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Abstract
A series of Gd60Co40-xFex (x = 0, 5, 10, 15, 20) amorphous ribbons were synthesized by melt-spinning method, and the addition of Fe is detrimental for thermal stability as well as glass forming ability of the alloys. With the increasement of Fe content, the magnetic transition temperature increases firstly and then decreases with the peak of 239 K obtained in Gd60Co30Fe10, while the magnetic entropy change |ΔSM| reduces gradually. This phenomenon is possibly caused by variation of predominant exchange interaction from ferromagnetic to ferrimagnetic. Among these alloys, Gd60Co30Fe10, Gd60Co25Fe15 and Gd60Co20Fe20 represent table-like magnetocaloric effect of 4.4 ± 0.1 Jkg−1K−1, 4.0 ± 0.1 Jkg−1K−1 and 3.8 ± 0.1 Jkg−1K−1 in wide temperature ranges of 201–238 K, 178–228 K and 178–218 K under an applied field H of 5 T, which is probably ascribed to the local structural inhomogeneity in the amorphous matrix. This hypothesis could be confirmed by the deviation of exponent n (|ΔSM| ∝ Hn) and the universal behavior of |ΔSM|-T curves. The present study is expected to enhance the knowledge about the influence of additional elements on magnetocaloric effect and improve the performance of amorphous refrigerants in the Ericsson-cycle near room temperature.
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