Ferroelectric materials with interfaces [Elektronische Ressource] : first principles calculations / Kourosh Rahmanizadeh

Ferroelectric Materials with Interfaces:First Principles CalculationsVon der Fakulta¨t fu¨r Mathematik, Informatik und Naturwissenschaften der RWTHAachen University zur Erlangung des akademischen Gradeseines Doktors der Naturwissenschaftengenehmigte Dissertationvorgelegt vonMaster of ScienceKourosh Rahmanizadehaus Ahvaz (Iran)Berichter: Universita¨tsprofessor Dr. Stefan Blu¨gelUniversita¨tsprofessor Dr. Uwe KlemradtTag der mu¨ndlichen Pru¨fung: 02.02.2011Diese Disseration ist auf Internetseiten der Hochschulbibliothek online verfu¨gbar.AbstractFerroelectric Materials with Interfaces:First Principles CalculationsFerroelectric materials are characterized by a reversible spontaneous electric po-larization in the absence of an electric field. This polarization arises from a non-centrosymmetric arrangement of the ions in the unit cell that produces an electricdipole moment. Ferroelectric materials have been extensively studied in recent yearsbecause of their promising properties for a wide range of applications, ranging fromthree-dimensional trenched capacitors for dynamic random access memories and ul-trafast switching to cheap room-temperature magnetic-field detectors, piezoelectricnanotubes for microfluidic systems and electrocaloric coolers for computers.Experimental studies have shown that defects, stacking faults and domain bound-aries play an important role in ferroelectric materials.