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Epitaxial BiFeO3 Multiferroic Thin Film Heterostructures
J. Wang,1J. B. Neaton,2H. Zheng,1V. Nagarajan,1S. B. Ogale,3B. Liu,1D. Viehland,4V. Vaithyanathan,5D. G. Schlom,5U. V. Waghmare,6N. A. Spaldin,7K. M. Rabe,2M. Wuttig,1R. Ramesh3*
Enhancement of polarization and related properties in
heteroepitaxially constrained thin films of the ferroelectromagnet,BiFeO3, is reported. Structure analysis indicates that the
crystalstructure of film is monoclinic in contrast to bulk, which isrhombohedral. The films display a room-temperature spontaneouspolarization (50 to 60 microcoulombs per square centimeter) almostan
order of magnitude higher than that of the bulk (6.1 microcoulombsper
square centimeter). The observed enhancement is corroboratedby
first-principles calculations and found to originate from ahigh
sensitivity of the polarization to small changes in latticeparameters.
The films also exhibit enhanced thickness-dependentmagnetism compared
with the bulk. These enhanced and combinedfunctional responses in thin
film form present an opportunityto create and implement thin film
devices that actively couplethe magnetic and ferroelectric order
parameters.
1 Department of Materials Science and Engineering,
University of Maryland, College Park, MD 20742, USA.
2 Department of Physics and Astronomy, Rutgers University,
Piscataway, NJ 08854, USA.
3 Department of Physics,
University of Maryland, College Park, MD 20742, USA.
4 Department of Materials Science and Engineering, Virginia
Polytechnic Institute, Blacksburg, VA 24061, USA.
5 Department of Materials Science and Engineering,
Pennsylvania State University, University Park, PA 16802-5055, USA.
6 J. Nehru Centre for Advanced Scientific Research, Jakkur,
Bangalore 560 064, India.
7 Materials Department, University
of California, Santa Barbara, CA 94805, USA.
*
To whom correspondence should be addressed. E-mail:
rr136{at}umail.umd.edu
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