Measure ultra low magnetic fields using GMR spin-valves in combination with magnetic sweeping field with and without locking technique.
Original Publication Date: 2004-Sep-30
Included in the Prior Art Database: 2004-Sep-30
This invention combines a GMR-Spin valve bridge with a sweeping coil, made by thin film technique, and an electronic circuit to build a miniaturized high sensitive magnetic sensor. A sensitivity of 10µV/V/µT without flux guides and 200µV/V/µT with flux guides at a measurement range of 10000 µT and a signal to noise ration up to 0.02 µT is possible. This performance reaches the performance of flux gates however the device is very small. If the thin film technique is combined with semiconductor processes the integration level will be extremely high and a very small device with very high sensitivity to magnetic fields is available.