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300-Times-Increased Diffusive Skyrmion Dynamics and Effective Pinning Reduction by Periodic Field Excitation
Raphael Gruber1, Maarten A Brems1, Jan Rothörl1
1Johannes Gutenberg-Universität Mainz, Institut für Physik, Staudingerweg 7, 55128, Mainz, Germany.
Advanced Materials (Deerfield Beach, Fla.)
|February 4, 2023
Summary
Researchers enhanced skyrmion diffusion speed by over two orders of magnitude using periodic field excitations. This method reduces skyrmion pinning, enabling tunable dynamics crucial for non-conventional computing applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Skyrmion dynamics and pinning in thin films are critical for device applications.
- Pinning impedes deterministic skyrmion devices but is essential for non-conventional computing.
- Controlling skyrmion diffusion speed and pinning strength is key for advanced applications.
Purpose of the Study:
- To investigate the effect of periodic field excitations on skyrmion dynamics and pinning.
- To demonstrate a method for significantly increasing skyrmion diffusion speed.
- To enable tunable skyrmion pinning for non-conventional computing.
Main Methods:
- Applying periodic magnetic field excitations to thin-film magnetic systems.
- Systematically varying field oscillation frequency and amplitude.
- Observing and quantifying changes in skyrmion diffusion and pinning behavior.
Main Results:
- Skyrmion diffusion increased by over two orders of magnitude.
- Effective skyrmion pinning was drastically reduced with amplified excitations.
- A transition from pinning-dominated hopping to free diffusion dynamics was observed.
- Continuous tuning of effective pinning and dynamics achieved by tailoring field parameters.
- Stabilization of skyrmions at different sizes in previously inaccessible field regimes.
Conclusions:
- Periodic field excitations offer a powerful tool to control skyrmion dynamics.
- This control is essential for realizing advanced non-conventional computing applications.
- The method allows for ultrafast skyrmion motion and novel skyrmion stabilization techniques.
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