2011 年 32 巻 3 号 p. 120-127
By introducing spin degrees of freedom in materials and devices, we can create new functionalities. This article overviews the studies on the control of spins (creation, injection, accumulation, relaxation, transport, and detection) and relations of spin-related properties with magnetic, electrical, optical, and thermal properties. Developments of semiconductor-based materials with spin-related functions are reviewed. Future issues and prospects for device applications are also described.