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- W4228997629 abstract "The ambient and ultra-high vacuum scanning probe microscopy was employed for the investigation of ferroelectric properties of cleaved 2D flakes of copper indium thiophosphate, CuInP 2 S 6 (CIPS). At ambient temperature and above, CIPS is the only material family known to exhibit ferroelectric polarization in a van der Waals layered crystal. Performed measurements reveal stable ferroelectric polarization which is evidenced by domain structures, switchable polarization, and hysteresis loops. At room temperature, the domain structure of flakes thicker than 100 nm is like that of cleaved bulk surfaces, whereas polarization disappears below 50 nm. This behavior is explained by a well-known polarization instability caused by a depolarization field. Additionally, polarization switching at high bias is linked to ionic mobility, as indicated by macroscopic measurements and the creation of surface damage under the tip at a bias of 4 V – likely due to copper reduction. As a result, mobile Cu ions may play a role in internal screening mechanisms. Therefore, mobile Cu ions may also contribute to internal screening mechanisms. The presence of stable polarization in a van der Waals crystal suggests novel possibilities for ultimate scaling of polar materials, quasi-2D and single-layer materials with advanced and non-linear dielectric properties not currently found in any members of the developing “ graphene family. ”" @default.
- W4228997629 created "2022-05-08" @default.
- W4228997629 creator A5062837469 @default.
- W4228997629 creator A5084561137 @default.
- W4228997629 date "2022-05-06" @default.
- W4228997629 modified "2023-10-16" @default.
- W4228997629 title "Nano Scale Investigations, Domain Structure, and Switching Processes of Low‐Dimensional Ferroelectric Layered Chalcogenides" @default.
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- W4228997629 doi "https://doi.org/10.1002/9783527837175.ch9" @default.
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