Date of this Version
REPM'12 - Proceedings of the 22nd International Workshop on Rare-Earth Permanent Magnets and their Applications.
Alternative permanent-magnet materials with intermediate performance, such as K1 ≥ 1 MJ/m3, are investigated experimentally. Our focus is on the structural and magnetic properties of bulk YCo5-xFex and on rare-earth-free transition-metal alloys such as TMxCo100-x (TM = Zr, Hf). YCo5-xFex alloys (x = 0 to 0.75), which crystallize in the hexagonal CaCu5-type structure, exhibit an improved of anisotropy and magnetization as x increases from 0 to 0.75, but the anisotropy increase is much less pronounced than recent theoretical predictions. ZrxCo100-x and HfxCo100-x exhibit reasonable room-temperature hard-magnetic properties, such as coercivities of 0.10 to 0.28 T and magnetizations of 0.60 to 0.94 T.