究科, 教授 (50262853)
|
|---|
| 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)
|
|---|
| 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)
|
|---|
| Project Period (FY) |
2008 – 2010
|
| 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 |
|---|
| 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.
|
Research Products
(15 results)
