TITLE

Anisotropy of the magnetotransport in (Ga,Mn)As/MnAs paramagnetic-ferromagnetic hybrid structures

AUTHOR(S)
Ye, S.; Klar, P.J.; Hartmann, Th.; Heimbrodt, W.; Lampalzer, M.; Nau, S.; Torunski, T.; Stolz, W.; Kurz, T.; von Nidda, H.-A. Krug; Loidl, A.
PUB. DATE
November 2003
SOURCE
Applied Physics Letters;11/10/2003, Vol. 83 Issue 19, p3927
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We investigated the temperature-dependent magnetoresistance of granular (Ga,Mn)As/MnAs hybrids grown on (100) GaAs in different transport geometries. The observed magnetoresistance effects are much bigger than for a corresponding (Ga,Mn)As reference sample without MnAs nanoclusters. We find that the magnetoresistance effects depend strongly on the chosen transport geometry. When the external field is perpendicular to the sample plane the effects are largest. The smallest effects occur when the external field is in the sample plane and parallel to the current. Furthermore, we have established by ferromagnetic resonance studies that the magnetic properties of the ensemble of ferromagnetic MnAs nanoclusters is similar for the magnetic field orientations studied. Therefore, the observed anisotropy of the magnetoresistance mainly reflects the difference in current path through the sample which leads to a variation of the degree of interaction between the free carriers in the matrix and nanoclusters. © 2003 American Institute of Physics.
ACCESSION #
11332769

 

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