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Paper detail

Temperature Dependent Magnetic Anisotropy in (Ga,Ma)As Layers

It is demonstrated by SQUID magnetization measurements that (Ga,Mn)As films can exhibit rich characteristics of magnetic anisotropy depending not only to the epitaxial strain but being strongly influenced by the hole and Mn concentration, and temperature. This behavior reflects the spin anisotropy of the valence subbands and corroborates predictions of the mean field Zener model of the carrier mediated ferromagnetism in III-V diluted magnetic semiconductors with Mn. At the same time the existence of in-plane uniaxial anisotropy with [110] the easy axis is evidenced. This is related to the top/bottom symmetry breaking, resulting in the lowering of point symmetry of (Ga,Mn)As to the C_{2v} symmetry group. The latter mechanism coexists with the hole-induced cubic anisotropy, but takes over close to T_C.

preprint2002arXivOpen access
M. SawickiF. MatsukuraA. IdziaszekT. DietlG. M. SchottC. RuesterG. KarczewskiG. SchmidtL. W. Molenkamp
cond-mat.str-elcond-mat.mtrl-sci
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M. SawickiF. MatsukuraA. IdziaszekT. DietlG. M. SchottC. RuesterG. KarczewskiG. SchmidtL. W. Molenkamp

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