Light-driven modulation of proximity-enhanced functionalities in hybrid nano-scale systems.

Area of Science:

• Nanotechnology
• Quantum Information Science
• Materials Science

Background:

• Advancing quantum information and communication technology necessitates smaller, faster components with controllable functionalities.
• Optical control of magnetic properties is crucial for next-generation electronic devices.

Purpose of the Study:

• To present an all-optical strategy for dynamically modulating magnetic properties using light-controlled proximity effects.
• To demonstrate this concept in hybrid nanoscale systems for ultrafast magnetic control.

Main Methods:

• Utilized hybrid nanoscale systems comprising C₆₀ molecules proximitized to a cobalt metallic ferromagnetic surface.
• Employed resonant ultrashort light pulses to induce excitons in C₆₀ molecules.
• Detected changes using a specifically designed time-resolved Magneto-Optical Kerr Effect (tr-MOKE) experiment.

Main Results:

• Demonstrated significant modification of the Cobalt/C₆₀ interface interaction via light-induced excitons.
• Observed a remarkable 60% transient shift in the frequency of the Cobalt dipolar ferromagnetic resonance mode.
• Confirmed that the observed effect persists on a timescale of hundreds of picoseconds.

Conclusions:

• Established a new material platform for ultrafast optical control of magnetism at the nanoscale.
• Showcased that the transient frequency shift correlates with changes in the anisotropy field, vital for technological applications.
• The findings pave the way for novel optical modulation of magnetic properties in quantum devices.