Noncollinear Ferromagnetism in (III,Mn)V Semiconductors

Details Noncollinear Ferromagnetism in (III,Mn)V Semiconductors Noncollinear Ferromagnetism in (III,Mn)V Semiconductors

2001-07-27

arxiv.org/abs/cond-mat/0107573v2

Phys. Rev. Lett. 88, 137201 (2002)

Physics

Condensed Matter

5 pages, one figure included, presentation of technical aspects simplified, version to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.88.137201

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 {\em noncollinear ferromagnetism} is commom to these semiconductor systems. The instability of the collinear state is due to long-ranged fluctuations invloving 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.

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