Abstract
Magnetization properties were measured for a series of Dy 1− x Sm x Co 2 and Dy 1− x La x Co 2 compounds. It was found that the magnetization lowers when the Dy content decreases in the compounds. In both systems, a metamagnetic transition and first-order magnetic phase transition is observed for certain ranges of the Dy content, and gradually weakens until it disappears as the content of Dy decreases. The magnetic entropy changes | Δ S m | , as a function of the temperature in the magnetic field of 1 T for both series of compounds, have been calculated. Although the | Δ S m | decreases with the decrease of Dy, it does remain fairly large within a certain range of the Dy content. The curie temperature can be adjusted by adjusting x, which indicates that the (Dy 1− x R x )Co 2 (R=Sm, La) compounds may have potential applications as magnetic refrigerants.
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