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Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis

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Mapping AC susceptibility with quantum diamond microscope.

Shishir Dasika¹, Madhur Parashar¹, Kasturi Saha¹

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

The Review of Scientific Instruments

|May 1, 2023

Summary

This summary is machine-generated.

We developed a new method using nitrogen-vacancy (NV) centers in diamond to measure AC susceptibility in micro-scale magnetic materials with high spatial resolution.

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Area of Science:

Quantum sensing
Materials science
Magnetism

Background:

Micro-scale magnetic materials are crucial in various scientific fields.
Accurate measurement of their AC susceptibility is challenging at the micro-scale.
Existing techniques lack the required spatial resolution and sensitivity.

Purpose of the Study:

To present a novel technique for micro-scale AC susceptibility measurement.
To utilize nitrogen-vacancy (NV) centers in diamond for magnetic field sensing.
To achieve high spatial resolution and quantitative data acquisition.

Main Methods:

Employing NV centers in diamond as magnetic field sensors.
Utilizing a quantum diamond microscope with a lock-in camera for high-speed imaging.
Implementing a secondary sensor to isolate excitation fields.
Performing pixel-by-pixel detection of NV photoluminescence.

Main Results:

Demonstrated AC susceptibility measurements of soft permalloy micro-magnets.
Achieved a spatial resolution of 1.2 µm and a field of view of 100 µm.
Operated at excitation frequencies up to 20 Hz.
Successfully quantified the magnetic state of micro-scale magnetic structures.

Conclusions:

The developed technique enables microscopic measurement of AC susceptibilities.
This method is applicable to magnetic materials in physical, biological, and material sciences.
It opens new avenues for nanoscale magnetic characterization.