Nanoscale switching characteristics of nearly tetragonal BiFeO3 thin films

Dipanjan Mazumdar, Vilas Shelke, Milko Iliev, Stephen Jesse, Amit Kumar, Sergei V Kalinin, Arthur P Baddorf, Arunava Gupta

Research output: Contribution to journalArticlepeer-review

132 Citations (Scopus)

Abstract

We have investigated the nanoscale switching properties of strain-engineered BiFeO(3) thin films deposited on LaAlO(3) substrates using a combination of scanning probe techniques. Polarized Raman spectral analysis indicates 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.
Original languageEnglish
Pages (from-to)2555-61
Number of pages7
JournalNano Letters
Volume10
Issue number7
DOIs
Publication statusPublished - 2010

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