Ultrafast magnetization dynamics in thin ?lms of L10-ordered FePt and FePd compounds: Promising di?erences

摘要

In the paper we report on the synthesis, structural and magnetic characterization and timeresolved polar magnetooptical Kerr e?ect studies of thin epitaxial ?lms of the ordered L10phase 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 ?lms occurs on di?erent time scales, ～ 0.2ps and ～ 3ps, respectively. This di?erence makes these ?lms promising for arti?cial multilayer ferrimagnets with high perpendicular anisotropy suitable for all-optical fast high-capacity information storage devices.