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Long-range magnetic interactions and proximity effects in an amorphous exchange-spring magnet

Magnus, F; Brooks-Bartlett, ME; Moubah, R; Procter, RA; Andersson, G; Hase, TPA; Banks, ST; (2016) Long-range magnetic interactions and proximity effects in an amorphous exchange-spring magnet. Nature Communications , 7 , Article 11931. 10.1038/ncomms11931. Green open access

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Abstract

Low-dimensional magnetic heterostructures are a key element of spintronics, where magnetic interactions between different materials often define the functionality of devices. Although some interlayer exchange coupling mechanisms are by now well established, the possibility of direct exchange coupling via proximity-induced magnetization through non-magnetic layers is typically ignored due to the presumed short range of such proximity effects. Here we show that magnetic order can be induced throughout a 40-nm-thick amorphous paramagnetic layer through proximity to ferromagnets, mediating both exchange-spring magnet behaviour and exchange bias. Furthermore, Monte Carlo simulations show that nearest-neighbour magnetic interactions fall short in describing the observed effects and long-range magnetic interactions are needed to capture the extent of the induced magnetization. The results highlight the importance of considering the range of interactions in low-dimensional heterostructures and how magnetic proximity effects can be used to obtain new functionality.

Type: Article
Title: Long-range magnetic interactions and proximity effects in an amorphous exchange-spring magnet
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/ncomms11931
Publisher version: http://dx.doi.org/10.1038/ncomms11931
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Science & Technology, Multidisciplinary Sciences, Science & Technology - Other Topics, Classical Critical-Behavior, Monte-Carlo, Spin Models, Films, Temperatures, Layers, Order, Bias
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Engineering Science Faculty Office
URI: https://discovery.ucl.ac.uk/id/eprint/1511770
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