The exchange bias properties of a granular system composed of Fe nanoparticles (mean size ~60.3em0exnm) embedded in an Fe oxide matrix have been studied. The effect of the cooling field on the exchange field, coercivity and remanent magnetization at T=50.3em0exK has been investigated. The observed variations are explained in terms of interfacial exchange coupling between a ferromagnetic phase (the Fe particles) and a disordered magnetic phase (the oxide matrix), whose spin configuration is strongly affected by the cooling field.
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Bianco et al. (2004) studied this question.
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