Research on Magnetic Field Feedback Compensation System based on Highly Sensitive TMR-Superconducting Composite Magnetic Sensor

Magnetoresistance-superconductor composite magnetic sensors, as high-sensitivity detectors for weak magnetic fields, have significant application potential in fields such as magnetocardiography, magnetoencephalography, and high-precision nondestructive testing. However, with the continuous improvement in the magnetic field resolution of magnetoresistance-superconductor composite magnetic sensors, their detection range is progressively shrinking, which makes it difficult to meet the required measurement range for magnetic fields. This paper addresses this issue by proposing a magnetic field feedback compensation system based on magnetoresistance-superconductor composite magnetic sensors, aimed at satisfying the sensor’s high sensitivity and wide measurement range requirements. Theoretical and experimental results fully verify that the feedback compensation system can greatly improve the range of TMR-superconducting composite devices on the basis of ensuring their sensitivity. The work in this paper will be helpful to the research and practical application in highly sensitive magnetoresistance sensor.