Helicity and size dependence of skyrmions in Mn$_{1-x}$Fe$_x$Ge mediated by the Dzyaloshinskii-Moriya interaction

ORAL

Abstract

We carry out first-principles electronic structure calculations for bulk alloys of Mn$_{1-x}$Fe$_x$Ge and MnSi in the B20 compound where skyrmions are seen to vary in size and chiral order. We utilize the Virtual Crystal Approximation to vary the concentration of Fe/Mn atoms within the unit cell. Using a first order perturbation approach with spin-orbit coupling applied to spin-spiral calculations we observe the Dzyaloshinski-Moriya vector changes sign and magnitude with the concentration of the transition metal ion.

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Authors

  • Jacob Gayles

    • Department of Physics \& Astronomy, Texas A\&M University, College Station, Texas 77843-4242, USA

  • Frank Freimuth

    • Peter Gr{\"u}nberg Institut \& Institute for Advanced Simulation, Forschungszentrum J{\"u}lich and JARA, 52425 J{\"u}lich, Germany

  • Giovanna Lani

    • Peter Gr{\"u}nberg Institut \& Institute for Advanced Simulation, Forschungszentrum J{\"u}lich and JARA, 52425 J{\"u}lich, Germany

  • Rembert Duine

    • Institute for Theoretical Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands

  • Jairo Sinova

    • Department of Physics \& Astronomy, Texas A\&M University, College Station, Texas 77843-4242, USA

  • Yuriy Mokrousov

    • Peter Gr{\"u}nberg Institut \& Institute for Advanced Simulation, Forschungszentrum J{\"u}lich and JARA, 52425 J{\"u}lich, Germany

  • Stefan Bl{\"u}gel

    • Peter Gr{\"u}nberg Institut \& Institute for Advanced Simulation, Forschungszentrum J{\"u}lich and JARA, 52425 J{\"u}lich, Germany