Design Development of the Ultra-Sensitive Sensor of a Brain Magnetic Field Based on the Magnetic Tunnel Junctions and Magnetic Concentrators

In this work, we investigate electrical characteristics of magnetic tunnel junctions with the uniaxial anisotropy in the free layer and the pinned free layer by antiferromagnetic layer. Both constructions have linear hysteresis and are suitable for use in sensor design for brain’s magnetic field detection. Additionally, we provide calculations for magnetic flux guides of triangle-shape and trapezoid-shape and their efficiency for sensor sensitivity enhancement.