Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Poster 1

MA 19.2: Poster

Dienstag, 6. September 2022, 17:30–20:00, P2

Imaging magnetization dynamics in ferromagnetic multilayer systems with Dzyaloshinskii-Moriya interaction, modified by local He+ irradiation — Arne Vereijken¹, Sapida Akhundzada¹, Florian Ott¹, Maxwell Li², Tim Mewes³, Arno Ehresmann¹, Vincent Sokalski², Michael Vogel¹, and •Christian Janzen¹ — ¹Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Kassel, Germany — ²Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, USA — ³Department of Physics and Astronomy, University of Alabama, Tuscaloosa, USA

The Dzyaloshinskii-Moriya interaction (DMI) is an asymmetric exchange interaction[1,2] promoting chiral coupling between spins, giving rise to robust, chiral, topological spin textures, e.g., skyrmions with outstanding properties for information storage and processing[3]. DMI may originate, e.g., from the interface between a ferromagnet and a heavy metal. Recently it has been demonstrated that the DMI at such interfaces can be tuned by irradiation with keV He+ ions[4]. In a systematic study, we investigated the influence of local He+ ion irradiation on the magnetization dynamics in a perpendicularly magnetized ferromagnetic/heavy metal multilayer system by high-resolution magneto-optical Kerr-microscopy. [1] T. Moriya, Phys. Rev. Lett. 4, 228 (1960) [2] I. E. Dzyaloshinskii, J. Phys. Chem. Solids 4(4), 241-255 (1958) [3] C. Back et al, J. Phys. D: Appl. Phys. 53 363001 (2020) [4] H. T. Nembach, et al., Int. J. Appl. Phys. 131, 143901 (2022)