Wood, J.M., Oseghale, C.I. orcid.org/0000-0002-4404-7850, Cespedes, O. et al. (2 more authors) (2018) Control of ferromagnetic properties of Ni80Fe20 thin films by voltage-induced oxidation. Journal of Applied Physics, 124 (8). 085304. ISSN 0021-8979
Abstract
We demonstrate large voltage-induced changes of magnetic properties in thin films of Ni80Fe20(permalloy) when gated using an ionic liquid medium [1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMTFSI)]. The coercivity and magnetic moment of 5 nm thick permalloy films could be reduced by 75% and 35%, respectively, by using applied voltages. These changes were partially restored by reversing the potential polarity. Electrochemical, time-course magnetometry and surface analysis measurements suggest that the voltage-induced changes are due to changes in the oxidation state at the surface of the film, causing a thinning of the permalloy layer. The control of soft magnetic properties with low voltages may be of use in tuneable devices.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 The Authors. This is an author produced version of a paper subsequently published in Journal of Applied Physics. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Chemical and Biological Engineering (Sheffield) The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 21 Sep 2018 10:50 |
Last Modified: | 21 Sep 2018 10:50 |
Published Version: | https://doi.org/10.1063/1.5045552 |
Status: | Published |
Publisher: | AIP Publishing |
Refereed: | Yes |
Identification Number: | 10.1063/1.5045552 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:135854 |