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1. (WO2009130241) SPINTRONIC MAGNETIC NANOPARTICLE SENSORS WITH AN ACTIVE AREA LOCATED ON A MAGNETIC DOMAIN WALL

Pub. No.:    WO/2009/130241    International Application No.:    PCT/EP2009/054808
Publication Date: Oct 29, 2009 International Filing Date: Apr 22, 2009
IPC: G01R 33/12
G01N 33/543
Applicants: POLITECNICO DI MILANO
BERTACCO, Riccardo
VAVASSORI, Paolo
Inventors: BERTACCO, Riccardo
VAVASSORI, Paolo
Title: SPINTRONIC MAGNETIC NANOPARTICLE SENSORS WITH AN ACTIVE AREA LOCATED ON A MAGNETIC DOMAIN WALL
Abstract:
A sensor is described for detecting the presence of a magnetic nanoparticle (N). The sensor is arranged on a support (1), on which a plurality of non-magnetic contacts (Iin, GND, Vl, V2) electrically conductively connected to the sensor is disposed. The contacts are adapted to be connected to means for measuring magnetoresistance. The sensor includes a planar ferromagnetic nanostructure (3), comprising a detection area (31) shaped as a strip bent to form a corner. The detection area is 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 domain wall (TW) is absent. The transition from the first configuration to the second configuration is affected by the proximity of a magnetic nanoparticle (N) to the detection area.