The complementary nature of the exchange-bias field and coercivity enhancement in ferromagneic (F) antiferromagnetic (AF) exchange-coupled layer systems is explained based on an extended Fulcomer & Charap's model, in which the directional distribution of the easy axes plays a decisive role in governing the magnetization behaviors. The model was further extended to deal with the AF-layer thickness ranging from zero to infinity, taking into account of Neel's spin-fanning model. A comprehensive explanation of the influence of exchange coupling on the magnetization behavior of the F-layer is given. It is shown that a rotational magnetzation process is inherent for the samples in which the exchange coupling effect is dominant. Varieties of phenomena are mostly ascribed to the existence of distribution in the magnetic properties, net spin moment at the AF-grain surface and AF-grain size.
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Fujiwara et al. (1999) studied this question.
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