Journal
MATERIALS RESEARCH EXPRESS
Volume 9, Issue 3, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/2053-1591/ac4328
Keywords
multiferroic heterostructure; thin film; sol-gel
Categories
Funding
- National Natural Science Foundation of China [61404033, 51762010]
- Guizhou Provincial High-level Innovative Talents [614040330]
- Cultivation Project of Guizhou University [13]
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Pure bismuth ferrite (BFO), zinc oxide (ZnO), and BFO/ZnO and ZnO/BFO composite thin films were successfully fabricated using a sol-gel process. The composite thin films showed broader absorption range, lower leakage current density, and improved ferroelectric and magnetic properties compared to the pure films.
Pure bismuth ferrite (BiFeO3, BFO) and ZnO thin films, as well as BFO/ZnO and ZnO/BFO composite thin films were successfully deposited by a sol-gel process on Pt/Ti/SiO2/Si and FTO/glass substrates, respectively. The chemical composition, surface morphology, optical properties, and multiferroicity were systematically investigated. X-ray diffraction and electron microscopy measurements were used to determine the crystalline phase and to analyze the surface morphology. Evidently, the absorption edges of both BFO/ZnO and ZnO/BFO films show a redshift, broadening the absorption range. The leakage current density decreases with the introduction of ZnO, and the ferroelectricity was significantly improved of the bilayers. Thereinto, BFO/ZnO and ZnO/BFO show the highest saturate polarization (2P (s)) of 46.7 mu c cm(-2) and the maximum remanent polarization (2P (r)) of 18.5 mu c cm(-2), respectively. Meanwhile, the magnetization measurement revealed that both BFO/ZnO and ZnO/BFO exhibiting an enhanced magnetization, especially, BFO/ZnO displays the highest saturation magnetization (2M (s), 68.87 emu cm(-3)) and remanent magnetization (2M (r), 4.87 emu cm(-3)).
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