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Critical behavior and magnetocaloric effect of Gd65Mn35−xGex (x = 0, 5, and 10) melt-spun ribbons

Authors :
J. X. Min
X.C. Zhong
Dechang Zeng
Zongwen Liu
Z.G. Zheng
Source :
Journal of Applied Physics. 112:033903
Publication Year :
2012
Publisher :
AIP Publishing, 2012.

Abstract

Gd65Mn35−xGex (x = 0, 5, 10) alloy ribbons were prepared by melt-spinning. A fully amorphous structure was obtained for the alloys with x = 5 and 10, whereas, in melt-spun Gd65Mn35 ribbons, crystalline phases (α-Gd and GdMn2) precipitate in the amorphous matrix. The magnetic phase transition from ferromagnetic to paramagnetic is second order. The critical exponents are deduced from the Kouvel-Fisher method and scaling behavior. The obtained critical exponents are in agreement with the theoretical values of 3D Ising model. The Ising-like behavior suggests the presence of large anisotropy and short-range magnetic-coupling behavior. The maximum magnetic-entropy changes of the melt-spun alloys with x = 0, 5, and 10 for a magnetic field change from 0 to 5 T are 4.2, 4.1, and 4.5 Jkg−1 K−1, respectively. All three alloys have a broad temperature range of the magnetic-entropy peak, resulting in large refrigerant capacities.

Details

ISSN :
10897550 and 00218979
Volume :
112
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........a408b1467de9399953839d2ccf303977
Full Text :
https://doi.org/10.1063/1.4740062