Bias dependence of spin injection into GaAs from Fe, FeCo, and (Ga,Mn)As contacts

B. Endres; F. Hoffmann; C. Wolf; A. Einwanger; M. Utz; D. Schuh; G. Woltersdorf; M. Ciorga; D. Weiss; C. H. Back; G. Bayreuther

doi:10.1063/1.3553932

Bias dependence of spin injection into GaAs from Fe, FeCo, and (Ga,Mn)As contacts

B. Endres, F. Hoffmann, C. Wolf, A. Einwanger, M. Utz, D. Schuh, G. Woltersdorf, M. Ciorga, D. Weiss, C. H. Back, G. Bayreuther

University of Regensburg

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Spin injection from Fe(001) and (Ga,Mn)As(001) into n-GaAs(001) was investigated using a method which provides two-dimensional cross-sectional images of the spin polarization in GaAs. While the distribution of the spin polarization below the injecting contact is nearly uniform for (Ga,Mn)As, a strong confinement near the contact edge is observed for Fe and FeCo. The spin polarization in GaAs changes sign when the injected current is reversed. Multiple sign reversals as a function of bias voltage as reported previously for Fe injectors are not observed with (Ga,Mn)As and Fe contacts grown on clean n -GaAs in agreement with earlier results for an epitaxial FeCo injector.

Original language	English
Article number	07C505
Journal	Journal of Applied Physics
Volume	109
Issue number	7
DOIs	https://doi.org/10.1063/1.3553932
State	Published - 1 Apr 2011
Externally published	Yes

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title = "Bias dependence of spin injection into GaAs from Fe, FeCo, and (Ga,Mn)As contacts",

abstract = "Spin injection from Fe(001) and (Ga,Mn)As(001) into n-GaAs(001) was investigated using a method which provides two-dimensional cross-sectional images of the spin polarization in GaAs. While the distribution of the spin polarization below the injecting contact is nearly uniform for (Ga,Mn)As, a strong confinement near the contact edge is observed for Fe and FeCo. The spin polarization in GaAs changes sign when the injected current is reversed. Multiple sign reversals as a function of bias voltage as reported previously for Fe injectors are not observed with (Ga,Mn)As and Fe contacts grown on clean n -GaAs in agreement with earlier results for an epitaxial FeCo injector.",

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T1 - Bias dependence of spin injection into GaAs from Fe, FeCo, and (Ga,Mn)As contacts

AU - Endres, B.

AU - Hoffmann, F.

AU - Wolf, C.

AU - Einwanger, A.

AU - Utz, M.

AU - Schuh, D.

AU - Woltersdorf, G.

AU - Ciorga, M.

AU - Weiss, D.

AU - Back, C. H.

AU - Bayreuther, G.

PY - 2011/4/1

Y1 - 2011/4/1

N2 - Spin injection from Fe(001) and (Ga,Mn)As(001) into n-GaAs(001) was investigated using a method which provides two-dimensional cross-sectional images of the spin polarization in GaAs. While the distribution of the spin polarization below the injecting contact is nearly uniform for (Ga,Mn)As, a strong confinement near the contact edge is observed for Fe and FeCo. The spin polarization in GaAs changes sign when the injected current is reversed. Multiple sign reversals as a function of bias voltage as reported previously for Fe injectors are not observed with (Ga,Mn)As and Fe contacts grown on clean n -GaAs in agreement with earlier results for an epitaxial FeCo injector.

AB - Spin injection from Fe(001) and (Ga,Mn)As(001) into n-GaAs(001) was investigated using a method which provides two-dimensional cross-sectional images of the spin polarization in GaAs. While the distribution of the spin polarization below the injecting contact is nearly uniform for (Ga,Mn)As, a strong confinement near the contact edge is observed for Fe and FeCo. The spin polarization in GaAs changes sign when the injected current is reversed. Multiple sign reversals as a function of bias voltage as reported previously for Fe injectors are not observed with (Ga,Mn)As and Fe contacts grown on clean n -GaAs in agreement with earlier results for an epitaxial FeCo injector.

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U2 - 10.1063/1.3553932

DO - 10.1063/1.3553932

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JO - Journal of Applied Physics

JF - Journal of Applied Physics

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Bias dependence of spin injection into GaAs from Fe, FeCo, and (Ga,Mn)As contacts

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