Fig. 3. Characterization of the 9 THz pumped non-equilibrium state.
a, Time-resolved MOKE signal for different magnetic fields at T = 5 K. b, Extracted maximum non-equilibrium magnetization (at t > 100 ps) (blue circles), compared to the equilibrium magnetization (grey solid line). The light-enhanced magnetic state nearly reaches the ideal spin-half limit (dotted line) suggesting a suppression of spin fluctuations. The inset shows the fluence dependence of the maximum pump-induced ΔφM, which saturates at high fluence just below the limit. c, Temperature dependence of the non-equilibrium magnetization (blue circles). The light-induced effect extends up to at least 80 K, well above the equilibrium case (grey solid line). d, Maximum pump-induced MOKE signal as a function of magnetic field at T = 60 K. The field dependence follows that of equilibrium YTiO3 below Tc, indicating the stabilization of a high-temperature ferromagnetic state. Error bars in b–d represent propagated uncertainty in M, as detailed in the Methods.