Speaker
Description
The integration of organic molecules with ferromagnetic surfaces is a promising approach to advance spintronic applications. Organic molecules provide tuneable electronic and spin-related properties, such as weak spin-orbit coupling and long spin coherence times. The ferromagnetic substrate provides the spin-polarized states necessary for spin injection and detection. The interaction between molecular orbitals and the ferromagnetic substrate plays a crucial role in controlling the spin-dependent transport and magnetic coupling at the interface.
This work focuses on the visualization of molecular orbitals on ferromagnetic surfaces at room temperature. The difficulty here is the lack of ordered or aligned molecular films on magnetic substrates to resolve molecular orbitals with ARPES. By depositing ultrathin cobalt films on Au(111) as a ferromagnetic platform, we achieve the formation of extended, self-assembled molecular structures. Using these molecular structures, we can combine spin- and momentum-resolved photoemission spectroscopy with photoemission orbital tomography to study the orbitals of the adsorbed molecules. Our analysis reveals how the molecules arrange on the cobalt surface, producing distinct photoemission signatures associated with individual molecular orbitals.