Ultra-high resistive switching current ratio and improved ferroelectricity and dielectric tunability performance in a BaTiO3/La0.7Sr0.3MnO3 heterostructure by inserting a SrCoO2.5 layer

Xi Zhang; Xin Chen; J. P. Cao; H. W. Wang; W. Y. Deng; L. H. Yang; K. Lin; Q. Li; Q. H. Li; Y. L. Cao; J. X. Deng; Jun Miao

doi:10.1039/D3NR04591A

Ultra-high resistive switching current ratio and improved ferroelectricity and dielectric tunability performance in a BaTiO₃/La_0.7Sr_0.3MnO₃ heterostructure by inserting a SrCoO_2.5 layer†

Xi Zhang,‡^ab Xin Chen,

‡*^b J. P. Cao,^ab H. W. Wang,^ab W. Y. Deng,^ab L. H. Yang,^c K. Lin,^b Q. Li,

^b Q. H. Li,^b Y. L. Cao,^b J. X. Deng^b and Jun Miao

*^ab

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* Corresponding authors

^a School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
E-mail: J.miao@ustb.edu.cn

^b Institute of Solid State Chemistry, University of Science and Technology Beijing, Beijing 100083, China
E-mail: chenx@ustb.edu.cn

^c Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Abstract

A BaTiO₃/SrCoO_2.5 (BTO/SCO) bilayer and a BTO single film were prepared by radio frequency magnetron sputtering on La_0.7Sr_0.3MnO₃ (LSMO) buffered SrTiO₃ (001) substrates. Interestingly, compared with reported BTO-based films, the BTO/SCO/LSMO heterostructure has a maximum ON/OFF current ratio of ∼945. More interestingly, compared with the BTO single layer, a larger P_r (∼18.4 μC cm⁻²) and larger dielectric tunability (∼71.9%) were achieved in the BTO/SCO bilayer. The improved performance may be attributed to the large tetragonality and improved oxygen vacancy concentrations in the BTO/SCO/LSMO heterostructure. Furthermore, our BTO/SCO/LSMO stacks exhibit potential for flexible electronic informational devices.

Nanoscale

Ultra-high resistive switching current ratio and improved ferroelectricity and dielectric tunability performance in a BaTiO₃/La_0.7Sr_0.3MnO₃ heterostructure by inserting a SrCoO_2.5 layer†

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Ultra-high resistive switching current ratio and improved ferroelectricity and dielectric tunability performance in a BaTiO₃/La_0.7Sr_0.3MnO₃ heterostructure by inserting a SrCoO_2.5 layer

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