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(a) Magnetization hysteresis on Ni80Fe20 at the M2,3 Ni edge (67 eV, blue) and in the visible range at 1.96 eV (632 nm, red). (b) Ni80Fe20 reflectivity corrected for reflectivity response of the Nb mirrors of the TONIX polarimeter and (c) Kerr rotation at saturation as function of the FEL photon energy; the starred data-point corresponds to the FEL energy of the time-resolved experiments shown in Fig. 4.
