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The structural and magnetic properties of single-crystalline Fe_100- XRh_ X(26 { X} 63)$grown on MgO (100) substrates were systematically studied as a function of composition, temperature and applied magnetic field. The first-order magnetic phase transition of Fe$_{100 - { X}}$Rh$_{{ X}}$was observed with the range of$51 { X} 60$. The temperature dependent magnetization behavior for all the samples under investigation is presented. The transition temperature for the change from anti-ferromagnetic (AFM) to a ferromagnetic (FM) state vary between 70 to 150∘C. The change in entropy,ΔS, estimated by the change in transition temperature with applied magnetic field during cooling process, decreases with increasing X and atX 62, it become zero. The observed hysteresis loop performed P-MOKE shows shaper transition as compared to VSM, indicates that surface magnetization distribution is different from the overall film.
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Inoue et al. (2008) studied this question.
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