GMR multilayer sensors are enjoying success in several low magnetic field applications. The new GMR technology, spin-dependent tunneling, promises to extend low-field, solid-state sensing to areas dominated by larger, power-hungry devices.
Because of their small size, low power consumption, and relatively low cost, solid-state magnetic field sensors are moving into a growing range of new applications. Today, the new frontier for these sensors is detection of low magnetic fields.
Magnetic field sensing technology has been driven by the need for improved sensitivity, smaller size, and compatibility with electronic systems. This overview addresses the various types and applications of magnetic sensors, with particular attention to giant magnetoresistive materials."