Laserpulses triple transition temperature for ferromagnetism in a rare-earth titanate nature
Representative electro-optic sampling traces and associated spectra for the three different THz excitation pulses used in the experiment. The pulse durations are approximately 360 fs at 4 THz , 205 fs at 9 THz , and 160 fs at 17 THz . Solid lines are Gaussian pulse fits used to extract nominal pulse durations. Spectra shown in the bottom panels are obtained from fast Fourier transformation of the raw time-domain data.
Comparison of the pump-induced MOKE rotation and ellipticity angles. The two curves overlap, suggesting that the signal represents pure magnetization dynamics, rather than pump-induced changes in the magneto-optical coefficient. These measurements were taken with 9 THz pump excitation at T = 10 K, and H = ±2 T, but all other pump wavelengths, temperatures, and fields show similar behavior. Normalized time-resolved MOKE signals for different phonon excitations at T = 6 K.
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