Enhanced Curie temperature and spin polarization in Mn4FeGe3

被引：29
作者：
Chen, T. Y. [1 ]
Chien, C. L.
Petrovic, C.
机构：
[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[2] Brookhaven Natl Lab, Dept Mat Sci, Upton, NY 11973 USA
来源：
APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 14期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1063/1.2794425
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Intermetallic ferromagnetic compound Mn5Ge3, with Curie temperature T-C=296 K, a spin polarization of P=42%, and a good lattice match to semiconductors, is a potential spin injector for spintronics. We report the enhanced magnetic properties and spin polarization of Mn4FeGe3. By replacing one Mn atom in Mn5Ge3 with Fe, the T-C of Mn4FeGe3 has been enhanced to 319.50 K, while still maintaining the same crystal structure, high electrical conductivity, and a high residual resistivity ratio of 5.33. More importantly, the spin polarization in excess of 60% of Mn4FeGe3, much higher than that of Mn5Ge3, has been realized. (C) 2007 American Institute of Physics.
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