Spin Manipulation by Creation of Single-Molecule Radical Cations

Area of Science:

• Surface science
• Molecular physics
• Organic chemistry

Background:

• All-trans-retinoic acid (ReA) is an organic molecule with potential applications in molecular electronics.
• Investigating molecular behavior on conductive substrates is crucial for developing novel electronic devices.

Purpose of the Study:

• To investigate the electronic and spin properties of all-trans-retinoic acid (ReA) molecules on a Au(111) surface.
• To explore the possibility of controlling individual molecular spin states.

Main Methods:

• Scanning tunneling microscopy (STM) for atomic-scale imaging.
• Scanning tunneling spectroscopy (STS) for electronic property analysis.
• High magnetic field measurements to probe spin states.

Main Results:

• Single ReA molecules on Au(111) can exist in multiple states, some with localized spin.
• The spin state of individual ReA molecules can be reversibly switched on and off.
• Spin manipulation of one molecule does not affect neighboring molecules.

Conclusions:

• ReA molecules on Au(111) can be converted to radical species via electron abstraction.
• The controllable spin states of ReA molecules suggest potential for molecular spintronics.
• This study demonstrates a method for manipulating individual molecular spins on a surface.