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A unified approach to describe the thermal and magnetic hysteresis in Heusler alloys

Blázquez, J. S. and Franco, V. and Conde, A. and Gottschall, T. and Skokov, K. P. and Gutfleisch, O. (2016):
A unified approach to describe the thermal and magnetic hysteresis in Heusler alloys.
In: Applied Physics Letters, AIP Publishing, p. 122410, 109, (12), ISSN 0003-6951,
[Online-Edition: http://dx.doi.org/10.1063/1.4963319],
[Article]

Abstract

Different excitations, like temperature, magnetic field, or pressure, can drive a martensitic transition in Heusler alloys. Coupled phenomena in these materials lead to interesting magnetocaloric and barocaloric effects ascribed to this transition. In this work, we demonstrate that isothermal transformations induced by a magnetic field and isofield transformations induced by the temperature can be described using the same framework. By defining an effective temperature that relates field and temperature through the properties of the system (magnetic moment and entropy of the transition), both kinds of loops can be transformed into the other kind, therefore providing a more effective way of characterizing hysteretic samples. The validity of this effective temperature approach to describe the transition holds for martensite to austenite transformations as well as reversal ones, and thus, the hysteresis phenomena can be described using this single general excitation.

Item Type: Article
Erschienen: 2016
Creators: Blázquez, J. S. and Franco, V. and Conde, A. and Gottschall, T. and Skokov, K. P. and Gutfleisch, O.
Title: A unified approach to describe the thermal and magnetic hysteresis in Heusler alloys
Language: English
Abstract:

Different excitations, like temperature, magnetic field, or pressure, can drive a martensitic transition in Heusler alloys. Coupled phenomena in these materials lead to interesting magnetocaloric and barocaloric effects ascribed to this transition. In this work, we demonstrate that isothermal transformations induced by a magnetic field and isofield transformations induced by the temperature can be described using the same framework. By defining an effective temperature that relates field and temperature through the properties of the system (magnetic moment and entropy of the transition), both kinds of loops can be transformed into the other kind, therefore providing a more effective way of characterizing hysteretic samples. The validity of this effective temperature approach to describe the transition holds for martensite to austenite transformations as well as reversal ones, and thus, the hysteresis phenomena can be described using this single general excitation.

Journal or Publication Title: Applied Physics Letters
Volume: 109
Number: 12
Publisher: AIP Publishing
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 12:18
Official URL: http://dx.doi.org/10.1063/1.4963319
Identification Number: doi:10.1063/1.4963319
Funders: This work was supported by MINECO and EU FEDER (Project No. MAT2013-45165-P) and the PAI of the Regional Government of Andalucía., V. Franco also acknowledges funding from the Deutscher Akademischer Austauschdienst DAAD (Award No. A/13/09434)., T. Gottschall and O. Gutfleisch acknowledge funding from the DFG (SPP1599).
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