The new field of semiconductor spintronics represents a possible direction towards the development of hybrid devices that could perform logic operations, communication and storage, within the same material technology. This book provides a critical analysis of the mechanisms responsible of spin relaxation and applied the Monte Carlo method to investigate the significant case of electrons in bulk GaAs. It includes the results obtained by Dr. Stefano Spezia during his three-year Ph.D. in Applied Physics, under the supervision of Prof. Dominique Persano Adorno, and in collaboration with Dr....