Thermal skyrmion diffusion used in a reshuffler device
| Autor: | Daniel Heinze, Karin Everschor-Sitte, Levente Rózsa, Ulrich Nowak, Mathias Kläui, Sascha Kromin, Samridh Jaiswal, Florian Jakobs, Gerhard Jakob, Daniele Pinna, Peter Virnau, Jakub Zázvorka, Andreas Donges, Niklas Keil, Kai Litzius |
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| Rok vydání: | 2019 |
| Předmět: |
Work (thermodynamics)
530 Physics Biomedical Engineering Bioengineering 02 engineering and technology 010402 general chemistry Thermal diffusivity 01 natural sciences Thermal ddc:530 General Materials Science Electrical and Electronic Engineering Diffusion (business) Physics Condensed matter physics Texture (cosmology) Skyrmion Energy landscape Physik (inkl. Astronomie) 530 Physik Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics 0104 chemical sciences 0210 nano-technology Unconventional computing |
| Zdroj: | Nature Nanotechnology. 14:658-661 |
| ISSN: | 1748-3395 1748-3387 |
| Popis: | Magnetic skyrmions in thin films can be efficiently displaced with high speed by using spin-transfer torques1,2 and spin–orbit torques3–5 at low current densities. Although this favourable combination of properties has raised expectations for using skyrmions in devices6,7, only a few publications have studied the thermal effects on the skyrmion dynamics8–10. However, thermally induced skyrmion dynamics can be used for applications11 such as unconventional computing approaches12, as they have been predicted to be useful for probabilistic computing devices13. In our work, we uncover thermal diffusive skyrmion dynamics by a combined experimental and numerical study. We probed the dynamics of magnetic skyrmions in a specially tailored low-pinning multilayer material. The observed thermally excited skyrmion motion dominates the dynamics. Analysing the diffusion as a function of temperature, we found an exponential dependence, which we confirmed by means of numerical simulations. The diffusion of skyrmions was further used in a signal reshuffling device as part of a skyrmion-based probabilistic computing architecture. Owing to its inherent two-dimensional texture, the observation of a diffusive motion of skyrmions in thin-film systems may also yield insights in soft-matter-like characteristics (for example, studies of fluctuation theorems, thermally induced roughening and so on), which thus makes it highly desirable to realize and study thermal effects in experimentally accessible skyrmion systems. Thermal diffusion of skyrmions in a non-flat energy landscape shows exponential temperature dependence and can be used for a reshuffler device with potential application in probabilistic computing. |
| Databáze: | OpenAIRE |
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