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Effects of nonmagnetic metal additives in metallic antiferromagnets on exchange bias

Marian Fecioru-Morariu·Syed Rizwan Ali·Cristian Papusoi·Martin Sperlich·Gernot Guentherodt
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Abstract

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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Marian Fecioru-Morariu, Syed Rizwan Ali, Cristian Papusoi, Martin Sperlich, Gernot Guentherodt. 2007-01-08. Effects of nonmagnetic metal additives in metallic antiferromagnets on exchange bias. https://arxiv.org/abs/cond-mat/0701155

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