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The shape of magnetoresistance curve is discussed based on the rotation model of magnetization. The magnetoresistance curve exhibits a dip when the magnetic field deviates from the hard direction of magnetization. The deviation of the direction of electric current causes an irreversibility in magnetoresistance curves. These results indicate that the dip and/or irreversibility being independent of the Bulkhausen effect should be taken into account for the explanation of those observed experimentally. An asymmetric magnetoresistance curve observed sometimes in 82Ni-Fe permalloy films is explained by the model with the assumption of magnetic inhomogenity. Also, the shape of magnetoresistance curves observed in Co/Au multilayer films with perpendicular magnetic anisotropy is explained by the model.
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Miyazaki et al. (1990) studied this question.
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