A spiraling antiferromagnetic (AF) spin structure, featured in many theoretical models of exchange bias, has been observed in Co/FeMn/permalloy trilayers. Both the turn angle between Co and permalloy layers and the pitch angle between adjacent antiferromagnetic spins depend on the thickness of the intervening antiferromagnetic layer.

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PUBLICATIONS:

F. Y. Yang and C. L. Chien, "Spiraling Spin Structure in an Exchange-Coupled Antiferromagnetic Layer," Phys. Rev. Lett 85, 2597 (2000).