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On the field dependence of the interface energy in AF/FM bilayers
Authors:JRL de Almeida  JR Steiner  SM Rezende
Institution:1. Departamento de Física, Universidade Federal de Pernambuco, 50670-901, Recife-PE, Brazil;2. Instituto de Fisica, Universidade de São Paulo, Caixa Postal 66318, São Paulo, SP, Brazil
Abstract: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 externally applied cooling 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.
Keywords:75  70Cn  75  30Gw  75  50  Lk
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