Abstract
VDF-TrFE copolymer thin film of molar composition 70/30 and thickness below 70 nm has been prepared by spin coating on glass substrate covered with aluminum electrode. After polarization at room temperature by some hysteresis cycles, the linear and second order permittivities e 1 and e 2 have been studied over temperature in a heating and cooling cycle up to 120 °C i.e., above the Curie temperature. The temperature dependence of polarization is derived from e 1 and e 2 . It is found that above Curie temperature and after cooling to room temperature a non-switchable polarization remains. This non-switchable polarization points from the bottom to the top electrode and is not influenced by the initial polarization direction.
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