Current pulses of up to 20 A and as short as 3 ps are generated by a low-temperature-grown GaAs photoconductive switch and guided through a coplanar waveguide, resulting in a 0.6 T subterahertz magnetic field pulse. The pulse length is directly calibrated using photocurrent autocorrelation. Magnetic excitations in Fe microstructures are studied by time-resolved Kerr spectroscopy. An ultrafast response time (within less than 10 ps of the magnetization) to the subterahertz electromagnetic field pulse is shown.
Spin dynamics triggered by subterahertz magnetic field pulses
Zhao Wang, Matthäus Pietz, Jakob Walowski, Arno Förster, Mihail I. Lepsa, Markus Münzenberg; Spin dynamics triggered by subterahertz magnetic field pulses. J. Appl. Phys. 15 June 2008; 103 (12): 123905. https://doi.org/10.1063/1.2940734
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