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Large magneto-chemical-elastic coupling in highly magnetostrictive Fe-Ga alloys
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2013 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 103, no 23, 231903- p.Article in journal (Refereed) Published
Abstract [en]

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.
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Engineering and Technology
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URN: urn:nbn:se:uu:diva-215922DOI: 10.1063/1.4838657ISI: 000328634900024OAI: oai:DiVA.org:uu-215922DiVA: diva2:689112
Available from: 2014-01-20 Created: 2014-01-17 Last updated: 2017-12-06Bibliographically approved

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Johansson, BörjeVitos, Levente

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