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

Published in: Sensors (Basel, Switzerland) (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.

Keyphrases

air pollution
molecularly imprinted
low cost
metal organic framework
room temperature
mass spectrometry
ionic liquid