Investigation local switching and self-organization effects on non-polar cuts of lithium niobate

The equipment of the Ural Center for Shared Use “Modern Nanotechnology” Ural Federal University was used. The research was made possible by Russian Science Foundation (Grant 14-12-00826)

Self-organized domain structure at non-polar cuts of lithium niobate as a result of local switching

The equipment of the Ural Center for Shared Use “Modern nanotechnology” Ural Federal University was used

Investigation of self-organization effects during local polarization switching on the surface of CLN

Было проведено исследование формирования квазирегулярных массивов иглообразных доменов на неполярных X и Y срезах ниобата лития при сканировании поверхности заземленным зондом сканирующего зондового микроскопа без приложения внешнего поля.In this work, we provide the results of experimental study of the formation of quasi-regular arrays of needle-like domains at the non-polar X and Y cuts of LN during scanning by grounded tip of scanning probe microscope in contact with the surface without application of external electric field.В работе использовалось оборудование Уральского центра коллективного пользования "Современные Нанотехнологии УрФУ". Работа выполнена при поддержке Российского Научного Фонда (грант 14-12-00826)

Piezoelectric Actuation of Graphene-Coated Polar Structures

Ferroelectric materials based on lead zirconate titanate (PZT) are widely used as sensors and actuators because of their strong piezoelectric activity. However, their application is limited because of the high processing temperature, brittleness, lack of conformal deposition, and a limited possibility to be integrated with the microelectromechanical systems (MEMS). Recent studies on the piezoelectricity in the 2-D materials have demonstrated their potential in these applications, essentially due to their flexibility and integrability with the MEMS. In this work, we deposited a few layer graphene (FLG) on the amorphous oxidized Si3N4 membranes and studied their piezoelectric response by sensitive laser interferometry and rigorous finite-element modeling (FEM) analysis. Modal analysis by FEM and comparison with the experimental results show that the driving force for the piezoelectric-like response can be a polar interface layer formed between the residual oxygen in Si3N4 and the FLG. The response was about 14 nm/V at resonance and could be further enhanced by adjusting the geometry of the device. These phenomena are fully consistent with the earlier piezoresponse force microscopy (PFM) observations of the piezoelectricity of the graphene on SiO2 and open up an avenue for using graphene-coated structures in the MEMS. © 1986-2012 IEEE.This work was supported in part by the Russian Foundation or Fundamental Research under Grant 16-29-14050, in part by the Ministry of Education and Science of the Russian Federation in the framework of the Increase Competitiveness Program of MISiS under Grant K2-2019-015, in part by the Project CICECO-Aveiro Institute of Materials financed by national funds through the Portuguese Foundation for Science and Technology/MCTES under Grants UIDB/50011/2020 and UIDP/50011/2020, and in part by the Center for Nanophase Materials Sciences, which is a Department of Energy Office of Science User Facility. The work was also supported by Government of the Russian Federation (Act 211, Agreement 02.A03.21.0006) and by the Ministry of Science and Higher Education of the Russian Federation (state task FEUZ-2020-0054). The equipment of the Ural Center for Shared Use “Modern nanotechnology” UrFU was used. The work of Yakov Kopelevich was supported in part by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and in part by the Fundação de Amparo à Pesquisa do Estado de S. Paulo (FAPESP) (Brazil)

THERMALLY ASSISTED GROWTH OF BULK DOMAINS CREATED BY FEMTOSECOND LASER IN MAGNESIUM DOPED LITHIUM NIOBATE

The domain growth to the polar surfaces from the tracks created by focused NIR femtosecond pulses in the bulk of MgO-doped lithium niobate plate has been studied. The tracks have been imaged by optical and Cherenkov-type second harmonic generation microscopy. The domain appearance at the irradiated

INFLUENCE OF FERROELECTRIC DOMAIN WALLS ON THE ANISOTROPY OF CHARGE INJECTION IN MgO:LiNbO3 MONOCRYSTALS

In this work, an experimental and theoretical study of the charge diffusion on the the non-polar surface of the single crystal of MgO:LiNbO3 in the presence of the domain walls formed by the scanning probe microscope.Исследование выполнено при поддержке Российского научного фонда (грант 23-72-01074) с использованием оборудования УЦКП «Современные нанотехнологии» УрФУ (рег.№ 2968)