Schematic drawing of the optical setup of the femtosecond laser scanning Kerr microscope.
Resolution tests. (a) The dynamic Kerr rotation signal of a Fe/Gd multilayer film recorded during the demagnetization process; the signal decreases within 230 fs from 90% to 10% of the signal contrast. (b) A spatial line scan of a sharp edge on a structured Co/Pt multilayer sample revealing a width of 230 nm between 90% and 10% of the signal contrast. (c) The spatial and temporal resolution is combined to record a two-dimensional image of the dynamic Kerr response from a Co/Pt dot with a diameter of 200 nm at the delay time of the maximum demagnetization.
The ultrafast demagnetization in an elliptical Co/Pt multilayer dot with a semimajor axis length of and a semiminor axis length of .
The magnetization dynamics in an Fe/Gd multilayer dot array: (a) the dynamic MOKE signal of four dots, marked with A–D in the dynamics MOKE image (7) below, within the 8 ns range; position (7) marks the first peak of the SRT-induced spin precession. (b) and (c) resolve the ultrafast demagnetization and a perpendicular standing spin wave during the remagnetization, respectively. (d) The dynamic MOKE images (1)–(8) of the four dots recorded at eight different delay times denoted by 1–8 in the graph for dot A within (a).
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