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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Low-Frequency Magnetic Sensing Using Magnetically Modulated Microcavity Resonant Mode.

Xinrong Yang¹, Jiamin Rong², Enbo Xing¹

¹Key Laboratory of Dynamic Testing Technology, School of Instrument and Electronics, North University of China, Taiyuan 030051, China.

|April 26, 2025

Summary

This summary is machine-generated.

This study introduces a novel low-frequency magnetic sensor using a microcavity. The device achieves high sensitivity and low noise for detecting weak magnetic fields, advancing microcavity magnetic sensing technology.

Keywords:

low-frequency magnetic sensing microcavity resonant mode whispering gallery mode

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Area of Science:

Physics
Materials Science
Optical Engineering

Background:

Microcavity resonators are sensitive to external stimuli.
Low-frequency magnetic field sensing presents unique challenges.
Optical readout methods offer high precision.

Purpose of the Study:

To develop a novel low-frequency magnetic sensing method.
To utilize magnetically modulated microcavity resonant modes for sensing.
To enhance the performance of microcavity-based magnetometers.

Main Methods:

A magnetically sensitive unit was created by combining an AC excitation coil with a microcavity.
The microcavity's resonant mode was modulated by AC amplitude-modulated signals.
Signal processing of the resonant spectrum was employed to extract magnetic signals.

Main Results:

The sensor demonstrated a sensitivity of 12.49 V/mT for a 0.5 Hz magnetic field.
A bias instability noise level of 16.71 nT was achieved.
The measurable frequency range of the whispering gallery mode microcavity magnetometer was extended.

Conclusions:

The proposed method offers a viable approach for low-frequency magnetic field detection.
This work represents a significant development in microcavity magnetic sensing.
The study highlights advancements in optical readout for microcavity sensors.