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Work by Prof. Katiyar and his collaborators, was selected as cover page of Materials Research Bulletin

03/13/ 2014

Neeraj Panwar, Indrani Coondoo, , Amit Tomar, A.L. Kholkin, Venkata S. Puli, Ram S. Katiyar. Nanoscale piezoresponse and magnetic studies of multiferroic Co and Pr co-substituted BFO thin films. Materials Research Bulletin. 47, 4240–4245 (2012).


Piezoresponse Force Microscopy (PFM) technique has been employed to acquire out-of-plane (OPP) piezoresponse images and local piezoelectric hysteresis loop in rhombohedrally distorted Bi1?xPrxFe1?yCoyO3 [x = 0, 0.05; y = 0.05] polycrystalline thin films fabricated via chemical solution deposition method. PFM images revealed that piezoelectric contrast is dependent upon the film composition. Furthermore, negative self-polarization effect was observed in the cobalt substituted BFO film. Well saturated local piezo-hysteresis loops were monitored and an increase was noticed in the piezoelectric coefficient (d33) value with cobalt doping (25.1 pm/V) whereas with Pr co-substitution in BFCO film, the piezoelectric behavior was almost suppressed. Pr and cobalt co-substituted film exhibited the lowest leakage current density. Magnetic behavior (MH curves) exhibited nearly eight times enhancement in the saturation magnetization values in the Co- and Co–Pr substituted films. The present study provides the different elements’ substitution effect on the local piezoelectric and magnetic properties of BiFeO3 multiferroic thin film.

http://www.sciencedirect.com/science/article/pii/S0025540812007040