Hayward, T.J. and Omari, K.A. (2017) Beyond the quasi-particle: Stochastic domain wall dynamics in soft ferromagnetic nanowires. Journal of Physics D: Applied Physics, 50 (8). 084006. ISSN 0022-3727
Abstract
We study the physical origins of stochastic domain wall pinning in soft ferromagnetic nanowires using focused magneto-optic Kerr effect measurements and dynamic micromagnetic simulations. Our results illustrate the ubiquitous nature of these effects in Ni80Fe20 nanowires, and show that they are not only a result of the magnetisation history of the system (i.e. the magnetisation structure of the injected domain walls), and the onset of non-linear propagation dynamics above the Walker breakdown field, but also a complex interplay between the two. We show that this means that, while micromagnetics can be used to make qualitative predictions of the behaviour of domain walls at defect sites, making quantitative predictions is much more challenging. Together, our results reinforce the view that even in these simple pseudo-one dimensional nanomagnets, domain walls must be considered as complex, dynamically evolving objects rather than simple quasi-particles.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence . Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
Keywords: | Domain wall; stochastic; nanomagnets; racetrack memory; domain wall logic |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/J002275/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 08 Mar 2017 14:31 |
Last Modified: | 08 Mar 2017 14:31 |
Published Version: | https://doi.org/10.1088/1361-6463/aa553f |
Status: | Published |
Publisher: | IOP Publishing |
Refereed: | Yes |
Identification Number: | 10.1088/1361-6463/aa553f |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:112825 |
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