FORC-study of magnetization reversal of L1₀-FePt based exchange coupled composite films

Perpendicular exchange coupled composite structures were prepared, utilizing L1₀-FePt as hard layer and [Co/Ni]_N multilayer as soft layer. Magnetic characteristics revealed the gradually change of the magnetization reversal mechanism from incoherent rotational mode to dominant wall motion as the thickness of soft layer increases. Furthermore, FORC analysis were employed to characterize the interactions of our ECC magnetic system, the result indicates that the exchange coupling interaction were enhanced with the increasing thickness of soft layer.