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Open AccessArticle

Low-Frequency Noise of Magnetic Sensors Based on the Anomalous Hall Effect in Fe–Pt Alloys

Department of Physics, Brown University, Providence, RI 02912, USA
Author to whom correspondence should be addressed.
Sensors 2019, 19(16), 3537;
Received: 22 July 2019 / Revised: 9 August 2019 / Accepted: 11 August 2019 / Published: 13 August 2019
(This article belongs to the Special Issue Magnetic Sensing Technology, Materials and Applications)
PDF [2806 KB, uploaded 13 August 2019]


We took advantage of the large anomalous Hall effect (AHE) in Fe–Pt ferromagnetic alloys and fabricated magnetic sensors for low-frequency applications. We characterized the low-frequency electronic noise and the field detectability of the FexPt100-x system with various thin film thicknesses and Fe concentrations. The noise source consisted of 1/f and Johnson noise. A large current density increased the 1/f noise but not the Johnson noise. We found that the field detectability of the optimized Fe–Pt thin film offers much better low-frequency performance than a highly sensitive commercial semiconductor Hall sensor. Anomalous Hall effect sensors are, therefore, good candidates for magnetic sensing applications. View Full-Text
Keywords: anomalous Hall effect; noise measurement; Fe–Pt alloy anomalous Hall effect; noise measurement; Fe–Pt alloy

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Zhang, Y.; Hao, Q.; Xiao, G. Low-Frequency Noise of Magnetic Sensors Based on the Anomalous Hall Effect in Fe–Pt Alloys. Sensors 2019, 19, 3537.

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