Micro-RDS study of magneto-optical effect on Bi[subscript 2]Te[subscript 3] and La[subscript 0.82]Ba[subscript 0.18]CoO[subscript 3]

Reflection anisotropy spectroscopy (RAS) is a non-destructive optical probe of surfaces which is widely used in different environments for science research since its development in the late 80’s. For several advantages compared with conventional techniques, RDS provides insight into atomic and electronic structure and morphology of surfaces and interfaces in widely different environments. In this study, we will introduce our micro-Reflectance Difference Spectroscopy (RDS) system from the basic principles of how it works to its typical applications as a magneto-optic microscopic system. We would like also to optimize the basic RDS experiment instruments as well as some additional modifications for variable research purposes. Magneto-optic effect played a central role in the development of electromagnetic theory and atomic physics. In most of this thesis, I will systematically introduce both the principles and real cases of my study of the magneto-optical effects of typical advanced materials like Bi2Te3 thin film and La0.82Ba0.18CoO3 single crystal samples. No-uniform spin polarization domains were firstly found on topological insulator surface by our magneto-optic microscope. Anisotropy behaviors were found with external magnetic field, electron current flow and various low temperatures. Anisotropic magnetic behaviors were also found on the surface of La0.82Ba0.18CoO3 single crystal. The magnetization of Bi2Te3 was proved to be in-plane while that of La0.82Ba0.18CoO3 was off-plane