Fe-Cr-Co magnets with radial anisotropy were developed by rotating samples in a magnetic aging furnace. The anisotropy is altered by the applied magnetic field strength. The Fe-25 wt. %Cr-12 wt. %Co-0.5 wt. %Ti alloy aged in a magnetic field of 100 Oe yields the magnetic properties of (BH)max=24 kJ m-3 (3 MGOe) and iHc=48 kA m-1 (600 Oe) parallel to radial direction, which are higher than those of (BH)max=7 kJ m-3 (0.9 MGOe), iHc=33 kA m-1, measured parallel to the circumferential direction. The increment of the applied magnetic field over 200 Oe alters the radial anisotropy into a circumferential one. Microstructural studies indicate that the iron-rich phase is elongated parallel to the direction of induced anisotropy. Computations of the magnetic flux distribution in disk samples confirm the experimental observations.
ASJC Scopus subject areas
- Physics and Astronomy(all)