A high-sensitivity magnetoresistive sensor

A magnetic sensor technology that addresses both higher sensitivity and lower power is described. The sensor is based on the magnetoresistive effect exhibited in a thin film of ferromagnetic material. The basics of the magnetoresistive transducer and the concept, design, fabrication, and characterization of a single-axis, thin-film magnetometer are presented. Minimum sensor noise is balanced with minimum sensor power dissipation to provide a sensor with a minimum noise of 2 mu G/ square root Hz at a power dissipation of 800 mu W. A discussion of the use of this sensor in magnetic anomaly detection applications is also included. The improvements in increased sensitivity and lower power of this magnetoresistance sensor technology open new possibilities for magnetic anomaly detection applications. The goal is to develop a system that maximizes the capability of the sensor and minimizes compromises due to background noise.<>