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Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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

Lili Pan^1,2, 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.

|January 30, 2025

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 skin modulus-distributed structure omnidirectional stretchability sensor array spin-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.