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The magnetocaloric effect and critical behavior in amorphous Gd 60Co 40-xMn x alloys.

Opened Access The magnetocaloric effect and critical behavior in amorphous Gd 60Co 40-xMn x alloys.

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Autor: Franco García, Victorino
Zheng, Zhigang
Zhong, Xichun
Yu, Hongya
Liu, Zhongwu
Zeng, Dechang
Departamento: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Fecha: 2012
Publicado en: Journal of Applied Physics, 111 (07A922)
Tipo de documento: Artículo
Resumen: 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.
Tamaño: 1.075Mb
Formato: PDF

URI: http://hdl.handle.net/11441/33493

DOI: http://dx.doi.org/10.1063/1.3673860

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