Fig. 4: A complete set of tools for low-frequency magnetic spectroscopy.
From: Generation of ultrafast magnetic steps for coherent control
a, Experimental data (blue squares) and fit (blue solid line) for a magnetic step generated with our technique and the amplitude of the measured electric field of a single-cycle terahertz pulse44 (red solid line). The two signals are normalized to have the same peak value. b, Fast Fourier transform of the time domain traces in a. The experimental data relative to the magnetic step (blue squares) are shown up to 0.3 THz—above which the signal falls below the noise threshold.
