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Development of spintronic materials with multi-functionality

多功能自旋电子材料的开发

基本信息

批准号：
20360005
负责人：
ASANO Hidefumi
金额：
$ 11.65万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2008
资助国家：
日本
起止时间：
2008 至 2010
项目状态：
已结题

项目摘要

(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.

(1)半金属化合物中的约化自旋磁矩：研究了Fe_2（Cr_<1-x>M_x）Si（M=Ti，V）Heusler化合物大块多晶样品的磁性和输运性质。这些含Fe的Heusler化合物被发现是具有低磁矩和在费米能量下的大态密度的半金属。(2)反铁磁Heusler化合物中的应变效应：研究了应变对反铁磁Heusler化合物Fe_2VSi性质的影响。在共格应变Fe_2VSi薄膜中观察到反铁磁Neel温度T_N的强烈增强，最高可达193 K。(3)反铁磁材料中的半金属性：在双钙钛矿SrLaVMoO_6体样品中发现了反铁磁和高自旋极化的共存。在外延SrLaVMoO_6薄膜中观察到了Neel温度T_N的大幅度提高。从XPS研究中获得了半金属电子结构的实验证据。(4)半金属纳米异质结构的实验：我们已经开发了使用NbN作为超导电极的结方法，用于测量包括半金属在内的各种铁磁材料的自旋极化。将这种NbN结方法应用于Fe_4N（预测其电流自旋极化P_σ为1），得到DOS自旋极化P_σ<DOS>为-0.68。NbN结法是一种通用的方法，它可以同时测量P_和P_σ两种自旋极化<DOS>。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Carrier doping effects in the antiferromagnetic double perovskite Sr_<2-x>La_xVMoO_6

反铁磁双钙钛矿Sr_<2-x>La_xVMoO_6中的载流子掺杂效应

DOI：
发表时间：
2010
期刊：
影响因子：
0
作者：
T.Hohjo;H.Matsushima;H.Gotoh;Y.Takeda;K.Ueda;H.Asano
通讯作者：
H.Asano

Structures and spin polarization of an antiferromagnet SrLaVMoO6

反铁磁体 SrLaVMoO6 的结构和自旋极化

DOI：
10.3379/msjmag.0912rc0009
发表时间：
2010
期刊：
Journal of The Magnetics Society of Japan
影响因子：
0
作者：
H. Matsushima;H. Gotoh;Y. Takeda;K. Ueda;H. Asano;J. Zhong;A. Rajanikanth;K. Hono
通讯作者：
K. Hono

Measurement of Interfacial Spin Polarization of Ferromagnetic Materials with the Use of Epitaxial NbN Junctions

使用外延 NbN 结测量铁磁材料的界面自旋极化