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標題: Multiferroic Properties and Leakage Current Mechanisms of Bi0.9Eu0.1FeO3 Thin Films
作者: Kao, M.C.
Chen, H.Z.
Young, S.L.
Chiang, J.L.
Lin, C.C.
Kung, C.Y.
Lin, C.H.
Liao, C.C.
關鍵字: Bismuth ferrite;leakage current;magnetic;multiferroic;magnetic-properties
Project: Ieee Transactions on Magnetics
期刊/報告no:: Ieee Transactions on Magnetics, Volume 47, Issue 10, Page(s) 2784-2787.
Bi0.9Eu0.1FeO3 (BEFO) thin films were deposited on Pt(111)/Ti/SiO2/Si(100) substrates using the sol-gel method and rapid thermal annealing in an oxygen atmosphere. The effects of annealing temperature (400 similar to 700 degrees C) on microstructure and multiferroic properties of thin films were investigated. The X-ray diffraction analysis showed that the BEFO thin films had an orthorhombic structure. The thin films showed ferroelectric and ferromagnetic properties with remanent polarization (2P(r)) of 15 mu C/cm(2) and remnant magnetization (2Mr) of 4.2 emu/g. The leakage current density (J) of the BEFO thin film annealed at 700 degrees C was 4.25 x 10(-8) A/cm(2) at 150 kV/cm. The leakage current was affected not only by the microstructure but also by the interface between the Pt electrode and the BEFO thin films. Moreover, it was found that more than one conduction mechanism was involved in the electric field range used in these experiments. In the low electric field region, the leakage current was controlled by Poole-Frenkel emission. However, the mechanism could be explained by Schottky emission from the Pt electrode in the high electric field region.
ISSN: 0018-9464
DOI: 10.1109/tmag.2011.2156764
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