Regensburg 2002 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 29: Spinabh
ängiger Transport

HL 29.14: Vortrag

Mittwoch, 13. März 2002, 18:45–19:00, H13

Noncollinear Ferromagnetism in (III,Mn)V Semiconductors — •John Schliemann and Allan H. MacDonald — The University of Texas at Austin

We investigate the stability of the collinear ferromagnetic state in kinetic exchange models for (III,Mn)V semiconductors with randomly distributed Mn ions . Our results suggest that noncollinear ferromagnetism is commom to these semiconductor systems. The instability of the collinear state is due to long-ranged fluctuations involving a large fraction of the localized magnetic moments. We address conditions that favor the occurrence of noncollinear groundstates and discuss unusual behavior that we predict for the temperature and field dependence of its saturation magnetization.

Ref.: J. Schliemann and A.H. MacDonald, cond-mat/0107573