Sokolovskiy, V. ; Buchelnikov, V. ; Skokov, K. ; Gutfleisch, O. ; Karpenkov, D. ; Koshkid'ko, Yu. ; Miki, H. ; Dubenko, I. ; Ali, N. ; Stadler, S. ; 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.
In: Journal of Applied Physics, 114 (18)
doi: 10.1063/1.4826366
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Sokolovskiy, V. ; Buchelnikov, V. ; Skokov, K. ; Gutfleisch, O. ; Karpenkov, D. ; Koshkid'ko, Yu. ; Miki, H. ; Dubenko, I. ; Ali, N. ; Stadler, S. ; Khovaylo, V. |
| Art des Eintrags: | Bibliographie |
| Titel: | Magnetocaloric and magnetic properties of Ni2Mn1−xCuxGa Heusler alloys: An insight from the direct measurements and ab initio and Monte Carlo calculations |
| Sprache: | Englisch |
| Publikationsjahr: | November 2013 |
| Verlag: | AIP Publishing LLC |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Applied Physics |
| Jahrgang/Volume einer Zeitschrift: | 114 |
| (Heft-)Nummer: | 18 |
| DOI: | 10.1063/1.4826366 |
| Kurzbeschreibung (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. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 10 Mär 2014 10:03 |
| Letzte Änderung: | 10 Mär 2014 10:03 |
| PPN: | |
| Sponsoren: | 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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