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http://dx.doi.org/10.4191/KCERS.2008.45.6.358

Ferroelectric and Magnetic Properties of BiFeO3 Thin Films Deposited on SrTiO3 Substrate  

Lee, Eun-Gu (Department of Advanced Materials Engineering, Chosun University)
Kim, Sun-Jae (Department of Advanced Institute of Nano Technologies, Sejong University)
Lee, Jae-Gab (School of Advanced Materials Engineering, Kookmin University)
Publication Information
Journal of the Korean Ceramic Society / v.45, no.6, 2008 , pp. 358-362 More about this Journal
Abstract
$BiFeO_3$ films were hetero-epitaxially grown on $SrTiO_3$ substrate with a various orientation by pulse laser deposition. $BiFeO_3$ films grown on (111) $SrTiO_3$ substrate have a rhombohedral structure, identical to that of single crystals. On the other hand, films grown on (110) or (001) $SrTiO_3$ substrate are monoclinically distorted from the rhombohedral structure due to the epitaxial constraint. The easy axis of spontaneous polarization is close to [111] for the variously oriented films. Dramatically enhanced polarization and magnetization have been found for $BiFeO_3$ thin films grown on $SrTiO_3$ substrate comparing to that of $BiFeO_3$ crystals. The results are explained in terms of an epitaxially-induced transition between cycloidal and homogeneous spin states, via magneto-electric interactions.
Keywords
Ferroelectric; Ferromagnetic; Magnetoelectric effects;
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