MAGNETIC SENSOR AND BIOMAGNETISM MEASUREMENT SYSTEM

摘要

The invention uses tunneling magnetoresistive elements as sensor devices for detecting biomagnetic signals and offsets external magnetic fields, etc. outside of the detection subject by means of multiple tunneling magnetoresistive elements. The invention is a magnetic sensor in which multiple assemblies are combined, the assemblies comprising tunneling magnetoresistive elements (10) that change the current flowing from a fixed magnetic layer to a free magnetic layer according to the angle between the orientation of the magnetization of the fixed magnetic layer and the orientation of the free magnetic layer magnetization. The assemblies are configured from: multiple tunneling magnetoresistive elements that are connected in series in an arrangement wherein the respective orientations of the fixed magnetic layer magnetizations and of the free magnetic layer magnetizations without an applied magnetic field coincide; a capacitor connected in parallel to the multiple tunneling magnetoresistive elements; and a fixed resistor connected in series to the multiple tunneling magnetoresistive elements and the capacitor. The magnetic sensor is configured by disposing the multiple assemblies with the orientations of the fixed magnetic layer magnetizations thereof being reversed with respect to each other with relative angles exceeding 90° and connecting same in series and/or in parallel.