Dynamic spin phenomena in complex structures based on ferromagnetic metals and semiconductors (scientific summary)

A brief review of theoretical and experimental studies of spin phenomena in various hybrid structures based on magnetically ordered metals and semiconductors is presented. In particular, the following issues are addressed: (i) the effects of electrically driven switching of the magnetization with the minimum energy loss; (ii) ferromagnetic ordering in Mn-doped GaAs-AlGaAs quantum wells, which is stimulated by filling the upper Hubbard band; (iii) the analytical and numerical studies of magnetic excitations in nanocomposites formed by ferromagnetic granules; (iv) theoretical studies of spin effects in strongly disordered semiconductor structures; and (v) isotropic magnetoresistance linear in the magnetic field, experimentally observed in GaAs-AlGaAs doped quantum wells, which is attributed to some ordering in the system of localized spins.