Exploring of magnetic properties of magnetic molecules at interface

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The relationship of magnetic properties(spin state, magnetic anisotropy, ordering) of iron phthalocyanine with metal surfaces was investigated by single molecule spectroscopy with a scanning tunneling microscope. The spin excitaion spectum and Zeeman splitting caused by external magnetic fields were successfully measured for individual molecules. Depending on the coupling strength at the molecule-substrate interface, the spin state is changed from S=1 to S=0. On oxidized Cu surface, the adsorption-induced switching of magnetic anisortropy takes place. The novel SU(4) Kondo effect is observed on Au(111), which provides an intriguing example that the symmetry of local site plays a vital role in the strongly-correlated many-body phenomena such as Kondo effect. Two-dimensional molecular Kondo lattice was realized for the first time where the Kondo effect at individual molecules competes with the antiferromagnetic spin-spin couplings mediated by the substrate electrons.