Large magneto-chemical-elastic coupling in highly magnetostrictive Fe-Ga alloys
2013 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 103, no 23, 231903- p.Article in journal (Refereed) Published
The strong softening of the tetragonal shear elastic constant (C') is the main reason for the second magnetostriction peak observed in Fe100-xGax alloys. Here, we study the coupling between chemical order and magnetism with the aim to understand the origin of the elastic softening. We demonstrate that C' strongly depends on the degree of order of Ga atoms in alpha-Fe. The B-2 type ordering proves to have an important role on the elastic softening for x < 19%, whereas the extreme shear lattice softening and the anomalous temperature dependence of C' are found to be due to the strong magnetochemical coupling in the DO3 phase.
Place, publisher, year, edition, pages
2013. Vol. 103, no 23, 231903- p.
Chemical order, Degree of order, Elastic softening, Fe-Ga alloy, Shear elastic constants, Temperature dependence
Other Physics Topics
IdentifiersURN: urn:nbn:se:kth:diva-140150DOI: 10.1063/1.4838657ISI: 000328634900024ScopusID: 2-s2.0-84889823587OAI: oai:DiVA.org:kth-140150DiVA: diva2:689113
FunderSwedish Research CouncilEU, European Research Council, 228074
QC 201401202014-01-202014-01-172015-06-16Bibliographically approved