Ferroelectric and electrical characterization of multiferroic BiFeO 3 at the single nanoparticle level

R. K. Vasudevan, K. A. Bogle, A. Kumar, S. Jesse, R. Magaraggia, R. Stamps, S. B. Ogale, H. S. Potdar, V. Nagarajan

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Abstract

Ferroelectric BiFeO 3 (BFO) nanoparticles deposited on epitaxial substrates of SrRuO 3 (SRO) and La 1-xSr xMnO 3 (LSMO) were studied using band excitation piezoresponse spectroscopy (BEPS), piezoresponse force microscopy (PFM), and ferromagnetic resonance (FMR). BEPS confirms that the nanoparticles are ferroelectric in nature. Switching behavior of nanoparticle clusters were studied and showed evidence for inhomogeneous switching. The dimensionality of domains within nanoparticles was found to be fractal in nature, with a dimensionality constant of ∼1.4, on par with ferroelectric BFO thin-films under 100 nm in thickness. Ferromagnetic resonance studies indicate BFO nanoparticles only weakly affect the magnetic response of LSMO.

Original languageEnglish
Article number252905
JournalApplied Physics Letters
Volume99
Issue number25
DOIs
StatePublished - Dec 19 2011

Funding

We acknowledge the contributions of S. V. Kalinin for facilities access and valuable advice. We also acknowledge support of Australia-India Strategic Research Fund ST20078. R.K.V. and V.N. acknowledge access to the UNSW node of the Australian Microscopy & Microanalysis Research Facility (AMMRF) and ARC Discovery Project DP1096669. The research at ORNL (A.K. and S.J.) was conducted at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Basic Energy Sciences, U.S. Department of Energy.

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