Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/7070
Title: Microscopic model for exchange bias from grain-boundary disorder in a ferromagnet/antiferromagnet thin film with a nanocrystalline microstructure
Authors: Cortie, DL
Biternas, AG
Chantrell, RW
Wang, XL
Klose, F
Keywords: Antiferromagnetism
Microstructure
Films
Crystals
Grain boundaries
Gaussian process
Issue Date: 1-Jan-2014
Publisher: AIP Publishing LLC
Citation: Cortie, 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:10.1063/1.4890580
Abstract: Monte 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.
Gov't Doc #: 6749
URI: http://dx.doi.org/10.1063/1.4890580
http://apo.ansto.gov.au/dspace/handle/10238/7070
Appears in Collections:Journal Articles

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