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Some of the major contributions to noise in magnetic sensors can only be reduced by increasing the size of the sensor. Here we present an approach for reducing 1/f noise in large magnetic sensors. The approach is based on modulating the field by rotating a disc containing permalloy flux concentrators or flux guides. The disc rotation is driven by an air turbine. Modulation frequencies as high as 76...
Magnetic flux concentrators are soft magnetic materials typically used to focus magnetic field lines in an effort to increase the sensitivity of a magnetic sensor. The use of magnetoresistive sensors, especially given the recent development of magnetic tunnel junctions (MTJ) with MgO barriers exhibiting magnetoresistance (MR) values as large as 400%, has created interest in flux concentrators as an...
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