Diffracted magneto-optical Kerr effects of permalloy ring arrays

DOIResolve DOI: http://doi.org/10.1063/1.1857411
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Subjectarrays; ferromagnetic materials; Kerr magneto-optical effect; magnetic hysteresis; magnetic switching; magnetic thin films; metallic thin films; micromagnetics; nucleation; Permalloy; rings (structures)
AbstractDiffracted magneto-optical Kerr effect (MOKE) technique was used to study the quasistatic magnetization switching of thin-film permalloy ring structures. Two different switching mechanisms were observed, dependent on the width of the annular portion of the ring. For small widths, a two-step switching is found, from an initial onion state to a state of circulation magnetization around the ring to a final onion state. In the wider rings, the switching from the circulation state to the onion state takes place via nucleation of a vortex within the annulus. The presence of the vortex is determined by the higher spatial frequency information revealed by diffracted MOKE, and through comparison with micromagnetic simulation.
PlaceJacksonville, Florida (USA)
AffiliationNational Research Council Canada; National Institute for Nanotechnology
Peer reviewedNo
NPARC number12327952
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Record identifierea7d19dd-4a71-4d42-8ffc-27be2c1cf504
Record created2009-09-10
Record modified2016-05-09
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