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이종에피에 의해 증착한 BiFeO<sub>3</sub> 박막의 전기 및 자기특성
이은구,Lee Eun Gu,Viehland D. 한국재료학회 2004 한국재료학회지 Vol.14 No.10
$BiFeO_3$ 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.