Ultrafast magnetization dynamics in thin films of L10-ordered FePt and FePd compounds: Promising differences

© Kazan Federal University (KFU). In the paper we report on the synthesis, structural and magnetic characterization and time-resolved polar magnetooptical Kerr effect studies of thin epitaxial films of the ordered L10-phase of FePt and FePd compounds. Time scales of the photoinduced demagnetization and magnetization recovery are found. It is shown that demagnetization of FePt and FePd films occurs on different time scales, ~ 0.2 ps and ~ 3ps, respectively. This difference makes these films promising for artificial multilayer ferrimagnets with high perpendicular anisotropy suitable for all-optical fast high-capacity information storage devices.