It is well known that the mobility is always determined through standard Hall effect detection. For an ordinary Hall effect, that is easy to extract the hall coefficient. However, if the system shows anomalous hall effect, the Hall resistance trace generally contains two parts of lines in low field and high field. The line in low field contains the anomalous hall contribution and the high field part just shows the ordinary hall contribution. So in this case, which part should be used to calculate the mobility without field?