Microscopic model for exchange bias from grain-boundary disorder in a ferromagnet/antiferromagnet thin film with a nanocrystalline microstructure

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dc.contributor.authorCortie, DLen_AU
dc.contributor.authorBiternas, AGen_AU
dc.contributor.authorChantrell, RWen_AU
dc.contributor.authorWang, XLen_AU
dc.contributor.authorKlose, Fen_AU
dc.date.accessioned2016-06-23T05:56:48Zen_AU
dc.date.available2016-06-23T05:56:48Zen_AU
dc.date.issued2014-01-01en_AU
dc.date.statistics2016-06-23en_AU
dc.description.abstractMonte Carlo spin simulations were coupled to a Voronoi microstructure-generator to predict the magnitude and behavior of exchange bias in a magnitude/antiferromagnet (AF) thin film bilayer with a nanocrystalline microstructure. Our model accounts for the effects of irregular grain-shapes, finite-sized particles, and the possible presence of local random-fields originating from the antiferromagnet's grain-boundary regions. As the grain-boundary represents a crystal-structure distortion, we model the local effect on the exchange constants in the Gaussian approximation which can cause regions resembling a spin glass confined to an unusual 2D topology. Although an ensemble of completely disconnected AF grains isolated by non-magnetic barriers provides a small exchange bias, the introduction of a spin-glass network at the boundaries causes a four-fold enhancement in the magnitude of the loop-shift. This implies the importance of local grain-boundary behavior in defect-engineered antiferromagnets. © AIP Publishing LLC.en_AU
dc.identifier.articlenumber32402en_AU
dc.identifier.citationCortie, D. L., Biternas, A. G., Chantrell, R. W., Wang, X. L., & Klose, F. (2014). Microscopic model for exchange bias from grain-boundary disorder in a ferromagnet/antiferromagnet thin film with a nanocrystalline microstructure. Applied Physics Letters, 105(3), 032402. doi:10.1063/1.4890580en_AU
dc.identifier.govdoc6749en_AU
dc.identifier.issn1077-3118en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleApplied Physics Lettersen_AU
dc.identifier.urihttp://dx.doi.org/10.1063/1.4890580en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/7070en_AU
dc.identifier.volume105en_AU
dc.language.isoenen_AU
dc.publisherAIP Publishing LLCen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectMicrostructureen_AU
dc.subjectFilmsen_AU
dc.subjectCrystalsen_AU
dc.subjectGrain boundariesen_AU
dc.subjectGaussian processesen_AU
dc.titleMicroscopic model for exchange bias from grain-boundary disorder in a ferromagnet/antiferromagnet thin film with a nanocrystalline microstructureen_AU
dc.typeJournal Articleen_AU
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