Nanoscale switching characteristics of nearly tetragonal BiFeO3 thin films

Details Nanoscale switching characteristics of nearly tetragonal BiFeO3 thin films Nanoscale switching characteristics of nearly tetragonal BiFeO3 thin films

2010-04-12

arxiv.org/abs/1004.2052v1

Physics

Condensed Matter

Materials Science

10 pages, 6 figures

Scientific paper

We have investigated the nanoscale switching properties of strain-engineered BiFeO3 thin films deposited on LaAlO3 substrates using a combination of scanning probe techniques. Polarized Raman spectral analysis indicate that the nearly-tetragonal films have monoclinic (Cc) rather than P4mm tetragonal symmetry. Through local switching-spectroscopy measurements and piezoresponse force microscopy we provide clear evidence of ferroelectric switching of the tetragonal phase but the polarization direction, and therefore its switching, deviates strongly from the expected (001) tetragonal axis. We also demonstrate a large and reversible, electrically-driven structural phase transition from the tetragonal to the rhombohedral polymorph in this material which is promising for a plethora of applications.

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