Planar Hall effect sensor for magnetic micro- and nanobead detection

Louise Wellendorph Ejsing, Mikkel Fougt Hansen, Aric Kumaran Menon, H.A. Ferreira, D.L. Graham, P.P. Freitas

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    Abstract

    Magnetic bead sensors based on the planar Hall effect in thin films of exchange-biased permalloy have been fabricated and characterized. Typical sensitivities are 3 muV/Oe mA. The sensor response to an applied magnetic field has been measured without and with coatings of commercially available 2 mum and 250 nm magnetic beads used for bioapplications (Micromer-M and Nanomag-D, Micromod, Germany). Detection of both types of beads and single bead detection of 2 mum beads is demonstrated, i.e., the technique is feasible for magnetic biosensors. Single 2 mum beads yield 300 nV signals at 10 mA and 15 Oe applied field. (C) 2004 American Institute of Physics.
    Original languageEnglish
    JournalApplied Physics Letters
    Volume84
    Issue number23
    Pages (from-to)4729-4731
    ISSN0003-6951
    DOIs
    Publication statusPublished - 2004

    Bibliographical note

    Copyright (2004) 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.

    Keywords

    • MAGNETORESISTIVE SENSORS
    • SPIN-VALVE SENSORS
    • LABELED BIOMOLECULES

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