Journal
APPLIED PHYSICS LETTERS
Volume 111, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5000450
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Funding
- National High Technology Research and Development Program of China (863 Program) [2015AA034101]
- National Natural Science Foundation of China [51471030, 51731005, 51527801]
- State Key Laboratory for Advanced Metals and Materials [2016-T01]
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High-performance magnetocaloric materials should have a large reversible magnetocaloric effect and good heat exchange capability. Here, we developed a Ni48.1Co2.9Mn35.0In14.0 metamagnetic shape memory microwire with a large and reversible inverse magnetocaloric effect. As compared to the bulk counterpart, the microwire shows a better combination of magnetostructural transformation parameters (magnetization difference across transformation Delta M, transformation entropy change Delta S-tr, thermal hysteresis Delta T-hys, and transformation interval Delta T-int) and thus greatly reduced critical field required for complete and reversible magnetic-field-induced transformation. A strong and reversible metamagnetic transition occurred in the microwire, which facilitates the achievement of large reversible magnetoresponsive effects. Consequently, a large and reversible magnetic-field-induced entropy change Delta S-m of 12.8 J kg(-1) K-1 under 5 T was achieved in the microwire, which is the highest value reported heretofore in Ni-Mn-based magnetic shape memory wires. Furthermore, since microwires have a high surface/volume ratio, they exhibit very good heat exchange capability. The present Ni48.1Co2.9Mn35.0In14.0 microwire shows great potential for magnetic refrigeration. This study may stimulate further development of high-performance magnetocaloric wires for high-efficiency and environmentally friendly solid-state cooling. Published by AIP Publishing.
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