Observation of thermally-induced magnetic relaxation in a magnetite grain using off-axis electron holography

Almeida, T. P. , Muxworthy, A. R., Kovács, A., Williams, W. and Dunin-Borkowski, R. E. (2017) Observation of thermally-induced magnetic relaxation in a magnetite grain using off-axis electron holography. Journal of Physics: Conference Series, 902, 012001. (doi:10.1088/1742-6596/902/1/012001)

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Abstract

A synthetic basalt comprising magnetic Fe3O4 grains (~ 50 nm to ~ 500 nm in diameter) is investigated using a range of complementary nano-characterisation techniques. Off-axis electron holography combined with in situ heating allowed for the visualisation of the thermally-induced magnetic relaxation of an Fe3O4 grain (~ 300 nm) from an irregular domain state into a vortex state at 550˚C, just below its Curie temperature, with the magnetic intensity of the vortex increasing on cooling.

Item Type:Articles
Additional Information:The authors would like to thank NERC (grant NE/J020966/1) and ERC (grant 320832) for funding.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Almeida, Dr Trevor
Authors: Almeida, T. P., Muxworthy, A. R., Kovács, A., Williams, W., and Dunin-Borkowski, R. E.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Physics: Conference Series
Publisher:IOP Publishing
ISSN:1742-6588
ISSN (Online):1742-6596
Published Online:16 October 2017
Copyright Holders:Copyright © 2017 IOP Publishing Ltd
First Published:First published in Journal of Physics: Conference Series 902: 012001
Publisher Policy:Reproduced under a Creative Commons License

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