We report ferromagnetic resonance (FMR) studies of epitaxial MnO∕GaMnAs bilayers. The FMR data have revealed a distinct unidirectional anisotropy about the [11¯0] axis, which we attribute to exchange biasing of ferromagnetic GaMnAs by the adjacent antiferromagnetic MnO layer. The observed unidirectional anisotropy is surprisingly robust with respect to temperature and changing magnetic field.
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Dziatkowski et al. (2006) studied this question.
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