Highly Ordered Surface Self-Assembly of Fe4 Single Molecule Magnets

Single molecule magnets (SMMs) have attracted considerable attention due to low-temperature magnetic hysteresis and fascinating quantum effects. The investigation of these properties requires the,possibility to deposit well-defined monolayers or spatially isolated molecules within a well-controlled adsorption geometry. Here we present,a successful fabrication Of Self-organized arrays of Fe-4. SMMs on hexagonal boron nitride (h-BN) on Rh(111) as template. Using a rational design of the ligand shell Optimized for surface assembly and electrospray as a gentle deposition method, we demonstrate how to obtain ordered arrays of molecules forming perfect hexagonal superlattices of tunable size, from small islands to an almost perfect monolayer. High-resolution low temperature scanning tunneling microscopy(STM) reveals that the Fe-4 molecule adsorbs on the substrate in a flat geometry, meaning that its magnetic easy axis is perpendicular to the surface. By scanning tunneling spectroscopy (STS) and density functional theory (DFT) calculations, we infer that the majority- and minority-spin components of the Spin-split lowest unoccupied molecular orbital (LUMO) can be addressed separately on a submolecillar level.