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Low-Frequency Noise of Magnetic Sensors Based on the Anomalous Hall Effect in Fe-Pt Alloys
Yiou Zhang1, Qiang Hao1, Gang Xiao2
1Department of Physics, Brown University, Providence, RI 02912, USA.
Abstract:
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.
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