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The influence of Co addition on the magnetocaloric effect of Nanoperm-type amorphous alloys

 

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Opened Access The influence of Co addition on the magnetocaloric effect of Nanoperm-type amorphous alloys
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Author: Conde Amiano, Alejandro
Franco García, Victorino
Blázquez Gámez, Javier Sebastián
Department: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Date: 2006-09-22
Published in: Journal of Applied Physics, 100,  064307
Document type: Article
Abstract: The effect of Co addition on the magnetocaloric effect of amorphous alloys with Nanoperm-type composition has been studied for temperatures above room temperature. Co addition produces an increase in the maximum magnetic entropy change and a shift of its associated temperature to higher temperatures. The maximum refrigerant capacity (RC) value obtained in this study is 82 J kg−1 for a maximum applied field H = 15 kOe. This value is �30% larger than that of a Mo-containing Finemet-type alloy measured under the same experimental conditions. However, the RC of the alloys, when calculated from temperatures corresponding to the half-maximum entropy change value, deteriorates with the presence of Co in the alloy. The field dependence of the magnetic entropy change has also been analyzed, showing a power dependence for all the magnetic regimes of the samples. This field dependence at the Curie temperature deviates from mean field predictions.
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URI: http://hdl.handle.net/11441/33387

DOI: http://dx.doi.org/10.1063/1.2337871

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