An accurate model of a highly ordered 81/19 Permalloy AMR Wheatstone bridge sensor against a 48 pole pair ring-magnet
by Michael J. Haji-Sheikh, Young Yoo
International Journal of Intelligent Systems Technologies and Applications (IJISTA), Vol. 3, No. 1/2, 2007

Abstract: Presented is a method to model a magnetoresistive Wheatstone bridge using a new magnetoresistive model for resistor elements in saturation. The model works well with highly ordered thin films such as Permalloy. This new model accurately predicts the behaviour of individual magnetoresistors and follows the form ΔR/R₀ = A + B((1 + C × cos(2θ)²) + C × sin(2θ)²)^1/2. To demonstrate the use of this model, a 17.5 nm thick Permalloy sensor bridge was used to sense a 48 pole pair ring-magnet. The results show a good correlation between the model and an actual device under test.

Online publication date: Fri, 22-Jun-2007

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