According to an embodiment of the present invention, a spin device includes an intermediate semiconductor region arranged between a first terminal and a second terminal, wherein the first terminal is adapted to provide a current having a first degree of spin polarization to the intermediate semiconductor region, and wherein the second terminal is adapted to output the current having a second degree of spin polarization. The spin device further includes a spin selective scattering structure abutting the intermediate semiconductor region, the spin selective scattering structure being adapted such that the first degree of spin polarization is altered to be the second degree, wherein the spin selective scattering structure comprises a control electrode being electrically insulated from the intermediate semiconductor region, and wherein the control electrode is adapted to apply an electrical field perpendicular to a direction of the current through the intermediate semiconductor region to control a magnitude of the current.