Composition-dependent magnetic response properties of Mn1-xFexGe alloys

Mankovsky, S.; Wimmer, S.; Polesya, S. und Ebert, H. (2018): Composition-dependent magnetic response properties of Mn1-xFexGe alloys. In: Physical Review B, Bd. 97, Nr. 2, 24403

Abstract

The composition-dependent behavior of the Dzyaloshinskii-Moriya interaction (DMI), the spin-orbit torque (SOT), as well as anomalous and spin Hall conductivities of Mn1-xFexGe alloys have been investigated by first-principles calculations using the relativistic multiple scattering Korringa-Kohn-Rostoker (KKR) formalism. The D-xx component of the DMI exhibits a strong dependence on the Fe concentration, changing sign at x approximate to 0.85 in line with previous theoretical calculations as well as with experimental results demonstrating the change of spin helicity at x approximate to 0.8. A corresponding behavior with a sign change at x approximate to 0.5 is predicted also for the Fermi-sea contribution to the SOT, because this is closely related to the DMI. In the case of anomalous and spin Hall effects it is shown that the calculated Fermi-sea contributions are rather small and the composition-dependent behavior of these effects are determined mainly by the electronic states at the Fermi level. The spin-orbit-induced scattering mechanisms responsible for both these effects suggest a common origin of the minimum of the anomalous Hall effect and the sign change of the spin Hall effect conductivities.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Chemie und Pharmazie > Department Chemie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 2469-9950
• Sprache: Englisch