Spintronics is an emergent interdisciplinary topic for the studies of spin-based, other than or in addition to charge-only-based physical phenomena, which promises not only new capabilities of electronic devices, but also abundant science. For applied materials, the spin ordering has long been investigated within the context of conventional ferromagnetic materials (FMs), while the study of spin generation, relaxation, and spin-orbit coupling (SOC) in semiconductors (SCs) took off only recently with the advent of spintronics and it is here that many novel materials and FM/SC hybrid structures can find their greatest potential in both science and technology. In the pursuit for such goals, the intrinsic material properties are important indicators and the artificially synthetized hybrid systems (layered FM/SC structures and FM-doped SCs) are valuable models for studying spindependent phenomena and could potentially be used as actual components for an eventual spintronic device. These results are expected to contribute to some of the most fundamental questions of the contemporary spintronic materials research, such as the FM/SC interfacial hybridization and magnetism, the spin and orbital ordering of ferrites, and the fundamental magnetism of doped TIs, and the proximity effects in FM/DMS and FM/doped TI heterostructures.