A vector network analyzer is used to measure the RF absorption and to detect the magnon resonance. It also serves as the source for the high-frequency continuous wave (CW) signal with a frequency f = 1.98 GHz to excite the magnon resonantly. The magnon resonance frequency is tuned to the excitation frequency f via a static magnetic field Hext. The static magnetic field aligns the static magnetization along the stripline’s long axis, which coincides with the k-vector of the incoming x-rays. The dynamic magnetic Oersted field of the stripline is thus perpendicular to the static magnetization and excites the ferromagnetic mode (k = 0) of magnons directly above the stripline. To perform timing experiments, a pulse generator with variable pulse duration and delay time Δtp is triggered by the bunch clock of the synchrotron at a frequency of 5.2 MHz. The CW signal and the pulses are multiplied in a mixer and subsequently amplified. Samples are contacted by RF probes. The stripline generates a magnetic Oersted field in the permalloy film with the same time structure as the electrical current (13). The resulting magnetic field burst is resonant to the ferromagnetic magnon in the permalloy film. The time delay Δtp between the x-ray pulse and the burst can be set freely within the x-ray bunch repetition period of the synchrotron of 192 ns.

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