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Updated: May 30, 2025

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Omnidirectionally Stretchable Spin-Valve Sensor Array with Stable Giant Magnetoresistance Performance.

Lili Pan1,2, Yali Xie1, Huali Yang1

  • 1CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China.

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|January 30, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed an omnidirectionally stretchable spin-valve sensor array for electronic skin. This flexible magnetic sensor maintains stable performance under complex deformations and high strain, advancing wearable magnetoelectronics.

Keywords:
magnetosensitive electronic skinmodulus-distributed structureomnidirectional stretchabilitysensor arrayspin-valve

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Area of Science:

  • Materials Science
  • Electronics Engineering
  • Physics

Background:

  • Flexible magnetic sensors are crucial for applications like electronic skin due to their deformability and noncontact detection.
  • Existing sensors struggle with complex, omnidirectional human skin deformations, limiting their performance and durability.
  • There is a need for highly stretchable magnetic sensors that maintain stable performance under various strains.

Purpose of the Study:

  • To demonstrate an omnidirectionally stretchable spin-valve sensor array with high stretchability and stable performance.
  • To overcome the limitations of current flexible magnetic sensors in withstanding complex deformations.
  • To enable advanced applications in magnetosensitive electronic skin and wearable devices.

Main Methods:

  • Integration of a modulus-distributed structure with liquid metal to achieve omnidirectional stretchability.
  • Fabrication of a spin-valve sensor array designed to withstand complex deformations.
  • Testing sensor performance, including giant magnetoresistance ratio and sensitivity, under various strain conditions.

Main Results:

  • The spin-valve sensor array achieved omnidirectional stretchability up to 86% strain.
  • Maintained a stable giant magnetoresistance ratio of 8% and a maximum sensitivity of 0.93%/Oe.
  • Demonstrated stable performance without fatigue for over 1000 stretching cycles.

Conclusions:

  • The developed sensor array offers high stretchability and stable magnetic field sensing under complex deformations.
  • This technology is suitable for magnetosensitive electronic skin and other wearable electronic applications.
  • Provides a foundation for next-generation stretchable and wearable magnetoelectronics.