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Nanocrystalline multiferroic BiFeO3 thin films made by room temperature sputtering and thermal annealing, and formation of an iron oxide-induced exchange bias

Couture, P., Williams, G.V.M., Kennedy, J., Leveneur, J., Murmu, P.P., Chong, S.V. and Rubanov, S. (2017) Nanocrystalline multiferroic BiFeO3 thin films made by room temperature sputtering and thermal annealing, and formation of an iron oxide-induced exchange bias Journal of Alloys and Compounds, 695. pp 3061-3068.

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Abstract

Multiferroic nanocrystalline BiFeO3films have been successfully made by room temperature sputtering and thermal annealing in oxygen at 500�C. Nanocrystalline Bi was seen before annealing as well asb-Bi2O3 and the iron oxide phases, magnetite, maghemite, and FeO. Superparamagnetism was observed that can be attributed to magnetite and maghemite nanoparticles. The thermally annealed film contained BiFeO3 nanoparticles and magnetite, maghemite, and hematite as well as unidentified BiFexOyphases. Superparamagnetism was also seen after annealing and the magnetic properties are predominately due to magnetite and maghemite nanoparticles rather than from multiferroic BiFeO3. The saturation magnetic moment was 60% lower after annealing, which was due to some of the Fe in the iron oxide nanoparticles being incorporated into the BiFeO3nanoparticles. An exchange bias was observed before and after annealing that cannot be attributed to a structure that includes BiFeO3. It is likely to arise from magnetite and maghemite cores with spin-disordered shells.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
Couture, P.p.couture@surrey.ac.uk
Williams, G.V.M.
Kennedy, J.
Leveneur, J.
Murmu, P.P.
Chong, S.V.
Rubanov, S.
Date : 25 February 2017
DOI : 10.1016/j.jallcom.2016.11.344
Copyright Disclaimer : ©2016 Elsevier B.V. All rights reserved
Uncontrolled Keywords : Multiferroic; BiFeO3; Ion beam sputtering; Nanoparticles; Exchange bias
Depositing User : Diane Maxfield
Date Deposited : 13 Nov 2019 16:14
Last Modified : 13 Nov 2019 16:14
URI: http://epubs.surrey.ac.uk/id/eprint/853126

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