| SrTiO3기판 위에 증착한 BiFeO3박막의 강유전 및 자기적 특성 |
| 이은구, 김선재1, 이재갑2 |
조선대학교 신소재공학과
1세종대학교 나노공학과
2국민대학교 신소재공학부 |
| Ferroelectric and Magnetic Properties of BiFeO3 Thin Films Deposited on SrTiO3 Substrate |
| Eun-Gu Lee, Sun-Jae Kim1, Jae-Gab Lee2 |
Department of Advanced Materials Engineering, Chosun University
1Department of Advanced Institute of Nano Technologies, Sejong University
2School of Advanced Materials Engineering, Kookmin University |
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| ABSTRACT |
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$BiFeO_3$ 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. |
| Key words:
Ferroelectric, Ferromagnetic, Magnetoelectric effects |
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