Simulation of the SAW sensor measuring magnetic fields using the transmission matrix model combined with FEM simulations

Abstract

This study proposes the transmission matrix model [ABCD] for the FeNi magnetic sensitive layer used in surface acoustic wave magnetic (SAW-MO) sensors. The center frequency and input excitation to the sensor through the v_m-H characteristic are determined by finite element simulation (FEM) on the FeNi/IDT/ST-Quartz structure. The simulation results of the center frequency and sensor's working response show that simulations by the FEM method and simulations by the transmission matrix (TM) method are correlated. Furthermore, the survey also indicates the more reasonable and suitable of the third-order v_m-H characteristic curve compared to the second-order characteristic in the transmission matrix model of the FeNi magnetic sensitivity layer. These accuracy and suitability are expressed through the trend and shape of the sensor's working response.