Epitaxial strain and composition-dependent magnetic properties of MnxGa1-x alloys
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
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
American Physical Society , 2014. Vol. 90, no 14, 144413- p.
Other Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-156987DOI: 10.1103/PhysRevB.90.144413ISI: 000344019300003ScopusID: 2-s2.0-84908042608OAI: oai:DiVA.org:kth-156987DiVA: diva2:769461
FunderSwedish Research CouncilEU, European Research Council
QC 201412082014-12-082014-12-042016-02-26Bibliographically approved