Temperature dependence of semi-hard iron silicide rare-earth free magnet.

Searching for rare-earth free permanent magnet attracts extensive research interests due to diverse technological applications and other subtle issues. Here, the temperature dependent magnetic properties of FeSiC structure are explored. The FeSiC has a critical temperature of 710 K with perpendicular magnetic anisotropy. The magnetic anisotropy constant and coercive field are monotonically decreased with increasing temperature. For instance, the magnetic anisotropy constant is 0.42 MJ mat zero Kelvin and reduced to 0.24 MJ mand 0.06 MJ mat 300 K and 600 K. The coercive field becomes 0.7 T at 0 K. With increasing the temperatures, it is suppressed to 0.42 T and 0.20 T at 300 K and 600 K, respectively. Overall, the FeSiC system has a (BH)of 417 kJ mat zero Kelvin. The (BH)is decreased at high temperature. Nonetheless, we obtain the (BH)of 234 kJ mat 300 K. Since the FeSiC shows better permanent magnetic (PM) property than the conventional ferrites and also CeCo. This finding may indicate that the FeSiC can be a potential candidate as a Fe-based gap PM between ferrite and Nd-Fe-B (or Sm-Co) at room temperature.