Effects of nonmagnetic metal additives in metallic antiferromagnets on exchange bias

Details Effects of nonmagnetic metal additives in metallic antiferromagnets on exchange bias Effects of nonmagnetic metal additives in metallic antiferromagnets on exchange bias

2007-01-08

arxiv.org/abs/cond-mat/0701155v1

Physics

Condensed Matter

Materials Science

13 pages, 4 figures

Scientific paper

The effect of nonmagnetic metal additives in metallic antiferromagnets (AFMs) on the exchange bias (EB) has been investigated from a structural, magnetic and Monte Carlo simulation point of view in bilayers of CoFe/IrMn:Cu. Dilution by Cu atoms throughout the volume of the AFM IrMn give rise to an enhanced EB field for temperatures between 5 K and 300 K. The thermoremanent magnetization of the AFM-only is also enhanced with dilution, shows qualitatively the same temperature dependence as EB field and is at the origin of the EB mechanism. Monte Carlo simulations based on a Heisenberg model and temperature dependent uncompensated AFM moments confirm well the experimental results.

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