Fig. 1: Time-resolved MOKE signal of Co/Pt bilayer.
From: Laser-induced coherent spin change due to spin-orbit coupling
a Dynamic Kerr rotation \(\Delta {{\rm{\theta }}}_{{\rm{Kerr}}}\) induced by a circularly polarized 800-nm pump pulse (~4.5 mJ/cm2) and measured with a linearly polarized 725-nm probe pulse. b Magnetization-dependent \(\Delta {{\rm{\theta }}}_{{\rm{Kerr}}}\) [= \(({\sigma }_{-}{M}_{+}+{\sigma }_{+}{M}_{+}-{\sigma }_{-}{M}_{-}-{\sigma }_{+}{M}_{-})/4\)] and helicity-dependent \(\Delta {{\rm{\theta }}}_{{\rm{Kerr}}}\)[= \(({\sigma }_{-}{M}_{+}-{\sigma }_{+}{M}_{+}+{\sigma }_{-}{M}_{-}-{\sigma }_{+}{M}_{-})/4\)] from the results of a. c Magnetization-dependent \(\Delta {{\rm{\theta }}}_{{\rm{Kerr}}}\) normalized by static Kerr rotation \({{\rm{\theta }}}_{{\rm{Static}}}\) and normalized reflectance \(\Delta {\rm{R}}/{\rm{R}}\). A black (red) down arrow indicates a transient peak signal of \(\Delta {{\rm{\theta }}}_{{\rm{Kerr}}}/{{\rm{\theta }}}_{{\rm{Static}}}\) (\(\Delta {\rm{R}}/{\rm{R}}\)). d Normalized magnetization-dependent \(\Delta {{\rm{\theta }}}_{{\rm{Kerr}}}/{{\rm{\theta }}}_{{\rm{Static}}}\) measured with various probe wavelengths.
