Pub Date : 2024-10-31DOI: 10.1109/LMAG.2024.3490380
J. Schmidtpeter;Proloy T. Das;Y. Zabila;C. Schubert;T. Gundrum;T. Wondrak;D. Makarov
Planar Hall magnetoresistive sensors (PHMRs) are promising candidates for various magnetic sensing applications due to their high sensitivity, low power consumption, and compatibility with integrated circuit technology. However, their performance is often limited by inherent noise sources, impacting their resolution and overall sensitivity. Here the effect of three bilayer structures NiFe(10 nm)/IrMn(10 nm), NiFe(30 nm)/IrMn(10 nm), and NiFe(30 nm)/IrMn(20 nm) on noise levels is investigated at low frequency (DC-25 Hz). This study includes a detailed investigation on the optimization process and noise characteristics of multiring PHMR sensors, focusing on identifying and quantifying the dominant noise sources. The experimental measurements are complemented by a theoretical analysis of noise sources including thermal noise, 1/ f