Polarization Switching and Photoinduced Dielectric and Ferroelectric Properties in YMnO₃/La_0.67Sr_0.33MnO₃ Heterostructure

Abstract

YMnO/LaSrMnO heterostructure was fabricated on SrTiO (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' of o-YMnO (∼30 K), the T' of o-YMnO (∼40 K), and the T of h-YMnO (∼80 K). The variance tendency of the dielectric constant anomaly near the T' of o-YMnO progressively decreases as the frequency increases, while the anomaly near the T of h-YMnO is 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.

Optimized Magnetodielectric Coupling on High-Temperature Polymer-Based Nanocomposites

“…27 Since ME materials show an interesting interplay between the magnetic and electric properties of the matter, 28,29 those materials have drawn increasing interest due to their potential applications in areas such as information storage, spintronics, sensors, and actuators, among others. 24,30,31 ME materials can also reveal an important magnetodielectric (MD) coupling, 32 applied magnetic field, expanding the range of applications to tunable filters or four-state memories, among others. 17,33 In this work, composite films with 0−3 connectivity were prepared via in situ polymerization, using spherical cobalt ferrite nanoparticles (CoFe 2 O 4 ) as fillers and amorphous copolyimides, based on 3-bis(3-aminophenoxy)benzene (diamine 0CN) and 1,3-bis-2-cyano-3-(3-aminophenoxy)phenoxybenzene (diamine 2CN), as polymer matrix (Figure 1).…”

Review of photoinduced effect in manganite films and their heterostructures

“…[124] These results may be useful in developing potential applications of heterojunctions for optoelectronic detections. [125][126][127][128][129][130][131]…”

Dislocation Defect Layer-Induced Magnetic Bi-states Phenomenon in Epitaxial La0.7Sr0.3MnO3(111) Thin Films

“…Thus, they have been widely utilized in giant magnetoresistive (GMR) sensors, memories, and microwave applications . Researchers focus on how to regulate and control the nanostructures and magnetic properties of LSMO − ,− by growing superlattice or introducing nanostructure defects, in which a short-scale change may drive interesting physical phenomena.…”