This title appears in the Scientific Report :
2011
Please use the identifier:
http://dx.doi.org/10.1088/0022-3727/44/23/235001 in citations.
Variation of the magnetic properties of Ni2MnGa Heusler alloy upon tetragonalization: a first-principles study
Variation of the magnetic properties of Ni2MnGa Heusler alloy upon tetragonalization: a first-principles study
We study the influence of the tetragonalization occurring during the martensitic phase transition on the exchange interactions in Ni2MnGa Heusler alloy using first-principles calculations in conjunction with the frozen-magnon approximation. We show that the tetragonalization alters only the exchange...
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Personal Name(s): | Galanakis, I. |
---|---|
Sasioglu, E. | |
Contributing Institute: |
Quanten-Theorie der Materialien; IAS-1 Quanten-Theorie der Materialien; PGI-1 |
Published in: | Journal of physics / D, 44 (2011) S. 235001 |
Imprint: |
Bristol
IOP Publ.
2011
|
Physical Description: |
235001 |
DOI: |
10.1088/0022-3727/44/23/235001 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Journal of Physics D - Applied Physics
44 |
Subject (ZB): | |
Publikationsportal JuSER |
We study the influence of the tetragonalization occurring during the martensitic phase transition on the exchange interactions in Ni2MnGa Heusler alloy using first-principles calculations in conjunction with the frozen-magnon approximation. We show that the tetragonalization alters only the exchange constants characterizing the Mn-Mn interactions. Calculated Curie temperatures within the random-phase approximation are found to agree with experimental data. Moreover, we study the temperature dependence of the magnetization and the small deviation from the experimental data exactly at the temperature of the phase transition is discussed. Obtained results agree with previous theoretical results using Liechtenstein's formula to calculate the exchange constants and the Monte Carlo simulation technique to estimate the Curie temperature. |