Work

Dual-Layer Anomalous Hall Effect Sensor for Enhanced Accuracy and Range in Magnetic Field Detection

Year: 2025

Type: article

Abstract: This study introduces a method aimed at enhancing both the accuracy and the range of magnetic field sensors, which are two critical parameters, in a novel NiCo2O4-based anomalous Hall effect sensor. To fine-tune the linear range of the sensor, we introduced epitaxial strain using a MgAl2O4 cover layer, which significantly influenced the strain-modulated magnetic anisotropy. A NiCo2O4/MgAl2O4/NiCo2O4/MgAl2O4 heterostructure was further constructed, achieving differentiation in the material characteristics across both upper and lower NiCo2O4 layers through the modulation of thickness and strain. A dual-layer Hall bar was designed to enhance the integration of the sensor, offering varied detection ranges. This approach enabled the realization of ultrahigh sensitivity, measuring 10,000 V/(AT) within a ±0.1 mT range, and a competitive sensitivity of 60 V/(AT) within a ±5 mT range. By reducing the thickness of the top NiCo2O4 layer, an ultra-wide measurement range of ±1000 mT was also achieved. These results highlight the considerable promise of NiCo2O4-based anomalous Hall effect devices as compact, multi-range tools in the domain of magnetic sensing technology.

Source: Nanomaterials

DOI: 10.3390/nano15070527

Authors: Sitong An, Lvkang Shen, Tianyu Liu, Yan Wang, Qiuyang Han, Ming Liu

Institution: Xi'an Jiaotong University

Language: English

Topic: Magnetic Field Sensors Techniques

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,896

Funders: National Natural Science Foundation of China, Fundamental Research Funds for the Central Universities