Schaffert, S.; Pfau, B.; Geilhufe, J.; Guenther, C.M.; Schneider, M.; Korff Schmising, C. von; Eisebitt, S.: High-resolution magnetic-domain imaging by Fourier transform holography at 21 nm wavelength. New Journal of Physics 15 (2013), p. 093042/1-8
10.1088/1367-2630/15/9/093042
Open Access Version
Abstract:
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.