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A Comparative Study on the Magnetocaloric Properties of Ni-Mn-X(-Co) Heusler Alloys

Taubel, Andreas and Gottschall, Tino and Fries, Maximilian and Riegg, Stefan and Soon, Christopher and Skokov, Konstantin P. and Gutfleisch, Oliver (2018):
A Comparative Study on the Magnetocaloric Properties of Ni-Mn-X(-Co) Heusler Alloys.
In: physica status solidi (b), Wiley-VCH Verlag GmbH, Weinheim, p. 1700331, 255, (2), ISSN 03701972,
DOI: 10.1002/pssb.201700331,
[Online-Edition: https://doi.org/10.1002/pssb.201700331],
[Article]

Abstract

We present a comprehensive study on three selected Heusler alloy systems. Ni-Mn-X(-Co) systems with X=Al, In, Sn are compared with respect to the relevant magnetocaloric properties of their magnetostructural phase transition, namely martensitic transition temperature as well as its field dependence, magnetization change, and width of the thermal hysteresis. The latter one is strongly determining the reversibility of the magnetocaloric effect. Therefore the understanding of how to tailor it by extrinsic and intrinsic factors is of great importance. Our study of the magnetocaloric properties leads to the conclusion that the width of thermal hysteresis can be correlated to the magnetization change of the phase transition. Consequently, the adiabatic temperature change under cycling can largely vary despite similar values of isothermal entropy change for Ni-Mn-In-Co and Ni-Mn-Sn-Co. This result therefore shows the importance of tailoring sharpness, thermal hysteresis, and field dependence of the phase transition to achieve high values for the isothermal entropy change as well as a large magnetocaloric cooling effect in the different Heusler alloys.

Item Type: Article
Erschienen: 2018
Creators: Taubel, Andreas and Gottschall, Tino and Fries, Maximilian and Riegg, Stefan and Soon, Christopher and Skokov, Konstantin P. and Gutfleisch, Oliver
Title: A Comparative Study on the Magnetocaloric Properties of Ni-Mn-X(-Co) Heusler Alloys
Language: English
Abstract:

We present a comprehensive study on three selected Heusler alloy systems. Ni-Mn-X(-Co) systems with X=Al, In, Sn are compared with respect to the relevant magnetocaloric properties of their magnetostructural phase transition, namely martensitic transition temperature as well as its field dependence, magnetization change, and width of the thermal hysteresis. The latter one is strongly determining the reversibility of the magnetocaloric effect. Therefore the understanding of how to tailor it by extrinsic and intrinsic factors is of great importance. Our study of the magnetocaloric properties leads to the conclusion that the width of thermal hysteresis can be correlated to the magnetization change of the phase transition. Consequently, the adiabatic temperature change under cycling can largely vary despite similar values of isothermal entropy change for Ni-Mn-In-Co and Ni-Mn-Sn-Co. This result therefore shows the importance of tailoring sharpness, thermal hysteresis, and field dependence of the phase transition to achieve high values for the isothermal entropy change as well as a large magnetocaloric cooling effect in the different Heusler alloys.

Journal or Publication Title: physica status solidi (b)
Volume: 255
Number: 2
Publisher: Wiley-VCH Verlag GmbH, Weinheim
Uncontrolled Keywords: Heusler alloys, hysteresis, magnetocaloric effect, Ni-Mn-X
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences
Date Deposited: 12 Mar 2018 10:44
DOI: 10.1002/pssb.201700331
Official URL: https://doi.org/10.1002/pssb.201700331
Funders: We acknowledge the financial support by the DFG (Grant No. SPP 1599).
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