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

Zhou, J.; Skomski, R.; Chen, C.; Hadjipanayis, G. C.; Hadjipanayis, G.C.; Sellmyer, D. J.; Sellmyer, D.J.
September 2000
Applied Physics Letters;9/4/2000, Vol. 77 Issue 10
Academic Journal
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. © 2000 American Institute of Physics.


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