Driving spin transition at interface: Role of adsorption configurations

Area of Science:

• Materials Science
• Surface Science
• Quantum Chemistry

Background:

• Designing molecule-based spintronic devices requires understanding electrical control of molecular spins at interfaces.
• Manganocene physisorbed on metallic surfaces presents a model system for studying spin transitions.

Purpose of the Study:

• To investigate the electrically driven spin transition in manganocene on a metallic surface.
• To understand the influence of adsorption configuration on spin-state response to electric fields.

Main Methods:

• Ab initio calculations with Hubbard-U correction and van der Waals interactions.
• Analysis of spin-state energetics and binding energy shifts.
• Investigating the effects of electric fields on molecular spin states.

Main Results:

• An electric field induces a high-spin to low-spin transition in flat-lying manganocene.
• The standing-up manganocene configuration shows minimal change in its high-spin ground state.
• Spin-state response is attributed to molecule-surface binding energy shifts, not ligand field variations.

Conclusions:

• Electrical bias can selectively control spin states in different manganocene adsorption configurations.
• Binding energy shifts are key to configuration-dependent spin-crossover under electrical bias.
• Provides an intuitive understanding for designing spintronic devices based on molecular spin control.