Scaling of the coercive field in ferroelectrics at the nanoscale

The scaling of the coercive field in ferroelectric films at the nanoscale is investigated experimentally. The scaling in the films of copolymer vinylidene fluoride and BaTiO$_3$ with thickness equal by the order of value to the critical domain nucleus size $1$–$10$ nm reveals deviation from the well known Kay and Dunn low. At this thickness region coercive field does not depend on thickness and coincides with Landau–Ginzburg–Devonshire value.