|
This article is cited in 197 scientific papers (total in 198 papers)
REVIEWS OF TOPICAL PROBLEMS
Two-dimensional ferroelectrics
L. M. Blinova, V. M. Fridkina, S. P. Paltoa, A. V. Buneb, P. A. Dowbenb, S. Ducharmeb a Institute of Cristallography Russian Academy of Sciences, Moscow
b Department of Physics and Astronomy, University of Nebraska-Linkoln
Abstract:
The investigation of the finite-size effect in ferroelectric crystals and films has been limited by the experimental conditions. The smallest demonstrated ferroelectric crystals had a diameter of ≈200 Å and the thinnest ferroelectric films were ≈200 Å thick, macroscopic sizes on an atomic scale. Langmuir–Blodgett deposition of films one monolayer at a time has produced high quality ferroelectric films as thin as 10 Å, made from polyvinylidene fluoride and its copolymers. These ultrathin films permitted the ultimate investigation of finite-size effects on the atomic thickness scale. Langmuir–Blodgett films also revealed the fundamental two-dimensional character of ferroelectricity in these materials by demonstrating that there is no so-called critical thickness; films as thin as two monolayers (1 nm) are ferroelectric, with a transition temperature near that of the bulk material. The films exhibit all the main properties of ferroelectricity with a first-order ferroelectric–paraelectric phase transition: polarization hysteresis (switching); the jump in spontaneous polarization at the phase transition temperature; thermal hysteresis in the polarization; the increase in the transition temperature with applied field; double hysteresis above the phase transition temperature; and the existence of the ferroelectric critical point. The films also exhibit a new phase transition associated with the two-dimensional layers.
Received: July 20, 1999
Citation:
L. M. Blinov, V. M. Fridkin, S. P. Palto, A. V. Bune, P. A. Dowben, S. Ducharme, “Two-dimensional ferroelectrics”, UFN, 170:3 (2000), 247–262; Phys. Usp., 43:3 (2000), 243–257
Linking options:
https://www.mathnet.ru/eng/ufn1723 https://www.mathnet.ru/eng/ufn/v170/i3/p247
|
Statistics & downloads: |
Abstract page: | 344 | Full-text PDF : | 98 | References: | 35 | First page: | 1 |
|