Abstract
With different rare earth substitution, equal-atomic Gd25RE25Co25Al25 (RE = Tb, Dy and Ho) high-entropy glassy alloys were studied in this work. The Curie temperature of the alloy system can be easily tuned from 50 to 73 K with different rare earth substitution, which is corresponding to the change of de Gennes factor. A distinct spin-glass like behavior due to the strong random magnetic anisotropy and exchange frustration below the Curie temperature in each alloy is observed and discussed. The high-entropy glassy alloys exhibit large magnetocaloric effect. Under a magnetic field change of 5 T, the maximum of magnetic entropy change and refrigerant capacity for Gd25Ho25Co25Al25 glassy alloy are 9.78 J kg−1K−1 and 626 J kg−1, respectively. The large magnetocaloric effect makes these high-entropy glassy alloys promising candidates as magnetic refrigerants.
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