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The magnetoresistance and heat treatment dependence of the magnetic phase transition of Fe47Rh53 alloys were studied. A CsCl-type α' phase was obtained by a slow cooling from 900°C to room temperature. During the transition from the ferromagnetic phase (F) to the antiferromagnetic phase (AF), a reversible and negative magnetic field dependence of the resistivity was observed. The granular magnetic structure of F+AF is suggested as one cause of this magnetoresistance, which is similar to the GMR of granular alloys.
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Koike et al. (1996) studied this question.
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