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Diamond magnetometer enhanced by ferrite flux concentrators
Ilja Fescenko1, Andrey Jarmola2,3, Igor Savukov4
1Center for High Technology Materials and Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87106, USA.
Physical Review Research
|October 29, 2020
Summary
Researchers enhanced diamond magnetometers using magnetic flux concentrators. This breakthrough achieves unprecedented sensitivity for low-frequency magnetic field detection, opening doors for new applications.
Area of Science:
- Quantum sensing
- Solid-state physics
- Materials science
Background:
- Nitrogen-vacancy (NV) centers in diamond enable room-temperature magnetometry.
- Current NV-diamond magnetometers have limited sensitivity (~10 pT s1/2) at low frequencies (≾1 kHz).
- This sensitivity limitation restricts applications in fields like medical imaging and geoscience.
Purpose of the Study:
- To improve the sensitivity of NV-diamond magnetometers at low frequencies.
- To overcome the limitations of current diamond sensor technology.
- To enable new applications requiring high-sensitivity magnetic field detection.
Main Methods:
- Utilized high-permeability magnetic flux concentrators to amplify magnetic fields.
- Employed a bowtie configuration with an NV-doped diamond membrane between ferrite cones.
- Implemented a dual-resonance modulation technique to mitigate thermal effects on NV spin levels.
Main Results:
- Achieved a ~250-fold increase in magnetic field amplitude within the diamond sensor.
- Demonstrated a magnetic field sensitivity of ~0.9 pT s1/2 between 10 and 1000 Hz.
- Showcased the effectiveness of structured magnetic materials in enhancing diamond sensor performance.
Conclusions:
- Magnetic flux concentrators significantly boost the sensitivity of NV-diamond magnetometers.
- The developed technique overcomes previous sensitivity limitations for low-frequency magnetic fields.
- This advancement offers a new design paradigm for diamond-based sensors using magnetic field manipulation.
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