5.2 Analysis at 300 K

The relative sensitivity of the three-drain MAGFET differs from the two-drain MAGFET. In the later the differential current comes from the fact that only two drain currents exist. In the case of a three-drain MAGFET, at least three differential currents can be defined. The central drain is used as a reference current and the differential current will be taken between the lateral drains. If the three drains are labeled as D1, D2 and D3, being D2 the central drain, then the relative sensitivity of a three-drain MAGFET is defined as follows:

$$S_r = \frac{\vert I_{D1}-I_{D3}\vert}{(I^0_{D1}+I^0_{D2}+I^0_{D3})\vert\mathbf{B}\vert}$$ (5.1)

where $I_{D1}$ and $I_{D3}$ are the currents at Drain 1 and Drain 3 when the magnetic field is applied, $I^0_{D1}$, $I^0_{D2}$, and $I^0_{D3}$ are the drain currents when the magnetic field is not applied, and $\mathbf{B}$ is the magnetic field.