Origin of magnetic frustrations in Fe-Ni Invar alloys
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
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.
Invar; Heisenberg model; spin Hamiltonians; ab initio calculations; frustration; exchange interactions (electron); crystal structure; magnetic structure
National CategoryNatural Sciences
IdentifiersURN: urn:nbn:se:liu:diva-24455DOI: 10.1103/PhysRevB.71.054402Local ID: 6567OAI: oai:DiVA.org:liu-24455DiVA: diva2:244774