AVS 64th International Symposium & Exhibition
    Nanometer-scale Science and Technology Division Thursday Sessions
       Session NS-ThP

Paper NS-ThP8
Controlling Kondo Resonances of Magnetic Molecules on Au(111) by Binding of Metal Atoms

Thursday, November 2, 2017, 6:30 pm, Room Central Hall

Session: Nanometer-scale Science and Technology Poster Session
Presenter: MinHui Chang, Korea University, Republic of Korea
Authors: M.H. Chang, Korea University, Republic of Korea
Y.H. Chang, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea
H. Kim, Korea University, Republic of Korea
S.H. Lee, Korea University, Republic of Korea
Y.H. Kim, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea
S.-J. Kahng, Korea University, Republic of Korea
Correspondent: Click to Email
Controlling and sensing spin states of magnetic molecules at the single molecule level is essential for spintronic molecular device applications. The exchange coupling between magnetic-molecules and metallic substrates has been actively studied by measuring Kondo resonances at Fermi level. The resonances have been controlled by small molecule bindings, but not by adsorption of metal atoms to magnetic-molecules. Here, we demonstrate that Kondo resonances of Co-porphyrin on Au(111) can be controlled by adsorption of metal atoms, and be sensed using scanning tunneling microscopy and spectroscopy (STM and STS). Bare Co-porphyrin showed a clear zero-bias peak, a signature of Kondo resonances in STS, whereas Co-porphyrin adsorbed metal atoms showed modified zero-bias resonances, with reduced full width half maximum or Kondo temperature. Our density functional theory calculation results explain it with spatial redistribution of unpaired spins in d-orbitals of Co-porphyrin by the adsorption of metal atoms. Our study shows that the spin-state of metallo-porphyrin can be modified in multiple ways by the adsorption of additional metal atoms, and be probed through Kondo resonances with STS.