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Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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Note: high sensitivity self-bias magnetoelectric sensor with two different magnetostrictive materials.

Lei Chen1, Ping Li, Yumei Wen

  • 1Research Center of Sensors and Instruments, College of Optoelectronic Engineering, Chongqing University, Chongqing City 400044, People's Republic of China.

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Summary

This study presents a novel self-bias magnetoelectric (ME) sensor for detecting weak alternating current (ac) magnetic fields. The new sensor demonstrates a significantly enhanced ME voltage coefficient, offering improved sensitivity for magnetic field detection.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electrical Engineering

Background:

  • Magnetoelectric (ME) sensors are crucial for detecting magnetic fields.
  • Existing sensors often require external DC magnetic bias fields for optimal performance.
  • There is a need for highly sensitive, self-biased sensors for weak AC magnetic field detection.

Purpose of the Study:

  • To design, fabricate, and characterize a novel self-bias magnetoelectric (ME) sensor.
  • To achieve a high ME voltage coefficient without external DC bias.
  • To demonstrate the sensor's capability for detecting weak AC magnetic fields.

Main Methods:

  • Utilized two different magnetostrictive materials to create a magnetization gradient.
  • Engineered an internal magnetic field to enhance the ME response.
  • Fabricated and characterized the sensor's performance under varying AC magnetic field conditions.

Main Results:

  • Achieved a low-frequency ME voltage coefficient (dVME∕dHac) of 22.11 mV∕Oe at zero DC bias.
  • The achieved coefficient is 17.69 times higher than previous PMN-PT based sensors.
  • Demonstrated a high resonant ME voltage coefficient of 2.73 V∕Oe.
  • Observed an excellent linear relationship between ME voltage and AC magnetic field from ~10(-7) Oe to 1 Oe.

Conclusions:

  • The developed self-bias ME sensor exhibits superior performance for weak AC magnetic field detection.
  • The sensor's design overcomes the need for external DC bias, simplifying practical applications.
  • The high sensitivity and linear response make it suitable for various sensing applications.