Abstract
In recent years, the importance of understanding dynamic properties of magnetic materials is increasing. For designing dynamic responses in ultrafast optical control applications to spintronic devices, clarifying intra- and inter-layer energy dissipation process and spin dynamics in multilayered systems is an important issue. In this study, we investigated layer-specific measurement of ultrashort laser-induced ultrafast demagnetization and precession in magnetically and electrically decoupled GdFeCo double-layered film by all-optical pump-probe method. After laser excitation, demagnetization level of the first magnetic layer located at pump light incident side is about 5 times as large as another layer within ～ps range. Furthermore, from a time evolution of Faraday rotation in recovering processes, it is found that lattice temperature of each magnetic layer equilibrates at ～400 ps. Finally, independent precessional oscillation of each magnetic layer is clearly observed.
