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Broadband multi-magnon relaxometry using a quantum spin sensor for high frequency ferromagnetic dynamics sensing.
Brendan A McCullian1, Ahmed M Thabt2, Benjamin A Gray3
1Department of Physics, The Ohio State University, Columbus, OH, 43210, USA. mccullian.1@osu.edu.
Nature Communications
|October 17, 2020
Summary
Researchers used nitrogen-vacancy (NV) centers in diamond to detect spin waves in magnetic materials. This new method overcomes previous frequency limitations, enabling broader study of magnon dynamics.
Area of Science:
- Condensed Matter Physics
- Quantum Sensing
- Magnonics
Background:
- Sensitive local probes are crucial for understanding magnon dynamics.
- Nitrogen-vacancy (NV) centers in diamond are promising quantum spin sensors with long spin lifetimes.
- Previous NV sensing of ferromagnetic dynamics was limited by NV spin resonance frequency.
Purpose of the Study:
- To demonstrate ensemble NV detection of spin waves generated via nonlinear instability.
- To overcome the frequency limitations of previous NV sensing techniques.
- To explore magnon-NV interactions in different frequency regimes.
Main Methods:
- Utilizing ensemble NV centers in diamond as quantum spin sensors.
- Generating spin waves via parametric driving of a nonlinear instability.
- Employing one- and multi-magnon NV relaxometry techniques.
- Varying the wavevector of driven spinwave modes up to 3 × 10^6 m^-1.
Main Results:
- Demonstrated NV detection of spin waves with nonzero wavevector.
- Observed NV relaxation in both one-magnon and multi-magnon regimes.
- Showed NV relaxation occurs even when no individual magnons are resonant with NV frequencies.
- Found NV relaxation amplitude increases with driven spinwave mode wavevector.
Conclusions:
- Ensemble NV centers can detect driven spin waves below and above NV frequencies.
- Multi-magnon scattering plays a role in NV relaxation.
- This work expands the capabilities of NV centers for probing magnonics.
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