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Hysteresis and magnetocaloric effect at the magnetostructural phase transition of Ni-Mn-Ga and Ni-Mn-Co-Sn Heusler alloys

Basso, Vittorio and Sasso, Carlo P. and Skokov, Konstantin P. and Gutfleisch, Oliver and Khovaylo, Vladimir V. (2012):
Hysteresis and magnetocaloric effect at the magnetostructural phase transition of Ni-Mn-Ga and Ni-Mn-Co-Sn Heusler alloys.
In: Physical Review B, American Physical Society, pp. 014430-1, 85, (1), ISSN 1098-0121,
[Online-Edition: http://dx.doi.org/10.1103/PhysRevB.85.014430],
[Article]

Abstract

Hysteresis features of the direct and inverse magnetocaloric effect associated with first-order magnetostructural phase transitions in Ni-Mn-X (X = Ga, Sn) Heusler alloys have been disclosed by differential calorimetry measurements performed either under a constant magnetic field, H, or by varying H in isothermal conditions. We have shown that the magnetocaloric effect in these alloys crucially depends on the employed measuring protocol. Experimentally observed peculiarities of the magnetocaloric effect have been explained in the framework of a model that accounts for different contributions to the Gibbs energy of austenitic gA and martensitic gM phases. Obtained experimental results have been summarized by plotting a phase fraction of the austenite xA versus the driving force gM−gA. The developed approach allows one to predict reversible and irreversible features of the direct as well as inverse magnetocaloric effect in a variety of materials with first-order magnetic phase transitions.

Item Type: Article
Erschienen: 2012
Creators: Basso, Vittorio and Sasso, Carlo P. and Skokov, Konstantin P. and Gutfleisch, Oliver and Khovaylo, Vladimir V.
Title: Hysteresis and magnetocaloric effect at the magnetostructural phase transition of Ni-Mn-Ga and Ni-Mn-Co-Sn Heusler alloys
Language: English
Abstract:

Hysteresis features of the direct and inverse magnetocaloric effect associated with first-order magnetostructural phase transitions in Ni-Mn-X (X = Ga, Sn) Heusler alloys have been disclosed by differential calorimetry measurements performed either under a constant magnetic field, H, or by varying H in isothermal conditions. We have shown that the magnetocaloric effect in these alloys crucially depends on the employed measuring protocol. Experimentally observed peculiarities of the magnetocaloric effect have been explained in the framework of a model that accounts for different contributions to the Gibbs energy of austenitic gA and martensitic gM phases. Obtained experimental results have been summarized by plotting a phase fraction of the austenite xA versus the driving force gM−gA. The developed approach allows one to predict reversible and irreversible features of the direct as well as inverse magnetocaloric effect in a variety of materials with first-order magnetic phase transitions.

Journal or Publication Title: Physical Review B
Volume: 85
Number: 1
Publisher: American Physical Society
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: 26 May 2014 11:58
Official URL: http://dx.doi.org/10.1103/PhysRevB.85.014430
Identification Number: doi:10.1103/PhysRevB.85.014430
Funders: Funding from the European Community’s 7th Framework Programme under Grant No. 214864 (project SSEEC) is acknowledged. , V.V.K. acknowledges the Creation and Development Program of NUST “MISiS” for financial support.
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