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Multiferroic nanocrystalline BiFeO3 and BiCrO3 thin films prepared by ion beam sputtering

Couture, P., Williams, G.V.M., Kennedy, J., Leveneur, J., Murmu, P.P., Chong, S.V. and Rubanov, S. (2017) Multiferroic nanocrystalline BiFeO3 and BiCrO3 thin films prepared by ion beam sputtering International Journal of Nanotechnology, 14 (1-6). pp 56-65.

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Abstract

BiFeO3 and BiCrO3 films were made by room temperature sputtering followed by thermal annealing in a partial oxygen atmosphere. The annealed films were found to be nanocrystalline, with an average particle size of 11 nm for BiFeO3 and 8 nm for BiCrO3. The saturation moment per formula unit is 0.39 µB for BiFeO3 which is significantly greater than that found in bulk BiFeO3 (0.02 µB). A similar enhancement was also found in previous studies of BiFeO3 nanoparticles where the nanoparticle size was small. However, no large enhancement of the saturation moment per formula unit was identified for the annealed BiCrO3 films. The annealed BiFeO3 films displayed superparamagnetic behaviour and the particle size estimated from the blocking temperature is comparable to that estimated from the X-ray diffraction data. Our results show that sputtering and oxygen annealing is a method that can be used to make nanocrystalline BiFeO3 and BiCrO3 films.

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 : 23 February 2017
DOI : 10.1504/IJNT.2017.082445
Copyright Disclaimer : Copyright © 2017 Inderscience Enterprises Ltd.
Uncontrolled Keywords : Multiferroic; Ion beam sputtering; Nanocrystalline; Superparamagnetic; Magnetisation;BiFeO3
Additional Information : We acknowledge funding support from the New Zealand Ministry of Business, Innovation and Employment (C0X01206, C05X1404) and the MacDiarmid Institute for Advanced Materials and Nanotechnology.
Depositing User : Diane Maxfield
Date Deposited : 13 Nov 2019 15:25
Last Modified : 13 Nov 2019 15:25
URI: http://epubs.surrey.ac.uk/id/eprint/853125

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