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The effect of distributed exchange parameters on magnetocaloric refrigeration capacity in amorphous and nanocomposite materials

Opened Access The effect of distributed exchange parameters on magnetocaloric refrigeration capacity in amorphous and nanocomposite materials

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Autor: Ipus Bados, Jhon Jairo
Jones, N. J.
Ucar, H.
McHenry, M. E.
Laughlin, D. E.
Departamento: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Fecha: 2012-02-17
Publicado en: Journal of Applied Physics, 111,  07A334
Tipo de documento: Artículo
Resumen: The temperature dependent magnetization of nanocomposite alloys has been fit with a modified Handrich-Kobe equation with an asymmetric exchange fluctuation parameter combined with the Arrott-Noakes equation. The two equations of state are combined to calculate the entropy change in the magnetocaloric effect associated with the ferromagnetic to paramagnetic phase transformation. The complete fit for the M(T) of (Fe70Ni30)88Zr7B4Cu nanocomposite powder is accomplished by combining the two theories. We investigate the broadening of the second-order transition arising from asymmetric exchange parameters and resulting from the fluctuations of interatomic spacing found in an amorphous matrix and the asymmetric dependence of exchange energy on interatomic spacing. The magnetic entropy curve revealed extra broadening with a refrigeration capacity (RC) value of 135 J/kg at 5 T, which is comparable to (Fe76Cr8-xMoxCu1B15) ribbons, which have a RC value of 180 J/kg for the same applied field. Br...
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Tamaño: 567.1Kb
Formato: PDF

URI: http://hdl.handle.net/11441/33786

DOI: http://dx.doi.org/10.1063/1.3679456

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