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Sensing Single-Molecule Magnets with Nitrogen-Vacancy Centers.
Ariel Smooha1, Jitender Kumar1, Dan Yudilevich1
1Department of Chemical and Biological Physics, Weizmann Institute of Science, 7610001 Rehovot, Israel.
Nano Letters
|January 29, 2026
Summary
Single-molecule magnets (SMMs) can now be characterized at room temperature using diamond nitrogen-vacancy (NV) centers. This breakthrough enables studying SMMs for advanced magnetic memory applications.
Area of Science:
- Nanotechnology
- Materials Science
- Quantum Sensing
Background:
- Single-molecule magnets (SMMs) are promising for nanoscale magnetic memory.
- Characterizing SMMs on surfaces at room temperature is a significant challenge.
- Existing nanoscale techniques are often specialized and limited.
Purpose of the Study:
- To develop a novel method for characterizing SMMs under realistic conditions.
- To utilize single nitrogen-vacancy (NV) centers in diamond as a sensitive magnetic sensor.
- To investigate the magnetic properties of SMMs at room temperature and low temperatures.
Main Methods:
- Depositing cobalt-based SMMs onto a diamond surface.
- Using single NV centers in diamond to detect SMM magnetic noise.
- Measuring NV relaxation and decoherence times at 296 K and 5-8 K.
- Inferring SMM magnetic noise spectral density (NSD) and magnetic properties.
Main Results:
- Observed significant influence of SMMs on NV relaxation and decoherence times at room and low temperatures.
- Inferred SMM magnetic noise spectral density (NSD) and underlying magnetic properties.
- Demonstrated the effect of applied magnetic fields on SMM NSD at low temperatures.
Conclusions:
- Single NV centers provide nanoscale sensitivity for characterizing SMMs.
- This method allows SMM characterization under realistic surface-bound conditions.
- The technique is crucial for advancing SMMs as magnetic memory bits.
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