Hello everyone,
I want to know during PLD, where from bound charges come at the surface of ferroelectric materials? I want to know their origin, their charge either positive or negative, and their screening process (i.e. how to screen) and their effect on polarization of material. Moreover I also want to know what is depolarizing filed and what is its origin and how it could effect ferroelectric materials? A good ferroelectric material should have high depolarization field or low and why?
The last thing I want to know that these bound charges/depolarization field could exist only in PLD film preparation or also can be in hydrothermal/solgel film synthesis ?
Kindly anyone who is expert explain it.
Thank you
Hello,
First of all, the bound charges are inherently generated by the ferroelectrics, by its definition, so I guess what you ask is the origin of screening charges. Screening charges comes from band bending, surface reconstruction, and absorption, etc, their characteristic dynamics are diverse.
If the bound charges are not fully screened, then comes the depolarisation field. Usually this leads to domain reconfiguration. The ferroelectrics will reduce its depolarisation field to reach minimum energy. So it should be not large if the system is stable, but it is not a criteria of whether it is good or bad.
Screening process do exist in all the preparation techniques.
Please refer this review for details.
Kalinin, Sergei V, Yunseok Kim, Dillon D Fong, and Anna N Morozovska. “Surface-Screening Mechanisms in Ferroelectric Thin Films and Their Effect on Polarization Dynamics and Domain Structures.” Reports on Progress in Physics 81, no. 3 (March 1, 2018): 036502. https://doi.org/10.1088/1361-6633/aa915a.
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