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

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.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [4] ;  [5]
  1. Institute of Magnetism, Kyiv 03142 (Ukraine)
  2. (Ukraine)
  3. (Russian Federation)
  4. BCMaterials and University of Basque Country, UPV/EHU, Bilbao 48080 (Spain)
  5. (Spain)
Publication Date:
OSTI Identifier:
22494850
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 119; Journal Issue: 1; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AUSTENITE; CURIE POINT; EXCHANGE INTERACTIONS; FREE ENERGY; MAGNETIC PROPERTIES; MARTENSITE; SHAPE MEMORY EFFECT