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High-resolution magnetic-domain imaging by Fourier transform holography at 21 nm wavelength

Schaffert, Stefan; Pfau, Bastian; Geilhufe, Jan; Günther, Christian M.; Schneider, Michael; Korff Schmising, Clemens von; Eisebitt, Stefan

FG Röntgenoptik und Nanometer-Optik

Exploiting x-ray magnetic circular dichroism at the L-edges of 3d transition metals, Fourier transform holography has become a standard technique to investigate magnetic samples with sub-100 nm spatial resolution. Here, magnetic imaging in the 21 nm wavelength regime using M-edge circular dichroism is demonstrated. Ultrafast pulses in this wavelength regime are increasingly available from both laser- and accelerator-driven soft x-ray sources. We explain the adaptations concerning sample preparation and data evaluation compared to conventional holography in the 1 nm wavelength range. We find the correction of the Fourier transform hologram to in-plane Fourier components to be critical for high-quality reconstruction and demonstrate 70 nm spatial resolution in magnetization imaging with this approach.