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Exchange-biased planar Hall effect sensor optimized for biosensor applications
2008
Journal of Applied Physics
This article presents experimental investigations of exchange-biased Permalloy planar Hall effect sensor crosses with a fixed active area of w ϫ w =40ϫ 40 m 2 and Permalloy thicknesses of t = 20, 30, and 50 nm. It is shown that a single domain model describes the system well and that the thicker film will have a higher signal as well as a lower noise. It is estimated that the signal-to-noise ratio for bead detection increases by a factor 2.1 when t is increased from 20 to 50 nm and hence a
doi:10.1063/1.2830008
fatcat:pjsqbyq4pbg3xf7e5ajfwnrbyq