TITLE

Polarity reversal of a magnetic vortex core by a unipolar, nonresonant in-plane pulsed magnetic field

AUTHOR(S)
Keavney, D. J.; Cheng, X. M.; Buchanan, K. S.
PUB. DATE
April 2009
SOURCE
Applied Physics Letters;4/27/2009, Vol. 94 Issue 17, p172506
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report the polarity reversal of a magnetic vortex core using a nonresonant in-plane pulsed magnetic field of arbitrary waveform studied using time-resolved x-ray photoemission electron microscopy and micromagnetic simulations. The imaging and simulations show that a 5 mT pulse, higher than the critical field for nonlinear effects, effectively leads to the randomization of the vortex core polarity. The micromagnetic simulations further show that the onset of stochastic core polarity randomization does not necessarily coincide with the critical reversal field, leading to a field window for predictable core reversal.
ACCESSION #
38712322

 

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