Data di pubblicazione
Data di priorità
Department of Physics
Paolo Vavassori, Riccardo Bertacco
A sensor is described for detecting the presence of a magnetic nanoparticle. The sensor is arranged on a support, 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, comprising a detection area 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, and a second spin configuration, wherein such domain wall is absent. The transition from the first configuration to the second configuration is affected by the proximity of a magnetic nanoparticle to the detection area.