AVS 63rd International Symposium & Exhibition
    Scanning Probe Microscopy Focus Topic Tuesday Sessions
       Session SP+AS+MI+NS+SS-TuA

Paper SP+AS+MI+NS+SS-TuA8
Controlling Kondo Effect of Magnetic Molecules on Au(111) by Small Molecule Binding

Tuesday, November 8, 2016, 4:40 pm, Room 104A

Session: Probing Spin-Dependent Phenomena
Presenter: MinHui Chang, Korea University, Republic of Korea
Authors: M.H. Chang, Korea University, Republic of Korea
S.J. Kahng, Korea University, Republic of Korea
Y.H. Chang, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea
H.W. Kim, Korea University, Republic of Korea
S.H. Lee, Korea University, Republic of Korea
Y.-H. Kim, KAIST, 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. Here, we demonstrate that spin interactions of Co-porphyrin on Au(111) can be controlled by adsorption and desorption of small molecules, 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 effect in STS, whereas Co-porphyrin adsorbed small molecules showed modified zero-bias peaks, with reduced full width half maximum or Kondo temperature. Our density functional theory calculation results explain it with spatial redistribution of unpaired spins in dz2 Orbitals. Our study opens up ways to tune molecular spin interactions by means of chemical binding.