Schaffert, StefanPfau, BastianGeilhufe, JanGünther, Christian M.Schneider, MichaelKorff Schmising, Clemens vonEisebitt, Stefan2022-02-152022-02-152013-09-27https://depositonce.tu-berlin.de/handle/11303/16397http://dx.doi.org/10.14279/depositonce-15173Exploiting 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.en530 PhysikFourier transform holographymagnetic-domain imaging3d transition metalsx-ray magnetic circular dichroismmagnetic imagingArticle2022-02-101367-2630