Berlin 2005 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 10: FV-internes Symposium „Anorganische Dielektrika für die künftige Mikro- und Nanotechnologie"

DS 10.3: Hauptvortrag

Samstag, 5. März 2005, 11:30–12:15, TU HS110

The role of interfaces in nanosize ferroelectrics oxides — •Marin Alexe, Lucian Pintilie, and Dietrich Hesse — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle

Multifunctional ferroelectric oxide materials offer a wide range of useful properties from switchable polarization that can be applied in memory devices to piezoelectric and pyroelectric properties used in actuators, transducers and thermal sensors. Generally speaking at the nanometer scale material properties are expected to be different. Fundamental problems such as the super-paraelectric limit, the influence of the free surface, and of the interface and bulk defects on ferroelectric switching, etc. arise when scaling down ferroelectrics. In order to study these size effects, fabrication methods of high quality nanoscale ferroelectric crystals have been developed. The present talk will briefly review self-patterning and self-assembly fabrication methods, including chemical routes, morphological instability of ultrathin films, microemulsion, and self-assembly lift-off, employed up to the date to fabricate ferroelectric nanoscale structures with lateral size in the range of few tens of nanometers. In depth structural and electrical investigations of interfaces performed to differentiate between intrinsic and extrinsic size effects will also be presented.