SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 43: Magnetic Imaging Techniques II
MA 43.4: Vortrag
Donnerstag, 30. März 2023, 15:45–16:00, HSZ 401
Direct imaging of nanoscale field-driven domain wall oscillations in Landau structures — •Balram Singh1, Rachappa Ravishankar1, Jorge A. Otálora2, Ivan Soldatov1, Rudolf Schäfer1, Daniil Karnaushenko3, Volker Neu1, and Oliver G. Schmidt3 — 1Institute for Integrative Nanosciences, Leibniz IFW Dresden, 01069 Dresden, Germany — 2Departamento de Física, Universidad Católica del Norte, Avenida Angamos 0610, Casilla 1280, Antofagasta, Chile — 3Center for Materials, Architectures and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, 09126 Chemnitz, Germany.
Linear oscillatory motion of domain walls (DWs) in the kHz and MHz regime is crucial when realizing precise magnetic field sensors such as giant magnetoimpedance devices. Here, we report an imaging approach to investigate such DW dynamics with nanoscale spatial resolution employing conventional table-top microscopy techniques. Time-averaged magnetic force microscopy and Kerr imaging methods are applied to quantify the DW oscillations in Permalloy rectangular structures with Landau domain configuration and are complemented by numeric micromagnetic simulations. We study the oscillation amplitude as a function of external magnetic field strength, frequency, magnetic structure size, thickness, and anisotropy and understand the excited DW behavior as a forced damped harmonic oscillator with restoring force being influenced by the geometry, thickness, and anisotropy of the Permalloy structure.