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The Magnetocaloric Composite Designed by Multi‐Gd‐Al‐Co Microwires with Close Performances
Author(s) -
Shen Hongxian,
Luo Lin,
Xing Dawei,
Jiang Sida,
Liu Jingshun,
Huang Yongjiang,
Guo Shu,
Sun Haichao,
Liu Yanfen,
Sun Jianfei,
Phan ManhHuong
Publication year - 2019
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.201900090
Subject(s) - magnetic refrigeration , materials science , composite number , refrigerant , curie temperature , ferromagnetism , condensed matter physics , paramagnetism , amorphous solid , magnetization , magnetic field , thermodynamics , composite material , crystallography , chemistry , physics , quantum mechanics , gas compressor
A new magnetocaloric composite composed of three types of soft ferromagnetic Gd‐based microwires with equal mass ratio and close magnetocaloric performances is designed. The Curie temperatures ( T C ) of these three wires are ≈97, ≈100, and ≈101 K, respectively. However, the magnetization versus temperature curve of the composite sample shows almost a single ferromagnetic–paramagnetic transition at ≈97 K. For a field change of µ 0 Δ H = 5 T, the maximum entropy change ( − Δ S M max ) and refrigerant capacity (RC) of this composite are calculated to be ≈9.98 J kg −1 K −1 and ≈665 J kg −1 , respectively. There is a good agreement between the calculated −Δ S M ( T ) curve and the experimental data, indicating weak magnetic interactions among different wire compositions. Additionally, the calculated universal master curves of the composite and its Gd‐Al‐Co components are fitted very well, which reveals the second‐order type of the magnetic transition for the composite. The designed composite integrates all magnetocaloric properties of its components, suggesting that the Gd‐based amorphous wires with close magnetocaloric properties can be designed as an excellent refrigerant for use in active magnetic refrigerators.