Sm–Co–Cu–Ti high-temperature permanent magnets

Authors

Jian Zhou, University of Nebraska - Lincoln
Ralph Skomski, University of Nebraska-LincolnFollow
C. Chen, Electron Energy Corporation, Landisville, Pennsylvania
George C. Hadjipanayis, University of DelawareFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

9-4-2000

Comments

Published by American Institute of Physics. Appl. Phys. Lett. 77, 1514 (2000). ©2000 American Institute of Physics. Permission to use. http://apl.aip.org/jap/.

Abstract

A class of promising permanent-magnet materials with an appreciable high-temperature coercivity of 8.6 kOe at 500 °C is reported. The Sm–Co–Cu–Ti magnets are prepared by arc melting and require a suitable heat treatment. Magnetization measurements as a function of temperature and x-ray diffraction patterns indicate that the samples are two-phase mixtures of 2:17 and 1:5 structures. Depending on heat treatment and composition, some of the magnets exhibit a positive temperature coefficient of coercivity. The promising high-temperature behavior of the coercivity is ascribed to the temperature dependence of the domain-wall energy, which affects the curvature of the walls and the pinning behavior.