Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 35: Skyrmions III (joint session MA/TT/KFM)
MA 35.11: Talk
Wednesday, March 14, 2018, 17:30–17:45, EB 301
Isolated skyrmions with vanishing anisotropy in Co/Ru(0001) — •Marie Böttcher1,2, Marie Hervé3, Jairo Sinova1,4, Wulf Wulfhekel3, and Bertrand Dupé1 — 1Johannes Gutenberg-Universität Mainz, Mainz, Germany — 2Graduate School Materials Science in Mainz, Mainz, Germany — 3Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 4Academy of Sciences of the Czech Republic, Praha, Czech Republic
Magnetic skyrmions are localized and topologically stabilized non-collinear spin structures. They offer attractive perspectives for future spintronics applications, because they can be manipulated at lower current densities than domain walls [1]. The stabilization of skyrmions is usually attributed to a large Dzyaloshinskii-Moriya interaction (DMI). Here, we show that a strong DMI is not a necessary condition to obtain skyrmions in ultra-thin films. Co/Ru(0001) possesses a spin spiral ground state, although the DMI is weak. We attribute the stability of this spin texture to the simultaneous vanishing of anisotropy [2]. We determine the B-T phase diagram for this system using Monte Carlo simulations and show the magnetic field dependence of isolated skyrmions at magnetic fields with a ferromagnetic ground state. [1] A. Fert, et al. Nature Nano. 8, 152 (2013). [2] M. Hervé et al. arXiv:1707.08519 (2017)