Abstract

A system of magnetic materials suited for a room temperature magneto-refrigeration, Gd-Tb-Nd, has been investigated. Samples were melted in an argon-protected high-frequency magnetic induction furnace. Magnetization curves were measured with a vibrating-sample magnetometer, in order to obtain the magnetic entropy change. Experimental results show that the Curie temperature (T c ) of the present system is near room temperature and decreases as the Tb and Nd contents increase. By addition of a small amount of Nd, the magnetic entropy change is comparable with that of Gd-Tb, and the transition temperature changes greatly. Therefore Nd can be used as a working temperature regulator. The Gd-Tb-Nd system is a prospect for realizing a large-scale room-temperature refrigeration in low magnetic fields.

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