Figure 1

Polarimetric detection scheme based on the rotating analyzer ellipsometer.Reuse & Permissions

Figure 2

Probe intensity ($\lambda =710\mathrm{n}\mathrm{m}$) as a function of the analyzer angle $\alpha$ in the Faraday (a) and Kerr (c) configurations. The open and filled symbols correspond to two opposite remnant magnetizations. The continuous lines are the fits according to Eq. (1). The spectral dependences of the static Faraday (b) and Kerr (d) MO angles $\theta$ and $\eta$ are obtained with the same fitting procedure for each wavelength. For comparison we report the ellipticity and rotation measured with the photoelastic modulator technique at $\lambda =790\mathrm{n}\mathrm{m}$ [9].Reuse & Permissions

Figure 3

(a) $R(\alpha )$ as defined in Eq. (2) for different delays $\tau$. For clarity in (b) we show $R(\tau <0)-R(\tau )$.Reuse & Permissions

Figure 4

Probe intensity as a function of the analyzer angle $\alpha$ in the Faraday (a) and Kerr (b) configurations (same condition as in Fig. 3). The filled squares (circles) correspond to a $+M$ ($-M$) remnant magnetization measured for a negative delay (static contribution). Open symbols: $\tau =+600\mathrm{f}\mathrm{s}$. Continuous and dotted lines: cumulative fit of the four parabolas with Eq. (1). In these fits ${\theta }_0$, ${\eta }_0$ are blocked, $I_0$ evolves according to the differential transmission (or reflectivity) data, and ${\theta }_M$, and ${\eta }_M$ parameters are constraints such that $\frac{\Delta {\theta }_M}{{\theta }_M}(\tau )\equiv \frac{\Delta {\eta }_M}{{\eta }_M}(\tau )$. (c) Corresponding time evolution of the rotations $\Theta$ (Kerr and Faraday geometries).Reuse & Permissions

Figure 5

Relative variations of the rotation $\Delta \Theta /\Theta$ measured at 530 nm (squares) and 620 nm (circles) in the Kerr (empty symbols) and Faraday (filled symbols) configurations.Reuse & Permissions