Precise Control of Local Spin States in an Adsorbed Magnetic Molecule with an STM Tip: Theoretical Insights from First-Principles-Based Simulation
2018
The precise tuning of local spin states in adsorbed organometallic molecules by a mechanically controlled
scanning tunneling microscope(STM) tip has become a focus of recent experiments. However, the underlying mechanisms remain somewhat unclear. We investigate theoretically the STM tip control of local spin states in a single iron(II) porphyrin molecule adsorbed on the Pb(111) substrate. A combined density functional theory and hierarchical equations of motion approach is employed to simulate the tip tuning process in conjunction with the
complete active spaceself-consistent field method for accurate computation of
magnetic anisotropy. Our
first-principles-based simulation accurately reproduces the tuning of
magnetic anisotropyrealized in experiment. Moreover, we elucidate the evolution of geometric and electronic structures of the composite junction and disclose the delicate competition between the Kondo resonance and local spin excitation. The understanding and insight provided by the
first-principl...
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