High-temperature magnetic properties of mechanically alloyed SmCo ₅ and YCo₅ magnets

Authors

I.A. Al-Omari, University of Nebraska - Lincoln
Ralph Skomski, University of Nebraska-LincolnFollow
R.A. Thomas, University of Nebraska - Lincoln
D. Leslie-Pelecky, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

7-1-2001

Comments

Published by IEEE; IEEE Trans. Mag. 37, 2534 (2001). ©2001 IEEE. Permission to use. http://ieeexplore.ieee.org/

Abstract

The high-temperature coercivity of mechanically alloyed and subsequently annealed RCo₅ (R=Sm and Y) is studied. The annealed materials have the hexagonal CaCu₅ structure with 2 : 17 (or 1 : 7) regions as a minor phase. High-temperature magnetic measurements showthat the coercivities of materials decrease with increasing temperature fromroom-temperature to 873 K, but that the temperature coefficient of the coercivity of YCo₅ is much smaller than that of SmCo₅. This behavior is explained in terms of the intrinsic temperature variation of the magnetocrystalline anisotropy.