Spin-orbit force due to Rashba coupling at the spin resonance condition

We analyze the effect of Rashba type of spin-orbit (SO) coupling on the electron dynamics and the rf electrical conductivity. We show that in addition to the momentum current an additional SO current occurs which can be attributed to a SO contribution to the electric Lorentz force. This Rashba SO force is proportional to the time derivative of the electron magnetization. Therefore, in a static electromagnetic field SO interaction does not affect the electric or the spin current. Applying an rf electric current, however, an rf magnetization can be efficiently induced via the rf Rashba field. Thus, at the Larmor frequency a characteristic current induced electron spin resonance occurs. There the absorbed electric power is efficiently converted into magnetic energy. DOI: 10.1103/PhysRevB.86.245318