Abstract
Evidence of 90° coupling between Fe layers in epitaxial Fe/NM/Fe sandwiches (NM = Cr, Au, Al) has recently been reported by various groups. Following Slonczewski's approach, we interpret this 90° coupling as arising from spatial nanoscopic fluctuations in the interlayer coupling through the NM spacer layer. We investigate numerically a model based on this assumption. The magnetization curves and coupling energy have been calculated in the realistic situation where thin NM and Fe layers are deposited on a thick Fe whisker. We investigate in particular the role of the magnetocrystalline anisotropy in the properties of this 90° coupling. We also compare the thermal variation of the bilinear coupling (A 12) with that of the 90° coupling.
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