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Measurement of the anisotropy constant of antiferromagnets in metallic polycrystalline exchange biased systems

Vallejo-Fernandez, G., Fernandez-Outon, L.E. and O'Grady, K. (2007) Measurement of the anisotropy constant of antiferromagnets in metallic polycrystalline exchange biased systems. Applied Physics Letters, 91 (22). pp. 212503-1. ISSN 0003-6951

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Abstract

A method for the measurement of the anisotropy constant of the antiferromagnet (AF) KAF in exchange biased systems has been developed. This has been achieved by measurement of the median blocking temperature 〈TB〉 of a CoFe/IrMn bilayer. In thermal activation-free conditions, this is the temperature at which equal volumes of the AF are oriented in opposite senses. Hence, for a grain size dependent model, the critical volume for thermal activation at this point is equal to the median volume of the grain size distribution. A value of (5.5±0.5)×106 erg/cc has been obtained at room temperature for a 4 nm thick IrMn layer.

Item Type: Article
Academic Units: The University of York > Physics (York)
Depositing User: York RAE Import
Date Deposited: 12 Aug 2009 13:55
Last Modified: 12 Aug 2009 13:55
Published Version: http://dx.doi.org/10.1063/1.2817230
Status: Published
Publisher: American Institute of Physics
Identification Number: 10.1063/1.2817230
URI: http://eprints.whiterose.ac.uk/id/eprint/5625

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