Complex magnetic interactions in off-stoichiometric NiMnGa alloys
2010 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 22, no 34, 346001- p.Article in journal (Refereed) Published
Using first-principles density functional theory, the magnetic pair interactions between various pairs of chemical specie have been calculated and the trends in magnetism with varying compositions and chemical ordering are analyzed for three off-stoichiometric NiMnGa alloys in their austenite phases. The experimentally observed trend of decreasing magnetization with increasing Mn concentration is attributed to the antiferromagnetic interactions among Mn atoms occupying sublattices other than the original Mn one. The role of chemical ordering on magnetization is also analyzed by total energy results and exchange interactions. We are able to explain the recently published neutron scattering experiments with our theoretical analyses.
Place, publisher, year, edition, pages
2010. Vol. 22, no 34, 346001- p.
IdentifiersURN: urn:nbn:se:uu:diva-134968DOI: 10.1088/0953-8984/22/34/346001ISI: 000280847200024OAI: oai:DiVA.org:uu-134968DiVA: diva2:375065