Frequency dependence of the properties of a ferroelectric heterostructure

• Published in: Chinese journal of physics (Taipei) Vol. 77; pp. 134 - 142
• Main Authors: Cui, Lian, Che, Jixin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2022
• Subjects: Ferroelectric coupling; Ferroelectric heterostructure; Frequency; Surface transition layer; Ferroelectric coupling; Frequency; Surface transition layer; Ferroelectric heterostructure
• ISSN: 0577-9073
• DOI: 10.1016/j.cjph.2022.02.003

•Frequency dependence of properties of ferroelectric heterostructure is studied.•Contributions of ferroelectric coupling and surface transition layer are considered.•Higher frequency makes the hysteresis loop present severe lagging phenomenon.•Dielectric susceptibility embodies various peaks under different frequency.•Pyroelectric coefficient is intensively dependent on the frequency. Frequencyf-dependent characteristics have been systematically investigated in the ferroelectric heterostructure comprising two diverse ferroelectric films utilizing the Landau theory appended to Landau-Khalatnikov dynamic equation (LKDE). Two surface transition layers (STLs) in each film are assumed to be the same and a ferroelectric coupling between two component films is considered. The fdependence of hysteresis loop, coercive field, switching current, dielectric susceptibility and pyroelectric coefficient is systemically studied. We found that the dynamic properties of ferroelectric heterostructures are strongly frequency-dependent, and exhibit some abnormal behavior with the variation of frequency. The results are in good accordance with those observed in experiments. [Display omitted] The hysteresis loops of the ferroelectric heterostructure with various frequencies. The other parameters are set asl=6, tT=0.3, em=1.2,Δη=0.02,β=1.1, α=2, u=0.3, λ=0.3, ϕ=10