Weak exchange effect and large refrigerant capacity in a bulk metallic glass Gd0.32Tb0.26Co0.20Al0.22

Yongsheng Liu; Jincang Zhang; Youquan Wang; Yanyan Zhu; Zhenglong Yang; Jing Chen; Shixun Cao
March 2009
Applied Physics Letters;3/16/2009, Vol. 94 Issue 11, p112507
Academic Journal
The magnetic behavior and refrigeration capacity of Gd0.32Tb0.26Co0.20Al0.22, a bulk metallic glass (BMG) fabricated by a copper-mold suck-casting method, are investigated. The Curie temperature increases from 79 K at 200 Oe to 95 K at 50 000 Oe. A weak exchange field of 25 T in the BMG system, caused by the strong disorder, is derived by the mean-field approximation. The maximum magnetic entropy change (8.02 J kg-1 K-1) and the refrigerant capacity (642 J kg-1) for 5 T indicate the BMG has the better refrigerant efficiency compared to known magnetic refrigerants.


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