Size-Dependent Ultrafast Spin Dynamics in Triangulene-Based π-d Hybrid Systems

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Mechanics

Background:

• Hybrid π-d magnetic systems offer tunable spin properties.
• Geometric scaling is a key strategy for manipulating these properties.
• Triangulene nanoflakes (TNFs) provide a versatile platform for such investigations.

Purpose of the Study:

• To investigate the size-dependent static electronic structures of Co- and Cu-doped TNFs.
• To explore laser-driven ultrafast spin dynamics in these doped systems.
• To understand the interplay between transition-metal magnetism and the π-carbon framework.

Main Methods:

• Systematic size-dependent computational analysis.
• Investigation of static electronic structures.
• Simulation of laser-driven ultrafast spin dynamics.

Main Results:

• TNF size variation alters the balance between transition-metal and π-magnetism, creating distinct electronic and spin states.
• Co-doped TNFs exhibit robust local spin flips; Cu-doped TNFs show spin-transfer capabilities.
• A collective spin-flip mechanism mediated by transient π-d interaction was observed in specific doped TNFs.

Conclusions:

• Geometric scaling significantly impacts ultrafast spin dynamics in Co- and Cu-doped TNFs.
• Findings provide insights into π-d-assisted spin dynamics.
• Offers guidance for designing advanced graphene-based spintronic devices.