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The evolutionary process of the anisotropic magnetoresistance from the positive to the negative by changing the field direction was observed in magnetic thin films of Ni-Co, Ni-Fe and Co. Various peculiar magnetoresistance-field curves occur, that can be understood by a model based on the superposition of the positive and negative magnetoresistance with different amplitudes and phases.
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Zhao et al. (1997) studied this question.
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