Interface conduction in BiFeO3-CoFe2O4 pillared nanostructures

• Main Authors: Jia-MingLiou, 劉家銘
• Other Authors: Yi-Chun Chen
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/93978914931463865968

碩士 === 國立成功大學 === 物理學系碩博士班 === 100 === The special feature of the interface between the oxide composite materials and conduction at the interface had attracted great interests in recent years. In this study, we investigated the conductivity mechanism in magneto-electric nano-composites composed of multiferroic BiFeO3 (BFO) and ferrite CoFe2O4 (CFO). By using conductive atomic force microscopy (c-AFM), the current distribution and the barrier for carrier transportation were analyzed. Meanwhile, the defect levels were observed by using photoluminescence spectrum. The results show that the BFO-CFO interface is more conductive than the matrices, and the conduction states are affected by external magnetic fields, irradiated laser light, and applied voltages. The conduction mechanism at the interface is thus discussed by measuring the variation of photoluminescence, which shows changes in defect levels, under different external parameters.