Journal
NANO LETTERS
Volume 15, Issue 7, Pages 4546-4552Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01120
Keywords
Single-molecule magnet; hexagonal boron nitride; scanning tunneling microscopy; scanning tunneling spectroscopy; density functional theory; electrospray deposition
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB 767]
- Carl Zeiss foundation
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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.
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