Because of the operating principle of the MagFET and the vectorial nature of the Lorentz force full three-dimensional simulations are mandatory and enable a deep insight of the behavior of the sensor. Two-dimensional simulations cannot be utilized. Due to the lack of appropriate simulators MAGFETs are mostly described analytically in the literature [143,147] or by measurements. Besides, three-dimensional simulation with Minimos-NT can be used to investigate the dependence of the relative sensitivity on geometric parameters.
Fig. 4.9 shows the - characteristics for both drain currents for the case that no voltage has been applied. Thus, both drain currents are equal since the sizes of the drains are equal.
In case a magnetic field is applied different drain currents are obtained. Fig. 4.10 shows the - characteristics for both drain currents in the range of . The magnetic field applied is . The figure shows a small differential current due to the low magnetic field applied. The differential current is shown in Fig. 4.11. One can clearly see that increases with increasing drain voltage.
Robert Klima 2003-02-06