Abstract
Due to the importance for device applications and also other subtle issues, study on rare-earth free permanent is becoming more and more important subject. Here, we investigate the temperature dependent magnetic characteristics of the Fe3MnC2 structure. We find that the Fe3MnC2 alloy exhibits a critical temperature of 640 K with perpendicular magnetic anisotropy. With increasing temperatures, both the coercive field and the magnetic anisotropy constant monotonically decrease. From temperature dependent magnetization and coercive field, the (BH)max of the Fe3MnC2 system obtained is 396 kJ/m3 at zero Kelvin. The (BH)max suppressed with increasing temperature. Nonetheless, we find the (BH)max of 253 kJ/m3 is at 300 K. Compared with the (BH)max of ferrites and SmCo5, the Fe3MnC2 alloy structure exhibits better permanent magnetic properties. Therefore, we suggest that the Fe3MnC2 could be a suitable candidate for a Fe-based gap permanent magnet between ferrite and Nd-Fe-B (or Sm-Co) at room temperature.
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