Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Ferroelectric and Magnetic Properties of BiFeO3 Thin Films Deposited on SrTiO3 Substrate

SrTiO3기판 위에 증착한 BiFeO3박막의 강유전 및 자기적 특성

  • 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)
  • Published : 2008.06.30
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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

References

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