Half-Metallicity and Slater-Pauling Behaviour in the Ferromagnetic Heusler Alloys -- Role of Structural Defects on the Half-Metallic Character of Heusler Alloys and Their Junctions With Ge and GaAs -- Magnetism And Structure of Magnetic Multilayers Based on the Fully Spin Polarized Heusler Alloys Co2NnGe and Co2MnSn -- Epitaxial Growth of NiMnSbon GaAs by Molecular Beam Epitaxy -- Growth and Ma…