Domain structure movement in L10 FePt islands observed by in situ MFM

Abstract Domain structure movement in L1 0 FePt films with nominal thickness t N =45 and 50 nm were observed by magnetic force microscope (MFM). The coercivity H c changes by one order of magnitude with the morphology change from a separated island structure at H c =45 nm to a continuous network structure at t N =50 nm. A nucleation-type reversal was shown in the islands, while a domain wall movement in initial process was observed in the continuous networks.