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Tuning magnetocaloric effect of Gd–Er–Al–Co metallic glass through crystallization

Original Paper
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Abstract

Magnetization and magnetocaloric effect (MCE) of as-cast Gd-based bulk metallic glass (BMG) Gd24Er32Co24Al20 and the crystallized samples were investigated. Reentrant-spin-glass-like behavior was observed in the as-cast sample. With increasing degree of crystallization, the magnetic frustration increased, which could be seen from the increased divergence of the zero-field-cooled and field-cooled magnetization behavior (i.e., the spin-glass-like freezing behavior). The Curie temperature and magnetization decreased after crystallization. The as-cast BMG showed a large maximum magnetic entropy change (− ΔSm) of 9.9 (J kg−1 K−1) under a field change of 5 T, which was comparable with that of Gd metal and other Gd-based metallic glasses. The maximum − ΔSm reduced to 6.7 (J kg−1 K−1) after crystallization, which was still superior to the Fe-/Co-based amorphous alloys. Their good MCE combining with high electrical resistivity, outstanding mechanical properties, tunable nature, and sufficiently soft magnetic property makes them to be attractive candidate for magnetic refrigerants in the low-temperature range.

Keywords

Metallic glass Magnetocaloric effect Spin glass Crystallization Microstructure 

Notes

Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant Nos. 51371127 and 51274151).

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Copyright information

© China Iron and Steel Research Institute Group 2018

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringTongji UniversityShanghaiChina

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