Spin-state-dependent electrical conductivity in single-walled carbon nanotubes encapsulating spin-crossover molecules

Area of Science:

• Materials Science
• Nanotechnology
• Molecular Electronics

Background:

• Spin crossover (SCO) molecules offer potential as nanoscale magnetic switches, but face challenges like instability and poor control in spintronic devices.
• Downscaling SCO systems requires solutions for their insulating nature and precise placement in nanodevices.

Purpose of the Study:

• To demonstrate the encapsulation of robust Fe-based SCO molecules within single-walled carbon nanotubes (SWCNTs).
• To investigate the SCO mechanism's endurance and the positioning of these heterostructures in nanoscale transistors.
• To explore how SWCNT encapsulation influences SCO properties and enables device integration.

Main Methods:

• Encapsulation of Fe-based SCO molecules within the 1D cavities of SWCNTs.
• Fabrication and characterization of individual heterostructures in nanoscale transistors.
• Measurement of electrical conductance and SCO transition properties.

Main Results:

• The SCO mechanism is preserved after encapsulation within SWCNTs.
• Individual SCO-SWCNT heterostructures can be positioned in nanoscale transistors.
• SCO switching induces significant conductance bistability in the SWCNT.
• Encapsulation leads to a shift in SCO transition to higher temperatures and introduces hysteresis, indicating a memory effect.

Conclusions:

• SWCNT encapsulation provides a robust platform for positioning and readout of SCO molecules in nanodevices.
• This approach facilitates the tuning of SCO magnetic properties at the nanoscale.
• The study paves the way for developing advanced nanoscale spintronic devices utilizing SCO molecules.