Speaker
Description
Spintronics, the way forward to device miniaturization, leverages electron spin rather than charge. Though inorganic materials were predominantly given more attention in spin transport studies, organic semiconductor (OSC)/magnetic hybrid interfaces are quickly gaining interest, owing to the flexibility, scalability, and structural tunability of organic materials. Here, we probe the effect of chirality of the OSC on the spin-charge conversion efficiency and spin selectivity in hybrid heterostructures via spin pumping. For this, we probe the inverse spin Hall effect (ISHE) in a ferrimagnetic insulator/ heavy-metal/ OSC heterostructure and systematically dope the conjugated achiral polymer F8T2 with the chiral small molecule 1-aza[6]helicene. When we induce chirality in the F8T2 layer with opposite enantiomers of the dopant molecule, we observe a clear sign reversal in the spin selectivity. These results open the door to chiral doping as an effective tool to control spin injection across hybrid interfaces.
