Patent ID: 8400146

Claim:
A bio-molecule sensing module, comprising: a stray field collector (SFC) pad which has a large active region for sensing bio-molecules, is made of a soft magnetic material or a soft ferromagnetic material of a single or multilayer structure capable of collecting a stray field, and has a shape in which a width of a side thereof is narrowed so that the stray field generated from a magnetic label on the active region is collected to amplify a magnetic flux density, and a biochip sensor which is disposed alignedly with the side of the stray field collector pad having the narrowed width, having a predetermined gap therebetween and receives the stray field collected through the side of the stray field collector pad to sense the magnetic flux density, wherein the stray field is amplified by the following mathematical equation: B stray =ƒ(μ) H stray1 N ∝ƒ(μ) H stray1 A pad / A sensor where, μ is a permeability, and ƒ(μ) is an amplification factor of the magnetic field depending on geometry and permeability of the SFC pad, N is a number of the magnetic labels on the SFC pad, H stray1 is the stray field made by a single magnetic label, A pad is an area of the SFC pad, and A sensor is an area of the biochip sensor, wherein the stray field collector pad collects and amplifies the stray field on the biochip sensor.