Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Magnetic textures I
MA 43.8: Vortrag
Donnerstag, 15. März 2018, 11:30–11:45, EB 407
Magnetism of Co monolayer on Pt(111) capped by 5d overlayers — •Eszter Simon1, Levente Rózsa2, Krisztián Palotás3,4, and László Szunyogh1 — 1Budapest University of Technology and Economics, Budapest, Hungary — 2University of Hamburg, Hamburg, Germany — 3Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia — 4University of Szeged, Szeged, Hungary
We study the magnetic properties of a Co monolayer on Pt(111) surface as capped by a monolayer of 5d elements (Re, Os, Ir, Pt and Au) by determining the tensorial exchange interactions and magnetic anisotropies from first principles. We find a close relationship between the magnetic moment of the Co atoms and the nearest-neighbor isotropic exchange interaction due to the electronic hybridization between the Co and the capping layers. All overlayers decrease the magnitude of the Dzyaloshinskii-Moriya (DMI) interaction compared to the Co/Pt(111) system, while even the sign of the DMI changes in case of Ir overlayer [1-3]. We conclude that the variation of the DMI is well correlated with the change of the magnetic anisotropy energy. The unique influence of the Ir overlayer to the DMI is traced by scaling the strength of the spin-orbit coupling of Ir atoms and in terms of the Au1−xIrx/Co/Pt(111) system. Our spin-dynamics simulations indicate that the magnetic ground state for Re/Co/Pt(111) is an elliptic conical spin spiral, while for the other systems it is ferromagnetic.
[1] G. Chen et al., Nat. Comm. 4, 2671 (2013)
[2] A. Hrabec et al., Phys. Rev. B 90, 020402 (2014)
[3] Gy. J. Vida et al., Phys. Rev. B 94, 214422 (2016)