This book contains all information regarding magnetism and magnetic materials that an electrical engineer needs to know to be able to understand and design magnetic devices.The handbook comprises chapters comprising basic electromagnetism, basic quantum mechanics, ferromagnetism, magnetic materials, magnetic material characterization, modeling of magnetic materials, and magnetic design. A comprehensive description of the physical origin of magnetism of materials is given chapter two and a thorough review of the physics behind ferromagnetism is given in chapter three.All chapters are written in a textbook fashion such that they can easily be assimilated separately. The book gathers in an understandable the multidisciplinary topic of magnetism and magnetic materials in way that it can serve as a comprehensive introduction to engineers that considers use of magnetic materials in their designs.The book covers all major modeling techniques of magnetic materials including the well-known Presiach, Jiles-Atherton and lag models. General magnetic design approaches including major and new design tools also are presented.The book also serves as a guideline regarding the choice of feasible materials in specific applications regarding both soft and hard magnetic materials with an inventory of alternatives to electrical steel. Relevant performance criteria then are given such that appropriate materials can be selected. The final chapter offers a list of current electrical steel and magnetic material suppliers.