Three series of L10-FePt based exchange coupled composite (ECC) films L10-FePt/Fe, L10-FePt/[Co/Ni]N and L10-FePt/[Co/Pt]N, with different magnetization configurations, on MgO substrates are studied. Though all series of samples show similar dependences of coercivity on the soft layer thickness, their thermal stabilities are much different. The perpendicular ECC film of L1 0-FePt/[Co/Ni]N shows a higher thermal stability than that of in-plane one of L10-FePt/Fe for all the soft layer thicknesses.
- Exchange coupled composite (ECC)
- thermal stability