Subatomic-scale resolution with SPM: Co adatom on p(2 × 1)Cu(110):O
R Turanský1, K Palotás1,2, J Brndiar1
1Center for Comp. Mat. Science, Inst. of Physics, Slovak Acad. of Sciences, 84511 Bratislava, Slovakia.
Nanotechnology
|December 8, 2018
Summary
Scanning probe microscopy (SPM) can image subatomic magnetic features. Near-contact atomic force microscopy (AFM) resolves orbital asymmetry in cobalt (Co) d shells, crucial for understanding magnetism.
Area of Science:
- Surface Science
- Atomic and Magnetic Force Microscopy
- Quantum Chemistry
Background:
- Scanning probe microscopy (SPM) offers subatomic resolution for surface studies.
- Understanding orbital magnetic features is key to nanoscale magnetism.
Purpose of the Study:
- To investigate the limits of SPM for imaging orbital magnetic features.
- To analyze a model system of a cobalt (Co) atom on a p(2×1)Cu(110):O surface.
Main Methods:
- Scanning tunneling spectroscopy (STS) to determine Co d shell occupation and Hubbard U value in DFT+U modeling.
- Near-contact atomic force microscopy (AFM) in the small-amplitude regime.
Main Results:
- STS successfully determined Co d shell occupation and Hubbard U.
- AFM can image the asymmetry arising from partially filled d shells at close distances.
- A faint asymmetry in electrostatic force is predicted due to Co's ionic character.
Conclusions:
- SPM techniques, particularly near-contact AFM, can resolve subatomic orbital magnetic asymmetries.
- These findings are crucial for advancing nanoscale magnetic imaging and materials science.
- The study provides a framework for imaging more complex transition metal adsorbates.
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