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Authors: Gruber, Raphael
Brems, Maarten A.
Rothörl, Jan
Sparmann, Tobias
Schmitt, Maurice
Kononenko, Iryna
Kammerbauer, Fabian
Syskaki, Maria-Andromachi
Farago, Oded
Virnau, Peter
Kläui, Mathias
Title: 300-times-increased diffusive skyrmion dynamics and effective pinning reduction by periodic field excitation
Online publication date: 16-May-2023
Year of first publication: 2023
Language: english
Abstract: Thermally induced skyrmion dynamics, as well as skyrmion pinning effects, in thin films have attracted significant interest. While pinning poses challenges in deterministic skyrmion devices and slows down skyrmion diffusion, for applications in non-conventional computing, both pinning of an appropriate strength and skyrmion diffusion speed are key. Here, periodic field excitations are employed to realize an increase of the skyrmion diffusion by more than two orders of magnitude. Amplifying the excitation, a drastic reduction of the effec tive skyrmion pinning, is reported, and a transition from pinning-dominated dif fusive hopping to dynamics approaching free diffusion is observed. By tailoring the field oscillation frequency and amplitude, a continuous tuning of the effec tive pinning and skyrmion dynamics is demonstrated, which is a key asset and enabler for non-conventional computing applications. It is found that the peri odic excitations additionally allow stabilization of skyrmions at different sizes for field values that are inaccessible in static systems, opening up new approaches to ultrafast skyrmion motion by transiently exciting moving skyrmions.
DDC: 530 Physik
530 Physics
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 08 Physik, Mathematik u. Informatik
Place: Mainz
Version: Published version
Publication type: Zeitschriftenaufsatz
License: CC BY-NC
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Journal: Advanced materials
Pages or article number: 2208922
Publisher: Wiley-VCH
Publisher place: Weinheim
Issue date: 2023
ISSN: 0935-9648
Publisher DOI: 10.1002/adma.202208922
Appears in collections:DFG-491381577-H

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