Patent ID: 9551687
Date: 2017-01-24
CPC Classifications: B82Y,G01B,G01N,G01R,H01L,Y10T

Claim:
1. A device comprising: a sensor having a surface, the surface including a plurality of conductive layers interspersed by a plurality of intermediary layers, a magnetization direction of a first subset of the plurality of conductive layers and a magnetization direction of a second subset of the plurality of conductive layers having a ground state orientation of approximately 0 degrees, wherein the first subset is exclusive of the second subset; and a pair of electrodes coupled to the sensor surface and wherein an electrical resistance difference between the pair of electrodes is determined by a magnetic field proximate the sensor surface and wherein the sensor surface has an aspect ratio, corresponding to a length and a width of the sensor surface, that is sufficiently small such that a magnetic dipole field of a nanoparticle proximate the sensor surface is detectable as an electrical resistance difference between the pair of electrodes.