A simple method for the determination of coercive fields is described. It is based in the comparison between two signals; one proportional to the applied field which excites the sample, and the other proportional to the internal field that acts directly on the magnetization. Coercive fields as low as 0.14 A/m can be reliably measured and the error using this system does not exceed 0.02 A/m.
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Tejedor et al. (1994) studied this question.
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