US 7,031,186 B2 · Biosensor and sensing cell array using the same

Abstract

A biosensor and a sensing cell array using a biosensor are disclosed. Adjacent materials containing a plurality of different ingredients are analyzed to determine the ingredients based on their magnetic susceptibility or dielectric constant. A sensing cell array includes such as a magnetization pair detection sensor including a MTJ (Magnetic Tunnel Junction) or GMR (Giant Magnetoresistive) device, a magnetoresistive sensor including a MTJ device and a magnetic material (current line), a dielectric constant sensor including a sensing capacitor and a switching device, a magnetization hole detection sensor including a MTJ or GMR device, a current line, a free ferromagnetic layer and a switching device, and a giant magnetoresistive sensor including a GMR device, a switching device and a magnetic material (or forcing wordline). Ingredients of adjacent materials are separated based on electrical characteristics of ingredients by sensing magnetic susceptibility and dielectric constant depending on the sizes of the ingredients.

Claims14

Dependent claims

A biosensor, comprising:

a MTJ (Magnetic Tunnel Junction) device comprising a free ferromagnetic layer, a tunnel junction layer and a fixed ferromagnetic layer;
a switching device, formed under the fixed ferromagnetic layer of the MTJ device, for outputting current sensed in the MTJ device into a sense bitline;
and
a sense wordline, formed on the free ferromagnetic layer, for applying different bias voltages to the MTJ device,
wherein when a magnetic field of the fixed ferromagnetic layer is transmitted into the free ferromagnetic layer, the current outputted from the switching device varies according to a magnetic flux density depending on adjacent materials.

2 more elements

Dependencies are inferred from the claim text.

Biosensor and sensing cell array using the same

Life of this patent

Biosensor and sensing cell array using the same

Life of this patent

Abstract

Claims14