Error correction of transformed rectangular model of concave and convex MAGFETs with AC bias

The authors derive and experimentally confirm the error correction factor, which is used to compensate for the induced current difference, according to the geometric parameters of concave and convex MAGFETs. The measurement results indicate that the highest absolute sensitivity S_A, the supply-current-related sensitivity S_RI and the supply-voltage-related sensitivity S_RV, are 88.82 mV/T, 2121.74 V/A.T and 177.65 mV/V.T, respectively, for concave MAGFETs and S_A=261.34 mV/T, S_RI=6008.26 V/A.T and S_RV=522.68 mV/V.T for convex MAGFETs with 0.5 V AC bias voltage, which is applied with high-frequency, 100 kHz, to decrease the 1/f noise. The sensitivities of convex MAGFETs are greater than those of concave MAGFETs, and the transformed model needs to be built with a low aspect ratio (L/W) and a high drain gap (d). Given a consistent geometric correction factor, the convex MAGFET with geometric parameters, L/W=40 μm/80 μm and d=2 μm, is the best choice, and the concave MAGFET with L/W=40 μm/40 μm and d=4 μm, is another good choice. Both a broadened drain gap and a small aspect ratio reduce the measured geometric correction factor (G) by increasing the magnitude of the error correction factor.