Abstract

We have investigated the FeMn thickness dependence of the exchange bias in the Py/FeMn/Py structure. The exchange biases of lower and upper Py layers show a difference in strength. The exchange bias of the lower Py is larger than that of the upper Py. The coercivity of the upper Py is larger than that of the lower Py. There are qualitative differences in MFM images according to the strength of exchange bias. The pinning points of MFM images are strongly related with the magnitude of exchange bias and coercivity is a less important parameter.

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