We have a patented process that allows us to create magnetic sensors from a printed ink. The ink contains specially fabricated nanowires called giant magnetoresistance (GMR) nanowires that change their electrical resistance in a magnetic field. After fabrication, we introduce the nanowires into a solvent along with additional additives that make the ink more stable and adhere better to surfaces. The ink can be printed to create magnetic field sensors using various printing methods in the printed electronics industry.
The functionality of the sensors can be demonstrated by taking a standard resistance meter and connecting it to a printed magnetic sensor. When a magnet is moved closer and further away from the sensor the resistance on the meter changes. A resistance change of 18% is possible using a small neodymium magnet.