The magnetocaloric effect and critical behavior in amorphous Gd60Co40−xMnx alloys | Zendy

Z.G. Zheng | Zendy; X. C. Zhong | Zendy; Hongya Yu | Zendy; V. Franco | Zendy; Liu Hon | Zendy; D.C. Zeng | Zendy

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The magnetocaloric effect and critical behavior in amorphous Gd60Co40−xMnx alloys

Author(s) -

Z.G. Zheng,

X. C. Zhong,

Hongya Yu,

V. Franco,

Liu Hon,

D.C. Zeng

Publication year - 2012

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.3673860

Subject(s) - magnetic refrigeration , critical exponent , curie temperature , materials science , condensed matter physics , amorphous solid , phase transition , paramagnetism , thermodynamics , melt spinning , critical field , magnetic field , magnetization , ferromagnetism , spinning , chemistry , crystallography , physics , composite material , superconductivity , quantum mechanics

The amorphous alloys Gd60Co40−xMnx (x = 0, 5, 10, 15) were prepared by melt spinning. The Curie temperature,T c, increases monotonously with Mn addition, ranging from 198 K for x = 0 to 205 K for x = 15, while the maximum values of −ΔSM under the applied field change from 0 to 5 T are 7.7, 7.1, 6.2 and 5.4 J·kg−1·K−1 for x = 0, 5, 10, and 15, respectively. All samples undergo a second order ferri-paramagnetic phase transition. The critical behavior around the transitiontemperature is investigated in detail, using both the standard Kouvel-Fisher procedure as well as the study of the field dependence of the magnetocaloric effect. Results indicate that the obtained critical exponents are reliable, and that the present alloys exhibit local magnetic interaction

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