Abstract
A model of polycrystalline F/AF bilayers based on the Voronoi construction is considered to investigate the microstructure effect on exchange bias properties. This study is carried out by means of Monte Carlo simulations. The thermal variation of the exchange and coercive fields are in good qualitative agreement with previous experimental results on NiFe/NiMn bilayers. The blocking temperature distribution is determined by reproducing the experimental procedure based on an annealing. Then, it is evidenced that, by taking into account a decrease of the magnetization at low-temperature, at the F/AF interface in some of the AF grains, leads to the observation of the unusual low-T peak in the distribution.
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