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http://dx.doi.org/10.3740/MRSK.2004.14.10.707

Electric and Magnetic Properties of Hetero-Epitaxially Deposited BiFeO3 Thin Films  

Lee Eun Gu (Dept. of Advanced Materials Science and Engineering, Chosun University)
Viehland D. (Dept. of Materials Science and Engineering, Virginia Tech)
Publication Information
Korean Journal of Materials Research / v.14, no.10, 2004 , pp. 707-712 More about this Journal
Abstract
$BiFeO_3$ 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 hetero-epitaxially grown $BiFeO_3$ thin films 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; thin film; heteroepitaxy;
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