Journal Article

PreJuSER-17872

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Variation of the magnetic properties of Ni2MnGa Heusler alloy upon tetragonalization: a first-principles study

Galanakis, I. ; Sasioglu, E.FZJ*

2011
IOP Publ. Bristol

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Please use a persistent id in citations: doi:10.1088/0022-3727/44/23/235001

Abstract: 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.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (PGI-1)
2. Quanten-Theorie der Materialien (IAS-1)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2011

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