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Mastering hysteresis in magnetocaloric materials

Gutfleisch, O. and Gottschall, T. and Fries, M. and Benke, D. and Radulov, I. and Skokov, K. P. and Wende, H. and Gruner, M. and Acet, M. and Entel, P. and Farle, M. (2016):
Mastering hysteresis in magnetocaloric materials.
In: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, The Royal Society, p. 20150308, 374, (2074), ISSN 1364-503X,
[Online-Edition: http://dx.doi.org/10.1098/rsta.2015.0308],
[Article]

Abstract

Hysteresis is more than just an interesting oddity that occurs in materials with a first-order transition. It is a real obstacle on the path from existing laboratory-scale prototypes of magnetic refrigerators towards commercialization of this potentially disruptive cooling technology. Indeed, the reversibility of the magnetocaloric effect, being essential for magnetic heat pumps, strongly depends on the width of the thermal hysteresis and, therefore, it is necessary to understand the mechanisms causing hysteresis and to find solutions to minimize losses associated with thermal hysteresis in order to maximize the efficiency of magnetic cooling devices. In this work, we discuss the fundamental aspects that can contribute to thermal hysteresis and the strategies that we are developing to at least partially overcome the hysteresis problem in some selected classes of magnetocaloric materials with large application potential. In doing so, we refer to the most relevant classes of magnetic refrigerants La–Fe–Si-, Heusler- and Fe2P-type compounds.

Item Type: Article
Erschienen: 2016
Creators: Gutfleisch, O. and Gottschall, T. and Fries, M. and Benke, D. and Radulov, I. and Skokov, K. P. and Wende, H. and Gruner, M. and Acet, M. and Entel, P. and Farle, M.
Title: Mastering hysteresis in magnetocaloric materials
Language: English
Abstract:

Hysteresis is more than just an interesting oddity that occurs in materials with a first-order transition. It is a real obstacle on the path from existing laboratory-scale prototypes of magnetic refrigerators towards commercialization of this potentially disruptive cooling technology. Indeed, the reversibility of the magnetocaloric effect, being essential for magnetic heat pumps, strongly depends on the width of the thermal hysteresis and, therefore, it is necessary to understand the mechanisms causing hysteresis and to find solutions to minimize losses associated with thermal hysteresis in order to maximize the efficiency of magnetic cooling devices. In this work, we discuss the fundamental aspects that can contribute to thermal hysteresis and the strategies that we are developing to at least partially overcome the hysteresis problem in some selected classes of magnetocaloric materials with large application potential. In doing so, we refer to the most relevant classes of magnetic refrigerants La–Fe–Si-, Heusler- and Fe2P-type compounds.

Journal or Publication Title: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume: 374
Number: 2074
Publisher: The Royal Society
Uncontrolled Keywords: hysteresis, magnetocalorics, magnetostructural transition
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 24 Oct 2016 07:53
Official URL: http://dx.doi.org/10.1098/rsta.2015.0308
Additional Information:

This article is part of the themed issue ‘Taking the temperature of phase transitions in cool materials’.

Identification Number: doi:10.1098/rsta.2015.0308
Funders: This work has been, in part, funded by the European Community’s 7th Framework Programme under grant agreement no. 310748 ‘DRREAM’ and also the DFG SPP 1599 priority programme., We also want to thank the DFG for financial support in the framework of the Excellence Initiative, Darmstadt Graduate School of Excellence Energy Science and Engineering (GSC 1070).
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