Switchable Spin Filters in Magnetic Molecular Junctions Based on Quantum Interference
Lin Huang, Shi‐Zhang Chen, Yu‐Jia Zeng, Dan Wu, Bo‐Lin Li, Yexin Feng, Zhi-Qiang Fan, Li‐Ming Tang, Ke‐Qiu Chen
Abstract
Abstract The ability to control the degree of spin in molecular junctions (MJs) is attractive for their applications in spintronics. Here, it is demonstrated that spin‐resolved quantum interference (SQI) can effectively improve spin‐filtering behavior of MJs. By first‐principle calculations in combination with nonequilibrium Green's function investigations, spin‐resolved charge transport in graphene/Cr‐porphyrin/graphene MJs shows that, due to the SQI, the tunable spin filtering behaviors can be achieved by changing the length of molecule. The SQI related phase coherence/decoherence in these MJs is revealed by considering the effects of temperature and electron–phonon interactions. Furthermore, a higher spin filtering efficiency in low bias region can be obtained by Cr‐doped in single‐porphyrin junction, due to the Cr‐enhanced SQI. These results show great potential for the application of MJs with SQI in the molecular intergrated circuit and provide a promising way for designing spin molecular devices by using quantum interference.