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In-plane tunneling anisotropic magnetoresistance in (Ga,Mn)As/GaAs Esaki diodes in the regime of the ecxess current

URN to cite this document:
urn:nbn:de:bvb:355-epub-320250
Shiogai, Junichi ; Ciorga, Mariusz ; Utz, Martin ; Schuh, Dieter ; Kohda, Makoto ; Bougeard, Dominique ; Nojima, Tsutomu ; Weiss, Dieter ; Nitta, Junsaku
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Date of publication of this fulltext: 06 Jul 2015 12:56


Abstract

We investigate the angular dependence of the tunneling anisotropic magnetoresistance in (Ga,Mn)As/n-GaAs spin Esaki diodes in the regime where the tunneling process is dominated by the excess current through midgap states in (Ga,Mn)As. We compare it to similar measurements performed in the regime of band-to-band tunneling. Whereas the latter show biaxial symmetry typical for magnetic anisotropy observed in (Ga,Mn)As samples, the former is dominated by uniaxial anisotropy along the 〈110〉 axes.


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