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Origin of magnetic frustrations in Fe-Ni Invar alloys
Department of Materials Science and Engineering Royal Institute of Technology, Stockholm.
Institute for Molecules and Materials Radboud University Nijmegen, The Netherlands.
Condensed Matter Theory Group, Department of Physics Uppsala University.
Condensed Matter Theory Group, Department of Physics Uppsala University.
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2005 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 71, no 5, 4402- p.Article in journal (Refereed) Published
Abstract [en]

Pair exchange parameters Jij of the classical Heisenberg Hamiltonian for magnetic interactions in the urchetypical Invar system, face centered cubic (fee) Fe-Ni alloys, are calculated from the first principles. The magnetic structure of Fe-Ni alloys in the region of volumes and electron concentrations related to the Invar effect is highly frustrated. However, the origin of such a frustration in concentrated alloys and in the pure fee Fe are different. While in Fe it is due to the long-range oscillating Jij, in alloys with high Ni concentration it is mainly the consequence of a huge dispersion of the nearest-neighbor exchange parameters, caused by the local environment effects. ©2005 The American Physical Society.

Place, publisher, year, edition, pages
2005. Vol. 71, no 5, 4402- p.
Keyword [en]
Invar; Heisenberg model; spin Hamiltonians; ab initio calculations; frustration; exchange interactions (electron); crystal structure; magnetic structure
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-24455DOI: 10.1103/PhysRevB.71.054402Local ID: 6567OAI: diva2:244774
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2012-02-06

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Abrikosov, Igor
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