Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 27: Ultrafast Magnetization Effects I
MA 27.4: Talk
Wednesday, March 11, 2026, 10:30–10:45, HSZ/0004
Exploitation of Spin Wave Resonances in Miniaturized Magnetic Electron Optics for Ultrafast Electron Beam Manipulation — •Max Herzog1, Johannes Schultz1, and Axel Lubk1,2 — 1IFF, IFW Dresden, Helmholtzstraße 20, 01069 Dresden — 2IFMP, TU Dresden, Haeckelstraße 3, 01069 Dresden
Magnetic electron optics that can be switched on sub-nanosecond time scales are useful for the setup of stroboscopic measurements in scanning and transmission electron microscopes. Scaling laws indicate that devices become permeable for alternating magnetic fields with GHz frequency by miniaturizing them to micrometer length scales, therefore decreasing their induction. On these length scales, spin waves can be excited in the magnetic pole pieces which can drastically increase the micro optics effectivity when their resonance condition is met. We fabricate such magnetic multipole optics using lithographic techniques with pole piece sizes in the tens of µm, a thickness of up to 800 nm, a pole piece distance of 25 µm as well as variable geometries in order to optimize the resonant behavior. Due to those resonances, the characterized micro optics show an especially strong deflection of the TEMs 300 keV electron beam of more than 100 µrad at 3 GHz excitation frequency. Conducted electron spin resonance measurements confirm the possibility to excite spin waves in the magnetic pole pieces in the same frequency range. This allows for the application of models of the dispersion relation to determine favorable values for parameters like thickness, exchange interaction, and saturation magnetization in order to achieve the desired resonance frequency.
Keywords: Ultrafast Transmission Electron Microscopy; Spin Waves; Scanning Electron Microscopy; Micro Electromechanical Systems; Electron Spin Resonance