Molecular spin can couple with electrons of metal substrates. Depending on the strength of the coupling spin state of the molecule changes. Examples are given for Iron phthalocyanine (Fe-Pc) adsorbed on Cu, Au and Ag.  With strong coupling with Cu(110) the spin is completely killed whereas if decoupled as on Cu(110) 2x1-O, spin survives with change in the direction of easy axis.  On Au weak coupling leads to appearance of Kondo state, where a competition between the RKKY interaction affects the spin state .  Kondo state of FePc on Au depends on the adsorption site, where the difference was originating from the coupling with the substrate electrons.

Single molecule spectroscopy of spin state at surfaces

245th National Meeting (2013)

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