Thermal stability of metastable magnetic skyrmions / Louise Desplat.
2021
QC793.3.S8 D47 2021eb
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Title
Thermal stability of metastable magnetic skyrmions / Louise Desplat.
Author
Desplat, Louise.
ISBN
9783030660260 (electronic bk.)
3030660265 (electronic bk.)
3030660257
9783030660253
3030660265 (electronic bk.)
3030660257
9783030660253
Published
Cham : Springer, 2021.
Copyright
©2021
Language
English
Description
1 online resource (xix, 152 pages)
Item Number
10.1007/978-3-030-66026-0 doi
Call Number
QC793.3.S8 D47 2021eb
Dewey Decimal Classification
539.7/4
Summary
The energy cost associated with modern information technologies has been increasing exponentially over time, stimulating the search for alternative information storage and processing devices. Magnetic skyrmions are solitonic nanometer-scale quasiparticles whose unique topological properties can be thought of as that of a Mobius strip. Skyrmions are envisioned as information carriers in novel information processing and storage devices with low power consumption and high information density. As such, they could contribute to solving the energy challenge. In order to be used in applications, isolated skyrmions must be thermally stable at the scale of years. In this work, their stability is studied through two main approaches: the Kramers' method in the form of Langer's theory, and the forward flux sampling method. Good agreement is found between the two methods. We find that small skyrmions possess low internal energy barriers, but are stabilized by a large activation entropy. This is a direct consequence of the existence of stable modes of deformation of the skyrmion. Additionally, frustrated exchange that arise at some transition metal interfaces leads to new collapse paths in the form of the partial nucleation of the corresponding antiparticle, as merons and antimerons.
Note
"Doctoral Thesis accepted byUniversity of Glasgow, Glasgow, United Kingdom."
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Includes bibliographical references.
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Online resource; title from PDF title page (SpringerLink, viewed March 18, 2021).
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Springer theses.
Available in Other Form
Thermal stability of metastable magnetic skyrmions.
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Table of Contents
Introduction
Topological Solitons in Magnetic Systems
Langer's Theory and Application to Magnetic Spin Systems
Thermal Stability of Chiral Magnetic Skyrmions from Langer's Theory
Skyrmion Collapse Rate Computation via Forward Flux Sampling and Comparison with Langer's Theory
Paths to Annihilation of First- and Second-Order (Anti)skyrmions Under Frustrated Exchange
Conclusion and outlook.
Topological Solitons in Magnetic Systems
Langer's Theory and Application to Magnetic Spin Systems
Thermal Stability of Chiral Magnetic Skyrmions from Langer's Theory
Skyrmion Collapse Rate Computation via Forward Flux Sampling and Comparison with Langer's Theory
Paths to Annihilation of First- and Second-Order (Anti)skyrmions Under Frustrated Exchange
Conclusion and outlook.