Theoretical description of magnetocaloric effect in the shape memory alloy exhibiting metamagnetic behavior

Journal Article · Thu Jan 07 04:00:00 EST 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4939556· OSTI ID:22494850

L'vov, Victor A. ^[1]; Kosogor, Anna ^[1]; Barandiaran, Jose M. ^[2]; Chernenko, Volodymyr A. ^[2]

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1. Institute of Magnetism, Kyiv 03142 (Ukraine)
2. BCMaterials and University of Basque Country, UPV/EHU, Bilbao 48080 (Spain)

A simple thermodynamic theory is proposed for the quantitative description of giant magnetocaloric effect observed in metamagnetic shape memory alloys. Both the conventional magnetocaloric effect at the Curie temperature and the inverse magnetocaloric effect at the transition from the ferromagnetic austenite to a weakly magnetic martensite are considered. These effects are evaluated from the Landau-type free energy expression involving exchange interactions in a system of a two magnetic sublattices. The findings of the thermodynamic theory agree with first-principles calculations and experimental results from Ni-Mn-In-Co and Ni-Mn-Sn alloys, respectively.

• OSTI ID: 22494850
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 1 Vol. 119; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
CURIE POINT
EXCHANGE INTERACTIONS
FREE ENERGY
MAGNETIC PROPERTIES
MARTENSITE
SHAPE MEMORY EFFECT