Open AccessExcellent magnetocaloric properties of melt-extracted Gd-based amorphous microwires
Author(s) -
N. S. Bingham,
Hai Wang,
Faxiang Qin,
HuaXin Peng,
Jianfei Sun,
V. Franco,
H. Srikanth,
ManhHuong Phan
Publication year - 2012
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.4751038
Subject(s) - magnetic refrigeration , materials science , amorphous solid , fabrication , refrigerant , magnetic field , cooling capacity , refrigeration , composite material , alloy , condensed matter physics , magnetization , thermodynamics , heat exchanger , crystallography , chemistry , medicine , physics , alternative medicine , pathology , quantum mechanics
We report upon the excellent magnetocaloric properties of Gd53Al24Co20Zr3 amorphous microwires. In addition to obtaining the large magnetic entropy change (-DSM rv 10.3 J/kg K at TC rv 95 K), an extremely large value of refrigerant capacity (RC rv 733.4 J/kg) has been achieved for a field change of 5 T in an array of forty microwires arranged in parallel. This value of RC is about 79% and 103% larger than those of Gd (rv410 J/kg) and Gd5Si2Ge1.9Fe0.1 (rv360 J/kg) regardless of their magnetic ordering temperatures. The design and fabrication of a magnetic bed made of these parallel-arranged microwires would thus be a very promising approach for active magnetic refrigeration for nitrogen liquefaction. Since these microwires can easily be assembled as laminate structures, they have potential applications as a cooling device for micro electro mechanical systems and nano electro mechanical systems
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