Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.1: Poster
Dienstag, 2. April 2019, 10:00–13:00, Poster E
Asymmetric Skyrmion Hall Effect in Systems with Hybrid Dzyaloshinskii-Moriya Interaction — Kyoung-Whan Kim1,2, Kyoung-Woong Moon3, Nico Kerber1,4, •Jonas Nothhelfer1, and Karin Everschor-Sitte1 — 1Institute of Physics, JGU Mainz, Germany — 2Center for Spintronics Korea Institute of science and Technology, Korea — 3Spin Convergence Research Team, KRISS Daejeon, Korea — 4Graduate School MAINZ, Staudinger Weg 9, Mainz, Germany
We demonstrate that magnetic skyrmions can move along the direction of a current without showing a skyrmion Hall effect in ferromagnetic thin films that are subject to both structural and bulk inversion asymmetry.[1] In such systems, a hybrid type of the Dzyaloshinskii-Moriya interaction (DMI) arises as a mixture of interfacial and bulk DMIs. We discuss the current-induced skyrmion dynamics and find that the spin-orbit-torque-induced skyrmion Hall angle is asymmetric for the two different skyrmion polarities, even allowing one of them to be tuned to zero. Our results can be understood within a simple picture by using a global spin rotation which maps the hybrid DMI model to an effective model containing purely interfacial DMI. In this sense, the formalism directly reveals the effective spin torque and effective current acting on systems with a hybrid DMI. We propose several experimental ways to achieve the necessary straight skyrmion motion for racetrack memories, even without any interaction with another magnet or an antiferromagnet. [1] K-W. Kim, K-W. Moon, N. Kerber, J. Nothhelfer, K. Everschor-Sitte, Phys. Rev. B 97, 224427 (2018)