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Updated: May 28, 2026

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
09:43

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

An anisotropic magneto resistive sensor with set/reset field.

D F He1, M Shiwa

  • 1National Institute for Materials Science, 1-2-1 Sengen Tsukuba, Ibaraki 305-0047, Japan. he.dongfeng@nims.go.jp

The Review of Scientific Instruments
|October 7, 2011
PubMed
Summary

A novel set/reset magnetic field method enhances anisotropic magnetoresistance (AMR) sensors, significantly reducing low-frequency noise. This technique improves magnetic field resolution and signal-to-noise ratio for applications like magnetic particle detection.

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Anisotropic magnetoresistance (AMR) sensors are susceptible to low-frequency noise, limiting their resolution.
  • Low-frequency noise and thermal disturbances affect the performance of AMR sensors in sensitive applications.

Purpose of the Study:

  • To develop a set/reset magnetic field method to mitigate low-frequency noise in AMR sensors.
  • To enhance the magnetic field resolution and signal-to-noise ratio of AMR sensors.

Main Methods:

  • Implementation of a set/reset magnetic field technique with an AMR sensor.
  • Evaluation of the sensor's performance at frequencies below 30 Hz.
  • Assessment of magnetic particle detection capabilities and thermal disturbance effects.

Main Results:

  • Achieved a three-fold improvement in magnetic field resolution below 30 Hz.
  • Obtained a magnetic field resolution of approximately 150 pT/√Hz at 1 Hz.
  • Successfully canceled thermal disturbance effects and improved signal-to-noise ratio by three times in magnetic particle detection.

Conclusions:

  • The set/reset magnetic field method effectively reduces low-frequency noise in AMR sensors.
  • This technique significantly enhances AMR sensor performance for high-resolution magnetic field sensing and particle detection.
  • The improved signal-to-noise ratio demonstrates the method's utility in overcoming environmental challenges.