The role of temperature and drive current in skyrmion dynamics
| Autor: | Pedram Bassirian, Gisela Schütz, Markus Weigand, Geoffrey S. D. Beach, Robert M. Reeve, Kyujoon Lee, Niklas Keil, Ivan Lemesh, Jonathan Leliaert, Kai Litzius, Davi R. Rodrigues, Jeroen Mulkers, Karin Everschor-Sitte, Sascha Kromin, Jakub Zázvorka, Daniel Heinze, Nico Kerber, Bartel Van Waeyenberge, Mathias Kläui |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Condensed matter physics Spintronics Skyrmion High Energy Physics::Phenomenology Physik (inkl. Astronomie) Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Electronic Optical and Magnetic Materials Amplitude Ferromagnetism Thermal Electrical and Electronic Engineering Electric current Joule heating Instrumentation Nonlinear Sciences::Pattern Formation and Solitons Spin-½ |
| Zdroj: | Nature Electronics |
| ISSN: | 2520-1131 |
| Popis: | Magnetic skyrmions are topologically stabilized nanoscale spin structures that could be of use in the development of future spintronic devices. When a skyrmion is driven by an electric current it propagates at an angle relative to the flow of current-known as the skyrmion Hall angle (SkHA)-that is a function of the drive current. This drive dependence, as well as thermal effects due to Joule heating, could be used to tailor skyrmion trajectories, but are not well understood. Here we report a study of skyrmion dynamics as a function of temperature and drive amplitude. We find that the skyrmion velocity depends strongly on temperature, while the SkHA does not and instead evolves differently in the low- and high-drive regimes. In particular, the maximum skyrmion velocity in ferromagnetic devices is limited by a mechanism based on skyrmion surface tension and deformation (where the skyrmion transitions into a stripe). Our mechanism provides a complete description of the SkHA in ferromagnetic multilayers across the full range of drive strengths, illustrating that skyrmion trajectories can be engineered for device applications. An analysis of skyrmion dynamics at different temperatures and electric drive currents is used to develop a complete description of the skyrmion Hall angle in ferromagnetic multilayers from the creep to the flow regime and illustrates that skyrmion trajectories can be engineered for device applications. |
| Databáze: | OpenAIRE |
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