SQUID measurement of 4% Mn-doped Ge grown on Si, the left column is for the as-grown film and the right column is the film after 400°C annealing. (a) and (d) are the hysteresis loops at 10 and 298 K; (b) and (e) are moment versus temperature curves; (c) and (f) are Arrott’s plots. The red line in (f) shows the expected Arrott’s plot at the Curie temperature.
