Half-Metallic Ferromagnetism with Unexpectedly Small Spin Splitting in the Heusler Compound Co2FeSi

被引：141

作者：

Bombor, Dirk ^{[1
]}

Blum, Christian G. F. ^{[1
]}

Volkonskiy, Oleg ^{[1
]}

Rodan, Steven ^{[1
]}

Wurmehl, Sabine ^{[1
,2
]}

Hess, Christian ^{[1
]}

Buechner, Bernd ^{[1
,2
]}

机构：

[1] IFW Dresden, D-01171 Dresden, Germany

[2] Tech Univ Dresden, Inst Festkorperphys, D-01062 Dresden, Germany

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 06期

关键词：

ELECTRICAL-RESISTIVITY; TEMPERATURE-DEPENDENCE; SPINTRONICS;

D O I：

10.1103/PhysRevLett.110.066601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Half-metallic ferromagnetism stands for the technologically sought-after metallicity with 100% spin polarization. Electrical transport should, in principle, sensitively probe half-metallic ferromagnetism, since electron-magnon scattering processes are expected to be absent, with clear-cut consequences for the resistivity and the magnetoresistance. Here we present electrical transport data for single-crystalline Co2FeSi, a candidate half-metallic ferromagnet Heusler compound. The data reveal a textbooklike exponential suppression of the electron-magnon scattering rate with decreasing temperature which provides strong evidence that this material indeed possesses perfect spin polarization at low temperature. However, the energy scale for thermally activated spin-flip scattering is relatively low (activation gap Delta approximate to 100 K) which has decisive influence on the magnetoresistance and the anomalous Hall effect, which exhibit strong qualitative changes when crossing T approximate to 100 K. DOI: 10.1103/PhysRevLett.110.066601

引用

页数：5

共 23 条

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