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Controlling ultrafast magnetization dynamics by a femtosecond laser isattracting interest both in fundamental science and industry because of thepotential to achieve magnetic domain switching at ever advanced speed. Here wereport experiments illustrating the ultrastrong and fully coherent light-mattercoupling of a high-field single-cycle THz transient to the magnetization vectorin a ferromagnetic thin film. We could visualize magnetization dynamics whichoccur on a timescale of the THz laser cycle and two orders of magnitude fasterthan the natural precession response of electrons to an external magneticfield, given by the Larmor frequency. We show that for one particularscattering geometry the strong coherent optical coupling can be describedwithin the framework of a renormalized Landau Lifshitz equation. In addition tofundamentally new insights to ultrafast magnetization dynamics the coherentinteraction allows for retrieving the complex time-frequency magneticproperties and points out new opportunities in data storage technology towardssignificantly higher storage speed.

Field-driven femtosecond magnetization dynamics induced by ultrastrong coupling to THz transients