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 Fe5SiC structure are explored. The Fe5SiC 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 m(-3) at zero Kelvin and reduced to 0.24 MJ m(-3) and 0.06 MJ m(-3) at 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 Fe5SiC system has a (BH)(max) of 417 kJ m(-3) at zero Kelvin. The (BH)(max) is decreased at high temperature. Nonetheless, we obtain the (BH)(max) of 234 kJ m(-3) at 300 K. Since the Fe5SiC shows better permanent magnetic (PM) property than the conventional ferrites and also CeCo5. This finding may indicate that the Fe5SiC can be a potential candidate as a Fe-based gap PM between ferrite and Nd-Fe-B (or Sm-Co) at room temperature.

Automated summary

This study investigates the temperature-dependent magnetic properties of the Fe5SiC structure. Fe5SiC has a critical temperature of 710K with perpendicular magnetic anisotropy. The magnetic anisotropy constant and coercive field decrease with increasing temperature. Fe5SiC shows better permanent magnetic (PM) property than conventional ferrites and CeCo5, making it a potential candidate for Fe-based gap permanent magnet at room temperature between ferrite and Nd-Fe-B (or Sm-Co).