Hall measurements were conducted in two Quantum Design physical property measurement systems. A Keithley 6221 current source was used to generate alternating currents and pulsed direct currents, and two SR830 lock-in amplifiers and an SR560 preamplifier were used to measure the Hall voltage of the Hall bars. The alternating current with a root mean square amplitude of 0.05 mA was used to measure the Hall responses. The pulsed direct currents for switching measurements had an amplitude of 1 mA and a time duration of 5 ms. To eliminate the effect of Joule heating, each data point was taken after pausing for 60 to 180 s after a direct current pulse was applied.

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