From the inset of the Fig. 7a and b the film has a coercivity (Hc) of 250 and 495 Oe and a saturation magnetization (Ms) of 0.135 and 0.0046 emu/g at 5 and 100 K, respectively. This clearly shows that Fe-doped ZnO film with x = 0.20 displays ferromagnetic behavior. On the other hand, the same sample shows a diamagnetic behavior at 200 and 300 K (Fig. 7c and d).