Speaker
Description
The phenomenon of the chiral-induced spin selectivity (CISS) effect refers to the spin-polarization of electrons in the presence of chiral molecules or structures. Their potential for high polarization efficiencies makes hybrid chiral molecule / magnet devices promising for efficient and sustainable spintronic devices. Despite various experimental reports on different facets of the CISS effect, understanding the underlying mechanisms is still a major challenge. In this work, we explore the vectorial nature of the CISS effect with supramolecular chiral adsorbates in hybrid metal / chiral molecule heterostructures. Using angle-resolved spin pumping, we inject a pure spin current in a Au thin film to probe the spin-to-charge conversion at the chiral interface. To maximize the polarization efficiency, we investigate the CISS effect in the well-ordered system of Bromium-oxoamide single crystals that are physisorbed on the Au via lamination. Through a combination of in-plane and out-of-plane measurements, we identified a single axis that maximizes the CISS efficiency.
Our results confirm a high sensitivity of the CISS effect to the orientation of the crystal relative to the spin direction, and demonstrate that the CISS effect does not need to rely on chemical bonds, but also works with physisorbed molecular structures. These findings open new ways for the vectorial manipulation and functionalization of hybrid spintronic devices through chirality.
