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

共 34 条

[1] Spin injection and relaxation in ferromagnet-semiconductor heterostructures [J].

Adelmann, C ;

Lou, X ;

Strand, J ;

Palmstrom, CJ ;

Crowell, PA .

PHYSICAL REVIEW B, 2005, 71 (12)

[2] Spin-diffusion lengths in metals and alloys, and spin-flipping at metal/metal interfaces: an experimentalist's critical review [J].

Bass, Jack ;

Pratt, William P., Jr. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2007, 19 (18)

[3] Order-driven contribution to the planar Hall effect in Fe3Si thin films -: art. no. 172401 [J].

Bowen, M ;

Friedland, KJ ;

Herfort, J ;

Schönherr, HP ;

Ploog, KH .

PHYSICAL REVIEW B, 2005, 71 (17)

[4] The role of the symmetry of spin fluctuation coherence on magnetotransport in Fe3Si thin films [J].

Bowen, M ;

Friedland, KJ ;

Herfort, J ;

Schönherr, HP ;

Ploog, KH .

EUROPHYSICS LETTERS, 2006, 74 (01) :163-169

[5] Rate-equation model of spin dynamics and polarized light emission for spin light-emitting diodes [J].

Brandt, Oliver ;

Ramsteiner, Manfred ;

Flissikowski, Timur ;

Herfort, Jens ;

Grahn, Holger T. .

PHYSICAL REVIEW B, 2010, 81 (11)

[6]

Campbell I A, 1982, FERROMAGNETIC MAT, V3, P797

[7] PLANAR MAGNETORESISTIVITY AND PLANAR HALL EFFECT MEASUREMENTS IN NICKEL SINGLE-CRYSTAL THIN FILMS [J].

CHEN, TT ;

MARSOCCI, VA .

PHYSICA, 1972, 59 (03) :498-&

[8] Planar Hall effect in ferromagnets [J].

Épshtein, ÉM .

PHYSICS OF THE SOLID STATE, 2002, 44 (07) :1327-1329

[9] High energy, high resolution photoelectron spectroscopy of Co2Mn1-xFexSi [J].

Fecher, Gerhard H. ;

Balke, Benjamin ;

Ouardi, Siham ;

Felser, Claudia ;

Schoenhense, Gerd ;

Ikenaga, Eiji ;

Kim, Jung-Jin ;

Ueda, Shigenori ;

Kobayashi, Keisuke .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2007, 40 (06) :1576-1581

[10] Substituting the main group element in cobalt-iron based Heusler alloys:: Co2FeAl1-xSix [J].

Fecher, Gerhard H. ;

Felser, Claudia .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2007, 40 (06) :1582-1586

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