Disorder-induced reversal of spin polarization in the Heusler alloy Co2FeSi

被引：36

作者：

Bruski, P. ^{[1
]}

Erwin, S. C. ^{[2
]}

Ramsteiner, M. ^{[1
]}

Brandt, O. ^{[1
]}

Friedland, K. -J. ^{[1
]}

Farshchi, R. ^{[1
]}

Herfort, J. ^{[1
]}

Riechert, H. ^{[1
]}

机构：

[1] Paul Drude Inst Festkorperelekt, D-10117 Berlin, Germany

[2] USN, Res Lab, Ctr Computat Mat Sci, Washington, DC 20375 USA

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 14期

关键词：

MAGNETIC-MOMENT; TEMPERATURE; GROWTH; ENERGY; FILMS;

D O I：

10.1103/PhysRevB.83.140409

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the spin polarization in the conduction band of Co2FeSi layers with a different degree of structural order. The injected spin polarization in Co2FeSi/(Al,Ga)As spin light-emitting diodes as well as the planar Hall effect measured for the Co2FeSi injectors exhibit a sign reversal between injectors crystallized in the ordered L2(1) phase and the Fe-Si disordered B2 phase. These results are explained by a disorder-induced change in the spin polarization at the Fermi energy of Co2FeSi. Support for the occurrence of such a striking change in the electronic band structure is obtained by first principles calculations.

引用

页数：4

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