Advances in chemistry, materials science and solid state physics are providing insights into the magnetic behaviour of matter in correlation to its electronic structure. They open promising perspectives for commercially applied "intelligent" materials. Combining state-of-the-art knowledge, this open series of volumes provides a comprehensive overview of developments and new physical properties. By keeping a balance between theory and experiment, the series guides advanced students and specialists alike in this interdisciplinary field and serve as a reference source, valuable to all concerned with the phenomena of magnetism.