Nuclear resonant scattering has been performed at the Dynamics beamline P01 at the synchrotron radiation source PETRA III, DESY, Hamburg. The energy of the x-rays is tuned to the 14.4-keV resonance of 57Fe. The nuclei’s number density is 1.8 × 1028 m−3 and such that a nuclear exciton is formed when the 14.4-keV nuclear resonance of the isotope is excited by an x-ray pulse from the synchrotron. Measurements are performed in Faraday geometry, where the x-ray wave vector is parallel to the static in-plane magnetization of the film set by the external magnetic field. The x-rays are monochromatized by a high-heat load monochromator and a high-resolution monochromator to a bandwidth of about 1 meV. Two Kirkpatrick-Baez mirrors focus the x-rays down to a spot size of 10 μm × 5.7 μm (horizontal × vertical) on the stripline. Measurements are performed in grazing incidence at the critical angle of the trilayer at 0.27°, resulting in a length of the x-ray footprint of 1.2 mm on the sample. The synchrotron was operated in 40 bunch mode with an x-ray repetition rate of 5.2 MHz. A time-gated avalanche photo diode (APD) counts the delayed single photons from the nuclear de-excitation in a time-resolved manner to measure the nuclear quantum beat. The measured intensity shown is the number of counts per time interval divided by the total counts per quantum beat pattern. The measurements start 10 ns after nuclear excitation due to the electronic downtime of the detector after the prompt pulse.

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