Authors: Hui Sun Baowen Zou Xiaoran Ni Xiangyu Mao Xiaobing Chen Jinsong Zhu
Publish Date: 2015/05/19
Volume: 50, Issue: 16, Pages: 5475-5481
Abstract
The Fecontaining Aurivillius phase Bi6Fe2Ti3O18 BFFT thin films were successfully prepared using the chemical solution deposition technique The microstructure ferroelectricity and magnetic properties were investigated A defined hysteresis loop was obtained with the remnant polarization 2P r 226 μC/cm2 at 2 kHz under the electric field ~600 kV/cm The frequency dependence of hysteresis loops was also studied to exclude contribution of the leakage current to polarization in BFFT thin film Furthermore the electromechanical responses of the films were investigated using piezoresponse force microscopy These results indicate the intrinsic ferroelectricity in the present BFFT films It was found that the BFFT film shows roomtemperature weak ferromagnetism with the saturated magnetization M s ~29 emu/cm3 To explore the origin of the observed weak ferromagnetism the magnetism of the same stoichiometric ceramics and the films was compared The BFFT ceramics show antiferromagnetic interaction background while the magnetism of the BFFT film may originate from the spin canting of the coupling of the Fe3+based and Fe2+based sublattices The existence of Fe2+ ions in the BFFT films was also proved by the XPS spectrum
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