Fig. 4
From: Ultrafast optical manipulation of magnetic order in ferromagnetic materials
a Schematic representation of OSTT and IFE torques. Helicity-dependent b Mz and c My magnetization dynamics of Co (10) thin films with capping layer of 2 nm Au (black curve), 2 nm Pt (red curve), and 4 nm Pt (blue curve). d Representation of helicity-dependent Mz and My tilting at 1 ps of Co (10)/capping. e Magnetization dynamics of [Co/Pt] (or [Co/Ni])/Cu/CoFeB heterostructure. f Magnetization dynamics of [Co/Pt] (or [Co/Ni])/Cu/CoFeB heterostructure at finer timescales from − 4 to 10 ps. g Time-resolved polar magneto-optical Kerr signal of the bilayer of four configurations. h Fourier spectrum of the magnetization dynamics (left) and calculated spin waves dispersion (right). i TR-MOKE signal at ultrashort timescales. Figure a, b, c, and d are reproduced with permission from ref. [81]. Copyright (2017) the Authors. Figure e and f are reproduced with permission from ref. [92]. Copyright (2015) Springer Nature. Figure g is reproduced with permission from ref. [84]. Copyright (2014) Springer Nature. Figure h and i are reproduced with permission from ref. [85], under a Creative Commons Attribution 4.0 International License