| AVS 62nd International Symposium & Exhibition | |
| Scanning Probe Microscopy Focus Topic | Friday Sessions |
| Session SP+AS+MI+NS+SS-FrM |
| Session: | Probe-Sample Interactions |
| Presenter: | Taeyoung Choi, IBM Almaden Research Center |
| Authors: | T. Choi, IBM Almaden Research Center W. Paul, IBM Almaden Research Center S. Baumann, IBM Almaden Research Center C.P. Lutz, IBM Almaden Research Center A. Heinrich, IBM Almaden Research Center |
| Correspondent: | Click to Email |
The interplay of single atoms and their local environment on surfaces influences the atoms’ spin excitations and dynamics, which can be utilized in progress toward atomic-scale memory and quantum information processing. We find that spin-excitation energy of Fe atoms on an insulating MgO film shifts depending on the tip-to-atom separation. This may be attributed to the electric field across the tunneling junction, as well as to local charge and structural changes around the atom. The Kelvin Probe Force Microscopy (KPFM) has been very useful tool to measure changes of local contact potential differences between a tip and a sample at the atomic level [1]. In this talk, we employ tuning fork KPFM/STM and show preliminary results on the charge character and spin excitations of Fe atoms.
This work is supported by grants from IBM.
[1] Leo Gross et al., Phys. Rev. B 90, 155455 (2014).