Direct evidence of imprinted vortex states in the antiferromagnet of exchange biased microdisks

Salazar-Alvarez, G.; Kavich, J. J.; Sort, J.; Mugarza, A.; Stepanow, S.; Potenza, A.; Marchetto, H.; Dhesi, S. S.; Baltz, V.; Dieny, B.; Weber, A.; Heyderman, L. J.; Nogués, J.; Gambardella, P.
July 2009
Applied Physics Letters;7/6/2009, Vol. 95 Issue 1, p012510
Academic Journal
The magnetic domain structure of patterned antiferromagnetic/ferromagnetic Ir20Mn80/Ni80Fe20 bilayer microdisk arrays has been investigated using layer-specific polarized x-ray photoemission electron microscopy and magnetic circular dichroism. Magnetic imaging at the Fe and Mn L-edge resonances provided direct evidence of a vortex state imprinted into the antiferromagnet at the interface. The opposite magnetic contrast between the layers indicated a reversed chirality of the imprinted vortex state, and a quantitative analysis of the magnetic moment from the dichroism spectra showed that uncompensated Mn spins equivalent to about 60% of a monolayer of bulk Ir20Mn80 contributed to the imprinted information at the interface.


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