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Ultrafast magnetization dynamics represents a forefront area in modern spintronics and magnetic materials research, addressing the response and evolution of magnetic moments in magnetic systems over femtosecond to nanosecond timescales. To elucidate such ultrafast magnetic processes, a variety of time-resolved experimental techniques have been developed. Among them, synchrotron-based X-ray ferromagnetic resonance (XFMR) combines microwave-driven ferromagnetic resonance (FMR) with X-ray magnetic circular dichroism (XMCD) detection, enabling element-, valence-, and lattice space- resolved measurements of magnetization precession on the picosecond timescale and providing direct access to both the amplitude and phase of the dynamic magnetic moment. This work developed a picosecond time-resolved XFMR platform at the BL07U vector magnet beamline of the Shanghai Synchrotron Radiation Facility (SSRF). The system employs a lock-in modulation detection scheme precisely synchronized with the storage-ring master clock, realizing stable excitation and detection of spin precession in magnetic materials up to 6 GHz, with the background noise effectively suppressed to 30 fA, and an overall phase time resolution better than 10 ps. The successful implementation of this technique establishes a state-of-the-art XFMR capability in China, achieving internationally competitive performance in both temporal resolution and detection sensitivity. This development provides a powerful experimental foundation for future investigations of spin current and orbital current detection, as well as ferrimagnetic and antiferromagnetic dynamics.
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Keywords:
- Ultrafast magnetism dynamics /
- Synchrotron radiation /
- X-ray ferromagnetic resonance /
- Phase-time resolution
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