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Electret integrated magnetic field sensor based on magnetostrictive polymer composite with nT resolution.

Lukas Zimoch1, Stefan Schröder2, Eric Elzenheimer3

  • 1Functional Nanomaterials, Department of Materials Science, Kiel University, Kaiserstr. 2, 24143, Kiel, Germany. luzi@tf.uni-kiel.de.

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A new magnetostrictive polymer composite (MPC) sensor offers highly sensitive magnetic field detection. This novel sensor achieves a significantly lower limit of detection than existing technologies.

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Physics

Background:

  • Advanced magnetoelectric field sensors are crucial for biomedical, robotics, and automotive applications.
  • Existing sensors often lack comprehensive magnetic characterization.
  • Magnetostrictive polymer composites (MPCs) offer tunable properties for sensor development.

Purpose of the Study:

  • Introduce a novel capacitive read-out based MPC sensor element.
  • Characterize the magnetic properties of the MPC sensor comprehensively.
  • Improve the limit of detection (LoD) for magnetic field sensing.

Main Methods:

  • Development of a capacitive read-out based MPC sensor element.
  • Independent tailoring of mechanical and magnetic properties of the sensor.
  • Comprehensive magnetic characterization of the sensor performance.

Main Results:

  • Achieved a limit of detection (LoD) of 95.6 nT/√Hz at 160.5 Hz, three orders of magnitude lower than other composite sensors.
  • Reduced LoD by a factor of 20 compared to electret-based magnetoelectric (ME) sensors.
  • Demonstrated the first comprehensive magnetic characterization of an MPC sensor.

Conclusions:

  • The developed MPC sensor offers a versatile and tuneable platform for magnetic field detection.
  • The sensor exhibits superior sensitivity and a significantly improved LoD.
  • This work establishes a benchmark for characterizing novel MPC magnetic field sensors.