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High dynamic-range and portable magnetometer using ensemble nitrogen-vacancy centers in diamond.

Himanshu Kumar¹, Shishir Dasika¹, Maheshwar Mangat¹

¹Department of Electrical Engineering, Indian Institute of Technology Bombay, Powai, Maharashtra 400076, India.

The Review of Scientific Instruments

|July 12, 2024

Summary

This summary is machine-generated.

Researchers developed a compact Quantum MagPI magnetometer using nitrogen vacancy (NV) centers in diamond. This portable device achieves high sensitivity for real-time magnetic field tracking.

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Area of Science:

Quantum sensing
Solid-state physics
Magnetometry

Background:

Nitrogen vacancy (NV) centers in diamond possess unique quantum properties, making them promising for sensing applications.
Previous magnetometers often lack compactness and portability, limiting their field deployment.

Purpose of the Study:

To develop a compact and portable magnetometer utilizing an ensemble of NV centers.
To characterize the performance of this magnetometer, including sensitivity, dynamic range, and real-time tracking capabilities.

Main Methods:

Fabrication of a compact sensor assembly and integrated control electronics for the NV magnetometer.
Implementation of closed-loop feedback control to lock to the NV center resonance frequency.
Performance evaluation through noise spectra analysis, Allan deviation measurements, and real-time magnetic field tracking.

Main Results:

The Quantum MagPI magnetometer is housed in compact enclosures (10x10x7 cm³ sensor, 30x25x5 cm³ electronics).
Achieved a bandwidth normalized sensitivity of approximately 10 nT/√Hz.
Extended the linear dynamic range to 200 μT using closed-loop feedback, a 20-fold improvement.
Demonstrated real-time tracking of nT-level magnetic fields, including elevator movement and door openings.

Conclusions:

The developed Quantum MagPI is a highly sensitive, compact, and portable magnetometer based on NV centers.
Its extended dynamic range and real-time tracking capabilities make it suitable for various ambient condition sensing applications.
This technology offers a promising platform for practical magnetic field sensing outside of laboratory environments.