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Epitaxial strain and composition-dependent magnetic properties of MnxGa1-x alloys
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 90, no 14, 144413- p.Article in journal (Refereed) Published
Abstract [en]

Using first-principles calculation, we have investigated the structural and magnetic properties of MnxGa1-x alloys with Mn content (x) changing from 0.5 to 0.75 in step of x = 0.125. The MnxGa1-x systems crystallize in tetragonal structures, and the tetragonal ratio (c/a) is strongly influenced by chemical composition. The in-plane lattice constants (a) show very weak concentration dependence, but the lattice parameters along the z axis (c) are significantly modified by x. We have found that the magnetic properties of MnxGa1-x alloys are strongly affected by the Mn content and the epitaxial strain. Very interestingly, the magnetocrystalline anisotropy (MCA) of MnxGa1-x alloys follows totally different behaviors with x and epitaxial strain. An especially wide range of MCA values are obtained by straining the Mn0.5Ga0.5 alloy. The spin polarization (at the Fermi level) of Mn0.75Ga0.25 has been calculated from 44% to 57% with epitaxial strain.

Place, publisher, year, edition, pages
2014. Vol. 90, no 14, 144413- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-238573DOI: 10.1103/PhysRevB.90.144413ISI: 000344019300003OAI: oai:DiVA.org:uu-238573DiVA: diva2:772463
Available from: 2014-12-17 Created: 2014-12-14 Last updated: 2017-12-05Bibliographically approved

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Vitos, Levente

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