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Exchange bias in the two – layer system ferromagnetic – antiferromagnetic with surface phase transition and with closed volume phase transition temperatures

Keywords:

D.O. Rynkov


The temperature dependence of an exchange bias of the ferromagnetic hysteresis loop due to the ferromagnet – antiferromagnet interaction was investigated in the framework of Landau phenomenological phase transition theory. The two-layer system ferromagnet – antiferromagnet with uncompensated surface was considered for the case when the Curie temperature TC is close to and exceeds the Neel temperature TN. Each layer has only one easy axis. They lie in the layer plane and are parallel to each other. In this case one can introduce one-component magnetic order parameter for each layer. The numerical modeling shows: the exchange bias on surface has different scenario of realization: – ferromagnet magnetic moment change sign sharp and in vicinity of interface AFM has domen wall; – ferromagnet magnetic moment change sign sharp and in vicinity of interface AFM has not domen wall. It was found boundary these scenarios
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