Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2016)
    Nanomaterials Monday Sessions
       Session NM-MoM

Paper NM-MoM3
Reversible Single-Molecular Manipulations of Spin Trans-Effect in Co-porphryin/Au(111) with Conserved Spin Moment

Monday, December 12, 2016, 8:40 am, Room Hau

Session: Magnetic Properties
Presenter: Se-Jong Kahng, Korea University, Korea
Authors: M.H. Chang, Korea University, Republic of Korea
Y.H. Chang, orea Advanced Institute of Science and Technology (KAIST), Korea
H. Kim, Korea University, Republic of Korea
S.-H. Lee, Korea University
Y.-H. Kim, Korea Advanced Institute of Science and Technology (KAIST), Korea
S.-J. Kahng, Korea University, Korea
Correspondent: Click to Email
Controlling spin interactions in magnetic-molecules/metal is essential for spintronic molecular device applications. It has been considered that small molecule coordination to magnetic-molecules/metal can be used to reset molecular spins from 1/2 to zero and from zero to 1/2. However, the study on the control of spin interactions without changing spin moment of magnetic-molecules has been rare. Here, we demonstrate that spin interactions in Co-porphyrin/Au(111) can be controlled while spins being conserved, by coordination and de-coordination of small gaseous molecules, using scanning tunneling microscopy and spectroscopy (STM and STS). With small moleculecoordination, we observed that a zero-bias peak at Co-porphryin, a signature of Kondo effect in STS, remained but was clearly showed reduced width i.e. Kondo temperature, and that it could be reversibly retrieved by single molecular STM manipulations. Based on our density functional theory calculation results, the reduced Kondo temperature is explained with the relocation of unpaired spins in dz2 orbitals of Co-porphyrin by vertical coordination of small molecules. Our study shows that with conserved spin moment in magnetic-molecules/metal, spin version of trans-effect can be directly probed through Kondo effect with STS.