Figure 4.

Dynamic hysteresis in the magnetoresistance measured at base temperature. Figure 4a shows the hysteresis in the magnetoresistance of the aluminium contacted Hall bar as a function of magnetic field sweep rate. At a fast sweep rate of 0.2 T/min clear hysteresis is observable, but disappears for sweep rates of 0.1 T/min or lower. Figure 4b shows the same results from a nickel silicide contacted Hall bar. We see comparable behaviour, indicating that the nickel silicidation process does not exacerbate the hysteresis.