Origin of magnetism - orbital and spin - Langevin theory of paramagnetism - Weiss theory of ferromagnetism - Theory of ferri and antiferromagnetism - Exchange interaction -Superexchange interaction- Bethe-Slater Curve- Slater Pauling curve - Magnetic anisotropy  - Domain theory - Hard and soft magnetic materials - classification according to anisotropy - Intrinsic and extrinsic magnetic properties - Curie temperature - Spinel Ferrites, garnets, hexaferrites and perovskites- Structure and  Classification -FeSi-FeCo- Properties at nanoscale- Fine particle magnetism - Superparamagnetism - Surface spin effects - Single domain limit - Permanent magnetic materials - Applications of hard and soft magnetic materials - Biomedical - Recording - High frequency - EMI suppression