Improved magnetic and piezoresponse behavior of cobalt substituted BiFeO3 thin film
authors Coondoo, I; Panwar, N; Tomar, A; Bdikin, I; Kholkin, AL; Puli, VS; Katiyar, RS
nationality International
journal THIN SOLID FILMS
author keywords Piezoresponse; Bismuth iron oxide; Piezoelectric force microscopy
keywords FORCE MICROSCOPY; MULTIFERROICS; TEMPERATURE
abstract Piezoresponse force microscopy (PFM) technique has been utilized to characterize the nanoscale electromechanical properties of chemical solution deposited pristine (BiFeO3, BFO) and 5% Cobalt-substituted bismuth ferrite (BiFe0.95Co0.05O3, BFCO) thin films. Distinct PFM contrast was observed on the films' surface both in out-of-plane and in-plane modes. Piezoresponse signal was larger in BFCO film than BFO and the former film also exhibited negative self polarization. The calculated self polarization factor was -0.94. Lateral signal (in-plane) changed its sign upon 180 degrees sample rotation which ruled out spurious electrostatic contribution and confirmed piezoelectric nature of the effect. Square patterns were written by local poling and reversible nature of the piezoresponse behavior was established. Well saturated piezoelectric hysteresis loops were acquired with improved piezoelectric coefficient value in case of Co-substituted BFO film. The effect has been described on the basis of polarization rotation with doping. Magnetization of BFO film also increases with Co-substitution. The enhancement in magnetic and ferro/piezoelectric properties should be useful for multiferroic applications. (C) 2012 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0040-6090
year published 2012
volume 520
issue 21
beginning page 6493
ending page 6498
digital object identifier (doi) 10.1016/j.tsf.2012.06.079
web of science category Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter
subject category Materials Science; Physics
unique article identifier WOS:000307286100009
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