Realization of High Spin Injection Through Chiral Molecules and Its Application in Logic Device

Abstract

Achieving highly efficient spin injection has been a challenging problem for a long time in spin logic devices. The chiral-induced spin selectivity (CISS) effect could induce spin polarization of electron transmission by chiral structure, providing a promising solution to resolve the above bottleneck. In this work, the significant CISS effect by self-assembled chiral organic molecules with helical structure was achieved on the copper (Cu) substrate covered with gold (Au) layer. We find that the spin polarization induced by the chiral molecules is more than 80%. Serving as an ultra efficient spin filter, the chiral organic molecules is demonstrated to be an effective way to generate pure spin currents and achieve highly efficient spin injection without ferromagnetic electrodes or external magnetic field. Based on these properties, a CISS based reconfigurable logic device is proposed. Due to the high spin injection efficiency, this CISS based device can realize 6 different logic operations with low energy consumption (1.2 pJ) and high speed (3.6 ns).