Presentation Information
[P2-71]temperatuer dependent magnetic properties rare earth free Fe4CoSi permanent magnet
*jisang hong hong1 (1. pukyong national university (Korea))
Keywords:
rare earth free,Fe4CoSi,finite temperature
Developing rare-earth free permanent magnet is attracting extensive research efforts for several device applications
and other issues. Here, we investigate the temperature-dependent magnetic properties of the Fe4CoSi
alloy. The Fe4CoSi alloy shows a high critical temperature of 980 K with perpendicular magnetic anisotropy. At
room temperature, it exhibits a magnetization of 1.44 T, anisotropy constant of 0.8 MJ/m3, and a magnetic
hardness parameter of 0.75. We obtain the (BH)max of 554 kJ/m3 at 0 K, 410 kJ/m3 at 300 K, and 215 kJ/m3 at
600 K without demagnetization effect. Even with a demagnetization factor of 0.3, the Fe4CoSi alloy still possesses
the (BH)max of 268 kJ/m3 at room temperature. The Fe4CoSi exhibits better permanent magnetic properties
compared with ferrites and SmCo5. This may imply that the Fe4CoSi alloy can be a potential Fe-based gap
permanent magnet between ferrite and Nd-Fe-B (or Sm–Co) at room temperature.
and other issues. Here, we investigate the temperature-dependent magnetic properties of the Fe4CoSi
alloy. The Fe4CoSi alloy shows a high critical temperature of 980 K with perpendicular magnetic anisotropy. At
room temperature, it exhibits a magnetization of 1.44 T, anisotropy constant of 0.8 MJ/m3, and a magnetic
hardness parameter of 0.75. We obtain the (BH)max of 554 kJ/m3 at 0 K, 410 kJ/m3 at 300 K, and 215 kJ/m3 at
600 K without demagnetization effect. Even with a demagnetization factor of 0.3, the Fe4CoSi alloy still possesses
the (BH)max of 268 kJ/m3 at room temperature. The Fe4CoSi exhibits better permanent magnetic properties
compared with ferrites and SmCo5. This may imply that the Fe4CoSi alloy can be a potential Fe-based gap
permanent magnet between ferrite and Nd-Fe-B (or Sm–Co) at room temperature.