Non-equilibrium spin-current induced by random Rashba field

The influence of inhomogeneous Rashba interaction on spin-transport of two-dimensional electron gas system (2DEG) is investigated. In the works which have been previously performed in this field it has been shown that in the non-equilibrium regime, the Rashba and Dresselhaus couplings cannot be responsible for spin-current and both transverse and longitudinal components of the spin-current identically vanish. In the present work by using a semi-classical method it was found out that a random Rashba field interaction cannot be considered as a underestimate effect on spin-dependent mechanisms. Regarding the inhomogeneous distribution of the Rashba field it was shown that the spin-current of the system, in general, does not go all the way to zero

The role of the Rashba coupling in dynamical induced electromotive force: a Berry curvature investigation

A Berry curvature investigation has been made on the magnetic modulated structures such as domain walls (DWs) and helimagnetic spin configurations. Results of the present study show that the geometry of the spin configuration and the direction of the magnetic field creating the spin precession are of crucial importance in the magnitude of obtained electromotive force. It has recently been recognized that the Rashba coupling increases significantly the electromotive force when this coupling is high enough to give predominant contribution in the magnetization dynamics. However, in the opposite case when the Rashba interaction has negligible contribution in the magnetization dynamics it was shown that the magnitude of the electromotive force decreases slightly by increasing the Rashba coupling strength. Therefore the effect of the Rashba interaction in the electromotive force of the moving DWs rests largely on the strength and also effectiveness of this interaction in the magnetization dynamics