Polarization curves of Langmuir–Blodgett PVDF-copolymer films

In addition to our previous work, we report on further experimental results concerning Langmuir–Blodgett polyvinylidenefluoride-copolymer thin films. Polarization hysteresis loops and polarization switching behaviour of samples with thicknesses below 3 nm were measured. Also, the time and temperature comportments of the remanent polarization were investigated for various film thicknesses, ranging from 2.7 up to 63.8 nm. The remanent polarization shows a loss of about 10% over 3 decades of time, ranging from 100 to 2 · 10 5 s. For thinner films, the remanent polarization exhibits the typical behaviour of a first-order transition, whereas for thicker samples a diffuse transition is found. Initial polarization curves obtained from the unpolarized state were finally measured. They are temperature and thickness dependent.