Exchange-biased planar Hall effect sensor optimized for biosensor applications

Christian Danvad Damsgaard, S.C. Freitas, P.P. Freitas, Mikkel Fougt Hansen

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    This article presents experimental investigations of exchange-biased Permalloy planar Hall effect sensor crosses with a fixed active area of w x w = 40 x 40 mu 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 higher t is beneficial for biosensor applications. This is exemplified with calculations on M-280 Dynabeads (R).
    Original languageEnglish
    JournalJournal of Applied Physics
    Issue number7
    Pages (from-to)07A302
    Publication statusPublished - 2008

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    Copyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.


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