The origin of exchange biasing in FeMn/Co bilayers is elucidated using magneto-optic Kerr effect and x-ray dichroism. It is found that the FeMn spin structure is aligned with the ferromagnetic (FM) moment of the Co layer, indicating that ``spin flop'' coupling is not the mechanism for exchange bias in this system. Futhermore, the Fe forms an uncompensated surface. It is likely that the FM Fe spins play a key role in the generation of the exchange bias. These results provide new insight to the mechanism of exchange biasing in metallic ferromagnetic/antiferromagnetic systems.
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Antel et al. (1999) studied this question.
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