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Assessment of the magnetocaloric effect in La,Pr(Fe,Si) under cycling

Kaeswurm, B. and Franco, V. and Skokov, K. P. and Gutfleisch, O. (2016):
Assessment of the magnetocaloric effect in La,Pr(Fe,Si) under cycling.
In: Journal of Magnetism and Magnetic Materials, ELSEVIER SCIENCE BV, pp. 259-265, 406, ISSN 03048853,
[Online-Edition: http://dx.doi.org/10.1016/j.jmmm.2016.01.045],
[Article]

Abstract

The response of a magnetocaloric material to periodic variations of magnetic field and temperature corresponding to those occurring during a magnetic refrigeration process is studied. A series of simple measurement protocols are suggested which are used to obtain a value for the cyclic response of the magnetic entropy change associated with the magnetic transition. The entropy values are compared to direct measurements of the temperature change under adiabatic conditions. The procedure is illustrated on the first order magnetocaloric material La0.6Pr0.4Fe11.6Si1.4 and provides a basis for comparison of the suitability of different hysteretic magnetocaloric materials for application in a magnetic refrigerator. For the alloy studied here the peak magnetic entropy change of -28 +/- 11 kg(-1) K-1 in a field change of 2 T is not affected by cycling, but the full width at half maximum of the peak decreases from 8.7 K to 3.8 K. (C) 2016 Elsevier B.V. All rights reserved.

Item Type: Article
Erschienen: 2016
Creators: Kaeswurm, B. and Franco, V. and Skokov, K. P. and Gutfleisch, O.
Title: Assessment of the magnetocaloric effect in La,Pr(Fe,Si) under cycling
Language: English
Abstract:

The response of a magnetocaloric material to periodic variations of magnetic field and temperature corresponding to those occurring during a magnetic refrigeration process is studied. A series of simple measurement protocols are suggested which are used to obtain a value for the cyclic response of the magnetic entropy change associated with the magnetic transition. The entropy values are compared to direct measurements of the temperature change under adiabatic conditions. The procedure is illustrated on the first order magnetocaloric material La0.6Pr0.4Fe11.6Si1.4 and provides a basis for comparison of the suitability of different hysteretic magnetocaloric materials for application in a magnetic refrigerator. For the alloy studied here the peak magnetic entropy change of -28 +/- 11 kg(-1) K-1 in a field change of 2 T is not affected by cycling, but the full width at half maximum of the peak decreases from 8.7 K to 3.8 K. (C) 2016 Elsevier B.V. All rights reserved.

Journal or Publication Title: Journal of Magnetism and Magnetic Materials
Volume: 406
Publisher: ELSEVIER SCIENCE BV
Uncontrolled Keywords: Magnetocaloric effect, Phasetransition, La(FeSi)(13), Ferromagnetism, Entropy change, Adiabatic entropy change
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
Date Deposited: 11 May 2016 12:35
Official URL: http://dx.doi.org/10.1016/j.jmmm.2016.01.045
Identification Number: doi:10.1016/j.jmmm.2016.01.045
Funders: B.K. acknowledges funding from the European Community's Seventh Framework Programme FP 7/2007-2013 under Grant Agreement no. 310748 (DRREAM)., O.G. acknowledges funding from the DFG Priority Program (SPP 1599, GU 514/3-1)., V.F. acknowledges funding from the Deutscher Akademischer Austauschdienst DAAD Award A/13/09434, Spanish MINECO and EU FEDER (Project MAT2013-45165-P), and the PAI of the Regional Government of Andalucia.
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