Thesis (M.Sc.) - Cairo University - National Institute of Laser Enhanced Sciences - Department of Laser Sciences and Interaction

Multiferroic materials exhibit unique properties such as simultaneous existence of two or more of coupled ferroic order parameters (ferromagnetism, ferroelectricity, ferroelasticity or their anti - ferroic counterparts) in a single material. Recent years have seen a huge research interest in multiferroic materials for their potential application as sensors and actuators. However, the scarcity of these materials in single phase and the weak coupling of their ferroic components have directed the research towards multiferroic heterostructures. These systems operate by coupling the magnetic and electric properties of two materials, generally a ferromagnetic material and a ferroelectric material via strain. In this thesis, thin films have been grown by chemical solution deposition (CSD) using spin coating technique using rotations peed of 4500 rpm and time of 50 s and dried at 120 {u00BA}C for 20 min and Pulsed Laser deposition (PLD) using nanosecond laser technique using (Nd - YAG laser) ~ coherent US ~ with a wavelength of 532 nm and pulse duration of 9 ns delivered an average power of 250 mWatt. The optical, dielectric, magnetic, ferroelectric, ferromagnetic and piezoelectric properties of thin films have been investigated. The optical properties, crystal structure, magnetization, particle shape, and surface morphology of the films were investigated by UV/VIS/ NIR spectrophotometer (300 - 2500) nm, X - Ray diffraction (XRD), vibrating sample magnometer (VSM), transmission electron microscope (TEM), and Scanning electron microscope (SEM), respectively

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