Highly flexible anisotropic magnetoresistance sensor for wearable electronics

Area of Science:

• Materials Science
• Electrical Engineering
• Physics

Background:

• Wearable devices require highly flexible magnetic sensors for tracking and positioning.
• Anisotropic magnetoresistance (AMR) sensors offer stable magnetoresistance ratios and simple fabrication.
• The mechanical stability of AMR sensors under bending is not well-understood.

Purpose of the Study:

• To develop and evaluate a flexible AMR magnetic sensor with enhanced anti-fatigue properties.
• To investigate the performance of AMR sensors on ultra-thin flexible substrates under various bending conditions.

Main Methods:

• Fabrication of an AMR magnetic sensor on an ultra-thin Kapton substrate.
• Testing the sensor's stability and sensitivity under repeated bending at curvatures from 1/3 to 1/10 mm⁻¹.
• Quantifying the sensor's sensitivity after 500 bending cycles.

Main Results:

• The flexible AMR sensor demonstrated excellent anti-fatigue behavior across a range of bending curvatures.
• Sensitivity remained high at 0.25 Oe⁻¹ even after 500 bending cycles.
• The sensor maintained its performance on the ultra-thin Kapton substrate.

Conclusions:

• The proposed flexible AMR magnetic sensor exhibits promising durability for wearable applications.
• The sensor's stability under mechanical stress makes it a viable candidate for next-generation flexible electronics.
• Further development could integrate this sensor into various wearable tracking and positioning systems.