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Origin of magnetic frustrations in Fe-Ni Invar alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
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2005 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 71, no 5Article in journal (Refereed) Published
Abstract [en]

Pair exchange parameters J(ij) of the classical Heisenberg Hamiltonian for magnetic interactions in the archetypical Invar system, face centered cubic (fcc) 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 fcc Fe are different. While in Fe it is due to the long-range oscillating J(ij), 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.

Place, publisher, year, edition, pages
2005. Vol. 71, no 5
Keyword [en]
spin dynamics, exchange interactions, ferromagnetic metals, iron, temperature, transition, co, cu
Identifiers
URN: urn:nbn:se:kth:diva-14641DOI: 10.1103/PhysRevB.71.054402ISI: 000228013400047Scopus ID: 2-s2.0-15744369456OAI: oai:DiVA.org:kth-14641DiVA: diva2:332682
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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