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Micron-scale anomalous Hall sensors based on magnetic thin films

ORAL

Abstract

Magnetic sensors have been widely applied in industrial productions and have great potential in magnetic imaging, microscopy, and biomedical applications. Anomalous Hall sensors, owing to their superior properties including the miniaturized size, simple fabrication procedures, broad frequency response and high sensitivity, have attracted great attention. In this talk, we will review our recent works on anomalous Hall sensors based on single magnetic layers [1, 2] and interlayer exchange-coupled magnetic thin films [3]. We will show how the magnetic anisotropy (perpendicular vs. in-plane anisotropy), interlayer exchange coupling (ferromagnetic vs. antiferromagnetic coupling) and material compositions (Co40Fe40B20 vs. FexPt1-x (0<x<1)) affect their sensitivity, detectability, dynamic reserve and the energy efficiency.

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Publication: [1] Yiou Zhang, Kang Wang, Gang Xiao, Noise characterization of ultrasensitive anomalous Hall effect sensors based on Co40Fe40B20 thin films with compensated in-plane and perpendicular magnetic anisotropies. Appl. Phys. Lett. 116, 212404 (2020). https://doi.org/10.1063/5.0008949 <br>[2] Kang Wang, Yiou Zhang, Shiyu Zhou, Gang Xiao, Micro-scale anomalous Hall sensors based on FexPt1-x thin films with a large Hall angle and near the spin-reorientation transition. Nanomaterials 11, 854 (2021). https://doi.org/10.3390/nano11040854 <br>[3] Kang Wang, Yiou Zhang, Gang Xiao, Anomalous Hall sensors with high sensitivity and stability based on interlayer exchange-coupled magnetic thin films. Phys. Rev. Appl. 13, 212404 (2020). https://doi.org/10.1103/PhysRevApplied.13.064009

Presenters

  • Kang Wang

    Brown University

Authors

  • Kang Wang

    Brown University

  • Yiou Zhang

    Brown University

  • Gang Xiao

    Brown University