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A Spin Valve-Based Rhombus-Shaped Micro-Object Implementing a Full Wheatstone Bridge.

Mikhail Milyaev¹, Larisa Naumova¹, Anastasiya Germizina¹

¹M.N. Mikheev lnstitute of Metal Physics, Ural Branch, Russian Academy of Sciences, S. Kovalevskoi Street 18, Ekaterinburg 620990, Russia.

Sensors (Basel, Switzerland)

|January 23, 2024

Summary

Researchers developed novel spin valves with synthetic antiferromagnets. Thermomagnetic treatment created unique magnetic properties in rhombus shapes, enabling sensitive magnetic field sensors for switching devices.

Keywords:

Wheatstone bridge exchange bias field magnetic anisotropy shape anisotropy spin valve

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Spin valves are crucial for magnetic sensors.
Synthetic antiferromagnets offer tunable magnetic properties.
Controlling magnetic anisotropy is key for device performance.

Purpose of the Study:

To fabricate and characterize spin valves with synthetic antiferromagnets.
To investigate the effect of thermomagnetic treatment on micro-fabricated spin valve structures.
To develop a novel magnetic sensor element based on these structures.

Main Methods:

Magnetron sputtering for spin valve fabrication.
Micro-fabrication of rhombus-shaped structures.
Thermomagnetic treatment to induce unidirectional anisotropy.
Characterization of magnetic properties and sensor performance.

Main Results:

Fabricated spin valves exhibited excellent microstructure and smooth interfaces.
RKKY interaction dominated ferromagnetic layer coupling.
Thermomagnetic treatment successfully induced exchange bias with opposite signs on rhombus sides.
Developed a full Wheatstone bridge sensor with high sensitivity and hysteresis.

Conclusions:

Thermomagnetic treatment is effective in creating specific magnetic anisotropies in micro-objects.
The fabricated sensor elements demonstrate promising characteristics for switching applications.
This work advances the design of sensitive magnetic field sensors.