Stabilization and thickness dependence of depletion charge induced domains in ferroelectric nano capacitors
Mısırlıoğlu, Burç and Yıldız, Mehmet (2011) Stabilization and thickness dependence of depletion charge induced domains in ferroelectric nano capacitors. In: Joint Conference on IEEE International Symposium on Applications of Ferroelectrics (ISAF/PFM)/ International Symposium on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials, Vancouver, Canada
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We analyze the domain structures as well as the phase transition temperatures in films with depletion charges. Due to depletion charges, saw-tooth like domain structures can develop spanning the entire film thickness in films with perfect electrode screening, i.e., ideal electrodes if the film is above a critical thickness. Transition temperature in films with dead layers does not depend nearly at all on the depletion charge density unless it is very high (>10(26) ionized impurities/m(3)). Relatively thick films (>8 nm in this work) with dead layers that have very high depletion charge densities have transition temperatures similar to those with the same charge density but with ideal electrodes, making us conclude that thick films with high depletion charge densities will not feel the dead layer effects. The results are provided for (001) BaTiO(3) films grown on (001) SrTiO(3) substrates with pseudomorphic top and bottom metallic electrodes.
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