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Article

Micron-Scale Anomalous Hall Sensors Based on FexPt1−x Thin Films with a Large Hall Angle and near the Spin-Reorientation Transition

Department of Physics, Brown University, Providence, RI 02912, USA
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Victor Kuncser
Nanomaterials 2021, 11(4), 854; https://doi.org/10.3390/nano11040854
Received: 15 February 2021 / Revised: 17 March 2021 / Accepted: 23 March 2021 / Published: 27 March 2021
In this work, we fabricate and characterize an energy-efficient anomalous Hall sensor based on soft-magnetic FexPt1−x thin films with a large anomalous Hall angle. By varying the composition of the FexPt1−x alloy, its layer thickness and interfacial materials, the magnetization is tuned to be near the spin transition between the perpendicular and in-plane reorientations. We performed magneto-transport and noise characterizations on anomalous Hall sensors with a small sensing area of 20 × 20 µm2 in the 180 to 350 K temperature range. We found the best performance in a 1.25-nm-thick Fe0.48Pt0.52 sandwiched by two 1.6-nm-thick MgO layers at room temperature. The sensor has a large anomalous Hall angle of 1.95%. Moreover, it has the best field detectability of 237.5 nT/√Hz at 1 Hz and 15.3 nT/√Hz at 10 kHz, as well as a high dynamic reserve of 112.0 dB. These results suggest that the FexPt1−x alloy system is suitable for energy-efficient anomalous Hall sensors, particularly in micro-sensing applications. View Full-Text
Keywords: anomalous Hall sensors; FePt alloys; perpendicular magnetic anisotropy; spin–orbit coupling; noise characterizations; micro-sensing and imaging anomalous Hall sensors; FePt alloys; perpendicular magnetic anisotropy; spin–orbit coupling; noise characterizations; micro-sensing and imaging
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MDPI and ACS Style

Wang, K.; Zhang, Y.; Zhou, S.; Xiao, G. Micron-Scale Anomalous Hall Sensors Based on FexPt1−x Thin Films with a Large Hall Angle and near the Spin-Reorientation Transition. Nanomaterials 2021, 11, 854. https://doi.org/10.3390/nano11040854

AMA Style

Wang K, Zhang Y, Zhou S, Xiao G. Micron-Scale Anomalous Hall Sensors Based on FexPt1−x Thin Films with a Large Hall Angle and near the Spin-Reorientation Transition. Nanomaterials. 2021; 11(4):854. https://doi.org/10.3390/nano11040854

Chicago/Turabian Style

Wang, Kang, Yiou Zhang, Shiyu Zhou, and Gang Xiao. 2021. "Micron-Scale Anomalous Hall Sensors Based on FexPt1−x Thin Films with a Large Hall Angle and near the Spin-Reorientation Transition" Nanomaterials 11, no. 4: 854. https://doi.org/10.3390/nano11040854

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