title: Polarization Switching and Photoinduced Dielectric and Ferroelectric Properties in YMnO3/La0.67Sr0.33MnO3Heterostructure.
abstract: YMnO3/La0.67Sr0.33MnO3heterostructure was fabricated on SrTiO3(110) substrate by pulse laser deposition technology. The photoinduced resistance is markedly decreased in the low temperature region (20-300 K), especially arresting at the T'Cof o-YMnO3(∼30 K), the T'Nof o-YMnO3(∼40 K), and the TNof h-YMnO3(∼80 K). The variance tendency of the dielectric constant anomaly near the T'Nof o-YMnO3progressively decreases as the frequency increases, while the anomaly near the TNof h-YMnO3is not observed in the same frequency region. Additionally, the dielectric constant is suppressed under photo excitation, and the variation increases with the rise in temperature and frequency. A distinct photoinduced suppression in the ferroelectric hysteresis loops is observed, maybe the trapping of photoinduced electrons to incur the reorientation of domain or increase the leakage current density. The obvious polarization switching in phase and amplitude images are observed when poling at ±8 V DC bias by the piezoresponse force microscopy technique at room temperature.
authors.affiliation: Shaanxi Key Laboratory of Condensed Matter Structures and Properties, Northwestern Polytechnical University , Xi'an 710072, China.|College of Engineering management, Shaanxi Radio and Television University , Xi'an 710019, China.
authors.forename: Yanan
authors.identifier: http://orcid.org/0000-0001-9200-4970
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Shaanxi Key Laboratory of Condensed Matter Structures and Properties, Northwestern Polytechnical University , Xi'an 710072, China.
authors.forename: Bingcheng
authors.identifier: http://orcid.org/0000-0001-8615-3849
authors.initials: B
authors.lastname: Luo
authors.affiliation: Shaanxi Key Laboratory of Condensed Matter Structures and Properties, Northwestern Polytechnical University , Xi'an 710072, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Xing
authors.affiliation: Shaanxi Key Laboratory of Condensed Matter Structures and Properties, Northwestern Polytechnical University , Xi'an 710072, China.
authors.forename: Changle
authors.initials: C
authors.lastname: Chen
authors.affiliation: Shaanxi Key Laboratory of Condensed Matter Structures and Properties, Northwestern Polytechnical University , Xi'an 710072, China.
authors.forename: Jianyuan
authors.initials: J
authors.lastname: Wang
authors.affiliation: Shaanxi Key Laboratory of Condensed Matter Structures and Properties, Northwestern Polytechnical University , Xi'an 710072, China.
authors.forename: Kexin
authors.initials: K
authors.lastname: Jin
keywords: PFM; YMnO3/La0.67Sr0.33MnO3; photoinduced dielectric; photoinduced ferroelectric; photoinduced resistance