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Interaction of phase transformation and magneto- and elastocaloric properties of Heusler alloys

Published online by Cambridge University Press:  05 June 2013

Peter Entel ,
Vladimir V. Sokolovskiy ,
Vasiliy D. Buchelnikov ,
Denis Comtesse  and
Mehmet Acet
Peter Entel
Affiliation:
Faculty of Physics and CENIDE, University of Duisburg-Essen, 47048 Duisburg, Germany
Vladimir V. Sokolovskiy
Affiliation:
Chelyabinsk State University 454001 Chelyabinsk, Russia National University of Science and Technology ‘MISiS’, 119049, Moscow, Russia
Vasiliy D. Buchelnikov
Affiliation:
Chelyabinsk State University 454001 Chelyabinsk, Russia
Denis Comtesse
Affiliation:
Faculty of Physics and CENIDE, University of Duisburg-Essen, 47048 Duisburg, Germany
Mehmet Acet
Affiliation:
Faculty of Physics and CENIDE, University of Duisburg-Essen, 47048 Duisburg, Germany
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Abstract

The structural, electronic and magnetic properties of functional Ni-Mn-(Ga, In, Sn) and Pt-Ni-(Ga, Sn) alloys are studied by first-principles and Monte Carlo tools. The ab initio calculations give a basic understanding of the underlying physics which is associated with the complex magnetic behavior arising from the competition of ferro- and antiferromagnetic interactions for excess Mn atoms in the unit cell. We show that the resulting complex magnetic ordering is the driving mechanism of structural transformations and multifunctional properties of Heusler alloys associated with magnetic shape-memory, magnetocaloric and elastocaloric effects. The thermodynamic properties can be calculated by using the ab initio magnetic exchange parameters in finite-temperature Monte Carlo simulations. Entropy and specific heat changes associated with the magnetic changes and emergence of microstructure across the magnetostructural transition are pointed out. We show how to optimize the functional properties by tuning the compositional changes, for example, a magnetic shape-memory effect of more than 14% can be achieved in Pt-Ni-Mn-Ga alloys. The theoretical studies are accompanied by experimental investigations.

Keywords

magnetic propertiesstructuralalloy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1581: Symposium CCC – Novel Functionality by Reversible Phase Transformation , 2013 , mrss13-1581-ccc01-06
Copyright
Copyright © Materials Research Society 2013 

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References

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