Probing Magnetism in Artificial Metal-Organic Complexes Using Electronic Spin Relaxometry

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Information Science

Background:

• Single spins are crucial for nanoscale information devices.
• Metal-organic frameworks offer tunable platforms for controlling atomic spin properties.
• Understanding metal-molecule interactions is key to engineering spin behavior.

Purpose of the Study:

• To investigate the magnetic robustness of single iron (Fe) atoms within Fe-tetracyanoethylene (TCNE) complexes.
• To explore the impact of complex formation on magnetic anisotropy and spin relaxation dynamics.
• To map the spin center's location within the complex using advanced microscopy.

Main Methods:

• Low-temperature scanning tunneling microscopy (STM) for atomic manipulation and imaging.
• STM-based spin relaxometry for spatially resolved magnetic property mapping.
• Density functional theory (DFT) calculations to support experimental observations.

Main Results:

• The magnetic anisotropy and spin relaxation of Fe atoms remain unperturbed within Fe-TCNE complexes.
• DFT calculations indicate minimal disturbance to Fe 3d orbitals, with 4s and 4p orbital rearrangement.
• STM spin relaxometry precisely located the spin center within the complex.

Conclusions:

• Atomic magnetic properties can be preserved when embedded in weakly bound molecular frameworks.
• Fe-TCNE complexes demonstrate the potential for stable single-atom magnets in molecular architectures.
• This research paves the way for robust nanoscale magnetic information storage.