Planar Hall effect sensor for magnetic micro- and nanobead detection

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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
Issue number23
Pages (from-to)4729-4731
Publication statusPublished - 2004

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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.

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