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Thermal instabilities in exchange biased materials

Fernandez-Outon, L.E., Vallejo-Fernandez, G., Manzoor, S. and O’Grady, K. (2006) Thermal instabilities in exchange biased materials. Journal of Magnetism and Magnetic Materials, 303 (2). pp. 296-301. ISSN 0304-8853

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The use of antiferromagnetic (AF) materials to pin a soft ferromagnet (FM) in a spin-valve, read head, or MRAM cell, has focussed attention on the exchange bias phenomenon. We report on a study of the thermal stability of exchange bias systems, IrMn/CoFe and FeMn/NiFe, with different thicknesses and grain sizes. For these materials a temperature has been determined at which thermal activation does not affect the state of the antiferromagnet, leading to reproducible data. Grain size studies have shown that the coercivity and exchange bias have different origins. Training effects studied over a range of temperatures from 4.2 to 400 K indicate a range of different contributions to exchange bias from the magnetic state of the antiferromagnet.

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Physics (York)
Depositing User: York RAE Import
Date Deposited: 22 Apr 2009 10:54
Last Modified: 22 Apr 2009 10:54
Published Version: http://dx.doi.org/10.1016/j.jmmm.2006.01.080
Status: Published
Publisher: Elsevier Science B.V., Amsterdam
Identification Number: 10.1016/j.jmmm.2006.01.080
URI: http://eprints.whiterose.ac.uk/id/eprint/6721

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