Abstract
A new surface acoustic wave (SAW) magnetic field sensor was conducted in this contribution, which was composed of a differential delay-line oscillation configuration, and a magnetostrictive FeCo film coated onto the SAW propagation path of the sensing SAW device. The FeCo coating produces magnetostrictive strain under the magnetic field, then leading to changes in the SAW propagation velocity. The corresponding differential oscillation frequency shift was used to evaluate the applied magnetic field. By theoretical analysis, the sensor response from the FeCo coated magnetic field sensor was predicted. Using the Helmholtz coil system, the developed SAW sensor was characterized, high sensitivity of 8.3 kHz/mT and good linearity were achieved from the developed 300 MHz SAW magnetic field sensor.
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