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Magnetoimpedance Effect in the Ribbon-Based Patterned Soft Ferromagnetic Meander-Shaped Elements for Sensor

Zhen Yang1,2, Anna A Chlenova3,4, Elizaveta V Golubeva5

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Summary

This study explores magnetoimpedance (MI) sensors made from patterned ferromagnetic materials for detecting liquid drops. The meander-shaped sensors show high sensitivity for high-frequency applications.

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Magnetoimpedance effectamorphous ribbonsmagnetic field sensormeander sensitive elementpatterned ribbons

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Area of Science:

  • Materials Science
  • Physics
  • Engineering

Background:

  • Amorphous and nanocrystalline soft magnetic materials are crucial for advanced sensor technologies.
  • The magnetoimpedance (MI) effect in ferromagnetic materials offers potential for sensitive detection applications.

Purpose of the Study:

  • To investigate the MI effect in lithographically patterned, meander-shaped ferromagnetic sensor elements.
  • To evaluate the performance of these sensors for detecting small liquid volumes.

Main Methods:

  • Fabrication of meander-shaped sensor elements from cobalt-based amorphous ribbon using lithography and chemical etching.
  • Design and testing of three-turn and six-turn meander structures with varying dimensions.
  • Characterization of MI ratio and sensitivity at high frequencies (around 45-50 MHz).
  • Comparative analysis using magneto-optical Kerr technique.

Main Results:

  • The S4 meander design achieved a maximum MI ratio (ΔZ/Z) of approximately 250% with a sensitivity of 36%/Oe at 45 MHz.
  • A significant MI ratio for the real part (ΔR/R) of 250% with 32%/Oe sensitivity was observed at 50 MHz.
  • Chemical etching and sample length critically influenced surface magnetic properties and MI performance.
  • The sensors demonstrated suitability for analyzing large drops (0.1-500 μL) of water-based samples.

Conclusions:

  • The designed ferromagnetic meander-shaped sensor elements exhibit excellent MI properties.
  • These sensors are recommended for high-frequency applications, particularly for large drop analysis.
  • The study highlights the impact of fabrication parameters on sensor performance.