On the Field Dependence of the Interface Energy in Af/FM Bilayers

Details On the Field Dependence of the Interface Energy in Af/FM Bilayers On the Field Dependence of the Interface Energy in Af/FM Bilayers

2003-09-23

arxiv.org/abs/cond-mat/0309535v1

Physics

Condensed Matter

Materials Science

12 pages, 9 figures, submitted to Journ.Mag.Mag.Mater

Scientific paper

In the investigations of antiferromagnetic (AF)/ ferromagnetic (FM) bilayer samples, often distinct experimental techniques yield different values for the measured exchange anisotropy field (HE). We propose that the observed discrepancy may be accounted in part by the dependence of the unidirectional anisotropy with the value of the external applied field (h). Using a simple microscopic model for representing the AF/FM interface, which incorporates the effect of interface roughness, we show that the interface energy between the AF and FM layer indeed varies with h, as recently observed in anisotropic magnetoresistance measurements, lending support to our proposal.

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