Magnetism of Less Common Cobalt-Rich Alloys

Authors

Bhaskar Das, University of Nebraska-LincolnFollow
Balamurugan Balamurugan, University of Nebraska-LincolnFollow
Wenyong Zhang, University of Nebraska-LincolnFollow
Ralph Skomski, University of Nebraska-LincolnFollow
E. Krage, University of Nebraska-Lincoln
Shah R. Valloppilly, University of Nebraska-LincolnFollow
Jeffrey E. Shield, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

2012

Citation

REPM'12 - Proceedings of the 22nd International Workshop on Rare-Earth Permanent Magnets and their Applications.

Comments

Copyright 2012. Used by permission

Abstract

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 YCo_5-xFe_x and on rare-earth-free transition-metal alloys such as TM_xCo_100-x (TM = Zr, Hf). YCo_5-xFe_x 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. Zr_xCo_100-x and Hf_xCo_100-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.