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Magnetocaloric and magnetic properties of Ni2Mn1−xCuxGa Heusler alloys: An insight from the direct measurements and ab initio and Monte Carlo calculations

Sokolovskiy, V. and Buchelnikov, V. and Skokov, K. and Gutfleisch, O. and Karpenkov, D. and Koshkid'ko, Yu. and Miki, H. and Dubenko, I. and Ali, N. and Stadler, S. and Khovaylo, V. (2013):
Magnetocaloric and magnetic properties of Ni2Mn1−xCuxGa Heusler alloys: An insight from the direct measurements and ab initio and Monte Carlo calculations.
114, In: Journal of Applied Physics, (18), AIP Publishing LLC, p. 183913, ISSN 00218979, [Online-Edition: http://dx.doi.org/10.1063/1.4826366],
[Article]

Abstract

We calculated magnetic exchange constants and magnetocaloric properties of Ni2Mn1-xCuxGa Heusler alloys by ab initio and Monte Carlo methods. The ab initio study of the influence of the Cu excess x on the strength of magnetic interactions revealed that Cu weakens Mn-Ni interaction and has a complex impact on the Mn-Mn interactions. Theoretically calculated magnetic phase diagram of Ni2Mn1-xCuxGa is in a good agreement with available experimental data. Calculated by the Monte Carlo method the isothermal magnetic entropy change ΔSmag in a Ni2Mn0.75Cu0.25Ga alloy is significantly smaller around the coupled magnetostructural phase transition temperature than the reported earlier experimental ΔSmag. This discrepancy is ascribed to an overestimation of the experimental ΔSmag at the magnetostructural phase transition. Theoretically determined adiabatic temperature change ΔTad in Ni2Mn0.75Cu0.25Ga agrees well with ΔTad measured experimentally by a direct method.

Item Type: Article
Erschienen: 2013
Creators: Sokolovskiy, V. and Buchelnikov, V. and Skokov, K. and Gutfleisch, O. and Karpenkov, D. and Koshkid'ko, Yu. and Miki, H. and Dubenko, I. and Ali, N. and Stadler, S. and Khovaylo, V.
Title: Magnetocaloric and magnetic properties of Ni2Mn1−xCuxGa Heusler alloys: An insight from the direct measurements and ab initio and Monte Carlo calculations
Language: English
Abstract:

We calculated magnetic exchange constants and magnetocaloric properties of Ni2Mn1-xCuxGa Heusler alloys by ab initio and Monte Carlo methods. The ab initio study of the influence of the Cu excess x on the strength of magnetic interactions revealed that Cu weakens Mn-Ni interaction and has a complex impact on the Mn-Mn interactions. Theoretically calculated magnetic phase diagram of Ni2Mn1-xCuxGa is in a good agreement with available experimental data. Calculated by the Monte Carlo method the isothermal magnetic entropy change ΔSmag in a Ni2Mn0.75Cu0.25Ga alloy is significantly smaller around the coupled magnetostructural phase transition temperature than the reported earlier experimental ΔSmag. This discrepancy is ascribed to an overestimation of the experimental ΔSmag at the magnetostructural phase transition. Theoretically determined adiabatic temperature change ΔTad in Ni2Mn0.75Cu0.25Ga agrees well with ΔTad measured experimentally by a direct method.

Journal or Publication Title: Journal of Applied Physics
Volume: 114
Number: 18
Publisher: AIP Publishing LLC
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: 10 Mar 2014 10:03
Official URL: http://dx.doi.org/10.1063/1.4826366
Identification Number: doi:10.1063/1.4826366
Funders: This work was supported by RFBR grant Nos. 11-02-00601 and 12-02-31129, RF President Grant MK-6278.2012.2, DFG (SPP 1599), the U.S. Department of Energy (Grant No. DE-FG02-06ER46291), and the Creation and Development Program of NUST “MIS&S.”, Part of the work was carried out under the Collaborative Research Project of the Institute of Fluid Science, Tohoku University.
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