Theory of isolated magnetic skyrmions: From fundamentals to room temperature applications
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s41598-018-22242-8.pdf
Size
2.21 MB
Format
Adobe PDF
Checksum (MD5)
6e9d1a818d7fecd6ace63f40e4a7febb
Author(s)
Buettner, Felix
Lemesh, Ivan
Beach, Geoffrey Stephen
Date Issued
March 2018
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Büttner, Felix et al. “Theory of Isolated Magnetic Skyrmions: From Fundamentals to Room Temperature Applications.” Scientific Reports 8, 1 (March 2018) © 2018 The Author(s)
Version
Final published version
Abstract
Magnetic skyrmions are topological quasiparticles of great interest for data storage applications because of their small size, high stability, and ease of manipulation via electric current. However, although models exist for some limiting cases, there is no universal theory capable of accurately describing the structure and energetics of all skyrmions. The main barrier is the complexity of non-local stray field interactions, which are usually included through crude approximations. Here we present an accurate analytical framework to treat isolated skyrmions in any material, assuming only a circularly-symmetric 360° domain wall profile and a homogeneous magnetization profile in the out-of-plane direction. We establish the first rigorous criteria to distinguish stray field from DMI skyrmions, resolving a major dispute in the community. We discover new phases, such as bi-stability, a phenomenon unknown in magnetism so far. We predict materials for sub-10 nm zero field room temperature stable skyrmions suitable for applications. Finally, we derive analytical equations to describe current-driven dynamics, find a topological damping, and show how to engineer materials in which compact skyrmions can be driven at velocities > 1000 m/s.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Attribution 4.0 International (CC BY 4.0)
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/s41598-018-22242-8
