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Sensitivity of an Anisotropic Magnetoresistance Device with Different Bias Conditions
Journal of Magnetics, Volume 6, Number 1, 31 Mar 2001, Pages 36-41
Abstract
A micromagnetic model and a single-domain model simulation programs were used to analyze the sensitivity of a 20 µm × 60 µm × 1000 Å permalloy strip as a magnetoresistance sensor with bias fields of various directions and magnitudes. The micromagnetic model agrees with the measured sensitivity data better than the single-domain model. The data show the highest peak sensitivity with the bias field at 90° to the current. The peak sensitivity decreases and the peak broadens as the bias angle decreases. The simulation using the micromagnetic model shows that a bias angle smaller than 90° leads to magnetization patterns which are free from closure domains or vertices over a wider range of bias fields.
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