Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Surface magnetism and magnetic coupling phenomena (joint session MA/O/TT)

TT 6.6: Vortrag

Montag, 1. April 2019, 10:45–11:00, H53

Zero field sub-10 nm skyrmions and antiskyrmions in ultrathin Co films — •Sebastian Meyer1, Stephan von Malottki1, Marco Perini2, André Kubetzka2, Roland Wiesendanger2, Kirsten von Bergmann2, and Stefan Heinze11Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel — 2Department of Physics, University of Hamburg

Non-collinear spin structures such as skyrmions are being intensively studied due to their promise for spintronic devices [1]. For applications it is envisioned to use isolated skyrmions with diameters below 10 nm that are stable at zero magnetic field [2]. Here, we use density functional theory and atomistic spin dynamics simulations [3] to show how we can stabilize magnetic skyrmions and antiskyrmions in ultrathin Co films in zero external magnetic field. In contrast to Co being a ferromagnetic material with a strong exchange stiffness we obtain very large frustration effects in the magnetic interactions of ultrathin Co films which imperatively requires an atomistic spin model. We find that the frustration enhances the energy barriers for skyrmions and antiskyrmions against collapse into the ferromagnetic ground state.

[1] A. Fert, V. Cros, and J. Sampaio, Nat. Nanotech. 8, 152 (2013)

[2] A. Fert, N. Reyren, and V. Cros, Nat. Rev. Mater. 2, 17031 (2017)

[3] S. Haldar, et al., Phys. Rev. B 98, 060413 (2018)

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