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Ultra-sensitive Magnetic Microscopy with an Optically Pumped Magnetometer.

Young Jin Kim¹, Igor Savukov¹

¹P-21, Los Alamos National Laboratory, P.O. Box 1663, MS-D454, Los Alamos, NM 87545, USA.

Scientific Reports

|April 23, 2016

Summary

We developed an ultra-sensitive magnetic microscope using optically pumped magnetometers (OPMs) and flux guides (FGs). This device achieves high resolution (80 μm) and sensitivity (8.1 pT) for microscopic magnetic field measurements.

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Area of Science:

Physics
Biophysics
Materials Science

Background:

Optically pumped magnetometers (OPMs) are leading non-cryogenic magnetic field sensors.
High-resolution, high-sensitivity magnetic microscopy is crucial for neuroscience and other fields.

Purpose of the Study:

To develop an ultra-sensitive magnetic microscope by combining a spin-exchange relaxation-free (SERF) OPM with flux guides (FGs).
To improve magnetic field measurement resolution and sensitivity for small magnetic objects.

Main Methods:

Integrated a centimeter-size SERF OPM with flux guides.
Employed experimental and numerical methods to investigate device performance.
Conducted numerical calculations of magnetic field distribution and noise in flux guides.

Main Results:

Achieved high resolution of 80 μm and high sensitivity of 8.1 pT with an optimized FG-OPM device.
Quantified magnetic noise originating from flux guide domain fluctuations.
Demonstrated the potential for detecting micro-biological magnetic fields and nanoparticles.

Conclusions:

The developed FG-OPM magnetic microscope offers a unique combination of high resolution and sensitivity.
The device shows promise for applications in micro-biological field detection, nanoparticle sensing, and non-destructive testing.
Theoretical estimates suggest FG-OPMs could detect single neuron magnetic fields, advancing neuroscience research.