The Transmission Coefficient And The Spin-tunneling Time Of The F/s/f Heterojunction

Our model is a ferromagnetic/semiconductor/ferromagnetic heterojunction which has a tunnel barrier in the boundary of ferromagnetic/semiconductor and an asymmetrical electric field bringing about Rashba spin-orbit coupling to the semiconductor. Considering the tunnel barrier and Rashba spin-orbit coupling we calculate the transmission coefficient and the spin-tunneling time of the spinning electron in the ferromagnetic/semiconductor/ferromagnetic heterojunction.1. The effects of the tunnel barrier are noticed. The tunnel barrier can change the phase of the spin-dependent electron's transmission coefficient and the transmission coefficient of the spin-dependent electron reduces with the growth of tunnel barrier.2. With the strengthening of Rashba spin-orbit coupling, the oscillation frequency of the transmission coefficient increases. The spin-tunneling time of the spin-up electrons extends with the strengthening of Rashba spin-orbit coupling and the spin-tunneling time of the spin-down electrons is shortened with the strengthening of Rashba spin-orbit coupling.3. When the magnetic moments in the ferromagnetic electrodes are parallel or anti parallel, the transmission coefficient of spin-dependent electrons assumes invariable oscillation. In other conditions the transmission coefficient of spin-dependent electrons does not assume invariable oscillations. The spin-tunneling time of the spin electrons extends with the lengthening of the semiconductor.