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Dual-Layer Anomalous Hall Effect Sensor for Enhanced Accuracy and Range in Magnetic Field Detection
Sitong An1, Lvkang Shen1, Tianyu Liu1
1School of Microelectronics, Xi'an Jiaotong University, Xi'an 710049, China.
Nanomaterials (Basel, Switzerland)
|April 11, 2025
Summary
This study presents a novel NiCo2O4-based sensor using epitaxial strain to enhance magnetic field sensing accuracy and range. The device achieves ultrahigh sensitivity for precise measurements and a wide range for diverse applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Magnetic field sensors are critical in various technological applications.
- Enhancing both sensitivity and measurement range of sensors remains a key challenge.
- Anomalous Hall effect (AHE) sensors offer potential for miniaturization and high performance.
Purpose of the Study:
- To develop a novel NiCo2O4-based anomalous Hall effect sensor with improved accuracy and extended measurement range.
- To investigate the effect of epitaxial strain on the magnetic properties and sensor performance.
- To design a multi-range magnetic field sensor for versatile applications.
Main Methods:
- Fabrication of a NiCo2O4/MgAl2O4/NiCo2O4/MgAl2O4 heterostructure.
- Introduction of epitaxial strain using a MgAl2O4 cover layer to modulate magnetic anisotropy.
- Design of a dual-layer Hall bar structure with varied NiCo2O4 layer thicknesses.
Main Results:
- Achieved ultrahigh sensitivity of 10,000 V/(AT) within a ±0.1 mT range.
- Demonstrated a competitive sensitivity of 60 V/(AT) within a ±5 mT range.
- Realized an ultra-wide measurement range of ±1000 mT by reducing the top NiCo2O4 layer thickness.
Conclusions:
- The NiCo2O4-based AHE sensor demonstrates significant potential for enhanced magnetic sensing.
- Strain engineering provides an effective method to tune sensor characteristics like sensitivity and range.
- The developed compact, multi-range sensor is promising for advanced magnetic sensing technologies.
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