Abstract
Disorder-induced noncollinear ferromagnetism is a common feature of kinetic-exchange models for ferromagnetic (III,Mn)V semiconductors with randomly distributed Mn ions. The instability of the collinear state is due to long-ranged fluctuations involving a large fraction of the localized magnetic moments. In cases were the true ground state magnetization is reduced substantially from the maximum value of the collinear state one finds a complex energy landsacpe with many metastable minima. Finally we report on studies of the influence of an external field realigning the Mn spins starting from a glassy zero-field ground state.
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