Solid-State Magnetic Sensors for Bioapplications



During the last decade, intensive research efforts have been expended to develop solid-state magnetic sensors for applications such as biomolecular sensing and single molecule detection. This chapter reviews sensors proposed thus far, including (a) GMR and spin valve sensors based on the giant magnetoresistance (GMR) effect; (b) magnetic tunnel junction (MTJ) sensors based on tunneling magnetoresistance (TMR); (c) anisotropic magnetoresistance (AMR) ring sensors and planar Hall effect sensors based on the AMR effect; (d) Hall sensors based on the classical Hall effect; and (e) giant magnetoimpedance (GMI) sensors based on the frequency-dependent variation of the skin depth in magnetic wires with field. Two different types of sensors are highlighted: the ones with large sensing areas (hundreds of μm2) intended to provide statistical counting of a large number of magnetic micro- or nanoparticles and the others with micro- or submicrometer-sized sensing areas that focus on single particle detection.


Hall Sensor Magnetic Tunnel Junction Single Molecule Detection Magnetic Label Stray Magnetic Field 
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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Materials Science DivisionArgonne National LaboratoryArgonneUSA
  2. 2.MARTECH and Department of PhysicsFlorida State UniversityTallahasseeUSA

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