Sensors spintronic magnetic nanoparticles with an active area located in a magnetic domain wall

摘要

A sensor detecting the presence of magnetic nanoparticle, said sensor comprising: a support (1) on which the sensor is disposed; a plurality of non-magnetic contacts (Iin, GND, V1, V2) arranged on the carrier and electrically and conductively connected to the sensor; the means of measuring the magnetoresistance of the sensor connected to said plurality of non-magnetic contacts, characterized in that: - the sensor includes a planar ferromagnetic structure (3) comprising a sensing area (31), formed as a strip bent to form a corner, - the sensor is structured to apply a magnetic field to cause the detection area selectively assume, as a response to applied magnetic field: a first spin configuration comprising a domain wall (TW) " head-to-head ", and a second spin configuration, wherein said domain wall (TW) is absent, wherein said transition between the first configuration and the second configuration is provided by the applied magnetic field, which has a component which is parallel to one side of the angle detection area with a higher transition threshold predictable (H1x) intensity; It said transition threshold, detectable by I being magnetoresistance affected by the proximity of a magnetic nanoparticle (N) to the sensing area. - said measurement means is structured to provide a measure of said transition threshold by magnetoresistance measurements detection area in said first and second spin configurations assumed upon application of said magnetic field.