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Magnetocaloric effect and critical behavior in melt‐extracted Gd 60 Co 15 Al 25 microwires
Author(s) -
Xing Dawei,
Shen Hongxian,
Jiang Sida,
Liu Jingshun,
Phan ManhHuong,
Wang Huan,
Qin Faxiang,
Chen Dongming,
Liu Yanfen,
Sun Jianfei
Publication year - 2015
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532192
Subject(s) - magnetic refrigeration , materials science , refrigerant , ferromagnetism , critical exponent , paramagnetism , condensed matter physics , liquid nitrogen , atmospheric temperature range , magnetic field , thermodynamics , phase transition , magnetization , chemistry , physics , organic chemistry , gas compressor , quantum mechanics
High‐quality Gd 60 Co 15 Al 25 microwires with an average diameter of 40 µm were successfully fabricated by the melt‐extraction method. The as‐cast microwires undergo a second‐order paramagnetic to ferromagnetic (PM–FM) transition at ∼100 K. Large values of the magnetic entropy change (−Δ S M ∼9.73 J kg −1 K −1 ) and the refrigerant capacity (RC ∼732 J kg −1 ) are achieved for a field change of 5 T. A careful analysis of critical exponents near the PM–FM transition indicates the significant effects of structural disorder on the long‐range ferromagnetic interaction and the magnetocaloric response of the microwires. The excellent magnetocaloric properties make the Gd 60 Co 15 Al 25 microwires very promising for use in magnetic refrigerators operating in the liquid nitrogen temperature range.