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Title: Theory of isolated magnetic skyrmions: From fundamentals to room temperature applications

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.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1500030
Grant/Contract Number:  
SC0012371
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Büttner, Felix, Lemesh, Ivan, and Beach, Geoffrey S. D. Theory of isolated magnetic skyrmions: From fundamentals to room temperature applications. United States: N. p., 2018. Web. doi:10.1038/s41598-018-22242-8.
Büttner, Felix, Lemesh, Ivan, & Beach, Geoffrey S. D. Theory of isolated magnetic skyrmions: From fundamentals to room temperature applications. United States. doi:10.1038/s41598-018-22242-8.
Büttner, Felix, Lemesh, Ivan, and Beach, Geoffrey S. D. Tue . "Theory of isolated magnetic skyrmions: From fundamentals to room temperature applications". United States. doi:10.1038/s41598-018-22242-8. https://www.osti.gov/servlets/purl/1500030.
@article{osti_1500030,
title = {Theory of isolated magnetic skyrmions: From fundamentals to room temperature applications},
author = {Büttner, Felix and Lemesh, Ivan and Beach, Geoffrey S. D.},
abstractNote = {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.},
doi = {10.1038/s41598-018-22242-8},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {3}
}

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Works referenced in this record:

Spontaneous skyrmion ground states in magnetic metals
journal, August 2006

  • R��ler, U. K.; Bogdanov, A. N.; Pfleiderer, C.
  • Nature, Vol. 442, Issue 7104, p. 797-801
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Magnetic Domain-Wall Racetrack Memory
journal, April 2008