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I am measuring the magnetoresistance of a thin ferromagnetic film from -1T to 1T, it looks something like this - enter image description here

The magnetoresistance increases slightly between 0 and coercivity of the film and then reduces sharply to 1T. Also there is a hysteresis in the measurement done from -1T to 1T and from 1T to -1T, what is the reason for this phenomenon, can someone provide me links of papers to model this?

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