Direct evidence of imprinted vortex states in the antiferromagnet of exchange biased microdisks
Résumé
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.
Domaines
Matière Condensée [cond-mat]| Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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