Endres, Bernhard and Hoffmann, Frank and Wolf, Christian and Einwanger, Andreas and Utz, Martin and Schuh, Dieter and Woltersdorf, Georg and Ciorga, Mariusz and Weiss, Dieter and Back, Christian and Bayreuther, Günther
Bias dependence of spin injection into GaAs from Fe, FeCo, and (Ga,Mn)As contacts.
Journal of Applied Physics 109 (07C505).
Other URL: http://link.aip.org/link/doi/10.1063/1.3553932
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.