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VIDEO DOI: https://doi.org/10.48448/rsps-e630

technical paper

MMM 2022

November 07, 2022

Minneapolis, United States

Ultrafast Lorentz Microscopy with Magnetic Field Excitation at Microwave Frequencies

With the recent progress in pulsed high-brightness photocathodes, Lorentz imaging approaches in ultrafast transmission electron microscopy (UTEM) now offer a pathway for the investigation of magnetization dynamics with nanometer spatial and femtosecond temporal resolution 1,2.
Extending the available frequencies in field-driven ultrafast Lorentz microscopy to the GHz range, we developed an in-situ radiofrequency (RF) excitation sample holder for transmission electron microscopy based on a two-dimensional microwave cavity (Fig. 1a,b). As a first test case, we investigated ferromagnetic resonances in permalloy stripe arrays (Fig. 1f) which support localized magnonic modes identified by the back-reflected RF power (Fig. 1d,g).
For ultrafast Lorentz microscopy, the RF excitation is phase-locked to the nanolocalized photoemission of ultrashort electron pulses from a Schottky field emitter, using high harmonics of an amplified laser system as a master clock for their synthetization 3. Phase-resolved ultrafast Lorentz micrographs are expected to yield high-contrast FMR mode mapping. A simulated micrograph is shown in Fig. 1c. With these developments, we aim to establish ultrafast Lorentz microscopy as a versatile lab-scale imaging tool for femtosecond and picosecond transient states in ultrafast magnetism and magnonics.


Transcript English (automatic)

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