Search

Clarifying the relation between All-Optical magnetization switching (AOS) [1] and the non-local energy dissipation process, we focus on the contribution from energy dissipation process on depth direction. For this purpose, we research the differently designed structure dependency of created magnetic domain. Its dependency is observed from the reversal phenomena, AOS or the multi-domains by Thermo-Magnetic Nucleation (TMN) in GdFeCo multi-layer thin films. We obserbed these phenomena that is excited by a femtosecond laser pulse on the multilayer: following the stack design hereafter: SiN (60 nm) / $\text{Gd}_{x}(\text{Fe}_{87.5}\text{Co}_{12.5})_{100-x}(l)$ / SiN (m) / AITi (n) / glass sub., (where x is the Gd atomic percent and the {l, m, n} indexes are the thickness in nm of the respective layer (l = 10 ~30 nm, $m$ = 5 or 0 nm, $n$ = 10 or 0 nm) with a polarizing microscope. And $l$ is designed around penetration depth.