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Large magnetocaloric effect and enhanced magnetic refrigeration in ternary Gd-based bulk metallic glasses

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6 Author(s)
Du, J. ; Shenyang National Laboratory for Materials Science, Institute of Metal Research, and International Center for Materials Physics, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, People’s Republic of China ; Zheng, Q. ; Li, Y.B. ; Zhang, Q.
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The magnetocaloric effect and refrigeration capacity (RC) of Gd55Co20Al25 and Gd55Ni25Al20 bulk metallic glasses (BMGs) have been investigated. Large magnetic entropy changes ΔSM of 11.2 and 10.8 Jkg-1K-1 and large RC values of 846 and 920 Jkg-1 are obtained for Gd55Co20Al25 and Gd55Ni25Al20, respectively, at a field change of 7 T. The RC value (640 Jkg-1 at 5 T or 920 Jkg-1 at 7 T) of Gd55Ni25Al20 BMG is larger than that reported for all magnetocaloric materials, including crystalline and amorphous materials measured under the same conditions. The large RC value is due to the broad ΔSM peak (more than 100 K), which is caused by the disordered structure of an amorphous material. The large ΔSM and RC values make these Gd-based ternary BMGs attractive candidates for magnetic refrigeration applications.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 2 )

Date of Publication:

Jan 2008

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