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SPINTRONIC MAGNETIC NANOPARTICLE SENSORS WITH AN ACTIVE AREA LOCATED ON A MAGNETIC DOMAIN WALL

  • US 20110037463A1
  • Filed: 04/22/2009
  • Published: 02/17/2011
  • Est. Priority Date: 04/23/2008
  • Status: Active Grant
First Claim
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1. A sensor for detecting the presence of a magnetic nanoparticle (N), said sensor being arranged on a support (1), on which also a plurality of non-magnetic contacts (Iin, GND, V1, V2) is arranged, electrically conductively connected to the sensor, said contacts being adapted to be connected to means for measuring magnetoresistance on the sensor,characterized in that it includes a planar ferromagnetic structure (3), comprising a detection area (31), shaped as a strip bent to form a corner, said detection area being adapted to selectively assume, as a response to an applied magnetic field, a first spin configuration comprising a transverse “

  • head-to-head”

    domain wall (TW), and a second spin configuration, wherein such a domain wall (TW) is absent, wherein said transition from the first configuration to the second configuration is provided for an applied magnetic field, having a component which is parallel to one of the angled sides of the detection area with an intensity higher than a transition threshold (H1x);

    said transition threshold, magneto-resistively detectable, being affected by the proximity of a magnetic nanoparticle (N) to the detection area

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