Resistive Switching Effect and Dielectric Property of Epitaxial BiFeO3 Thin Films by Off-axis Magnetron Sputtering

doi:10.15541/jim20170603

Abstract

Abstract:

The Pt/BiFeO₃/La_0.5Sr_0.5CoO₃/SrTiO₃(Pt/BFO/LSCO/STO) heterostructures were fabricated on (001) SrTiO₃ substrate by off-axis RF magnetron sputtering, on which epitaxial BiFeO₃(BFO) thin films were suecessfully grown. The BFO thin film shows good crystal quality with (00l) epitaxial growth as confirmed by the atomic force microscope (AFM) and X-ray diffraction (XRD). Pt/BFO/LSCO capacitor exhibits a saturated butterfly loop with tuning rate of 14.1% and dielectric loss of 0.19 at 5 V driving voltage. Moreover, the resistance changes from high value to low value with positive voltage 0→5→0 V and negative voltage 0→-5→0 V, which displays switch behavior of ferroelectric diode resistance-change. Based on the I-V fitting curves, the resistance change mechanism fits the space charge limited current trap level when 0→5→0→-5 V and the interface limit F-N tunneling mechanism as -5→0 V, respectively.

Key words: BiFeO₃ thin films, dielectric constant, resistive effect, conduction mechanism

CLC Number:

O484

SONG Jian-Min, DAI Xiu-Hong, LIANG Jie-Tong, ZHAO Lei, ZHOU Yang, GE Da-Yong, MENG Xu-Dong, LIU Bao-Ting. Resistive Switching Effect and Dielectric Property of Epitaxial BiFeO₃ Thin Films by Off-axis Magnetron Sputtering[J]. Journal of Inorganic Materials, 2018, 33(9): 1017-1021.

Figures/Tables 5

Fig. 1 (a) AFM image of BFO thin film and (b) XRD pattern of BFO/LSCO/STO heterostructures

Fig. 2 (a) Frequency dependence of dielectric constant and dielectric loss of BFO thin film in Pt/BFO/LSCO heterostructures, and (b) voltage dependence of dielectric constant and dielectric loss of BFO thin film in Pt/BFO/LSCO heterostructures

Fig. 3 I-V curves of Pt/BFO/LSCO heterostructures(a) Linear coordinate; (b) Logarithmic coordinate

Fig. 4 lgI-lgV fitting curves of Pt/BFO/LSCO heterostructures

Fig. 5 ln(J/V2)-V-1 fitting curve of Pt/BFO/LSCO heterostructures at -5 V→0 V

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Resistive Switching Effect and Dielectric Property of Epitaxial BiFeO₃ Thin Films by Off-axis Magnetron Sputtering

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