The goal of this thesis was to study multiferroicmaterials systems in thin film and multilayer forms in order to explorethe possibility of fabricating room temperature thin film devices.
Inparticular, we have focused on two types of multiferroic materialssystems: (1) intrinsic multiferroic/magnetoelectric thin film materialsand (2) magnetostrictive/piezoelectric bilayer systems for investigationof the strain-mediated magnetoelectric (ME) effect.
Among them, BiFeO3 (BFO) is of particular interest because it is one of the very few known single phase multiferroic materials which simultaneously possesses ferroelectric and magnetic orders above room temperature.
After a general description of the underlying concepts and computational techniques, we focus on BiFeO3, which is probably the most intensively studied multiferroic.
Multiferroic materials and multiferroic materials systems whichsimultaneously exhibit ferroelectricity and magnetism have attractedgreat attention because of their exotic physical properties and theirpotential applications which utilize coupling of magnetism andferroelectricity.