Berlin 2012 – wissenschaftliches Programm
MA 31.2: Vortrag
Mittwoch, 28. März 2012, 15:15–15:30, BH 243
Pushing the spatial resolution of X-ray holographic microscopy below 20nm — •Judith Bach1, Robert Frömter1, Daniel Stickler1, Matthias Hille1, Hans Peter Oepen1, Leonard Müller2, Christian Gutt2, Gerhard Grübel2, Carsten Tieg3, and Flora Yakhou-Harris3 — 1Universität Hamburg, Germany — 2DESY, Hamburg, Germany — 3ESRF, Grenoble, France
Imaging techniques are one of the most direct and intuitive accesses to investigate the magnetic behavior of ferromagnets. On the nanoscale, soft X-ray Fourier-Transform Holography(FTH)  is a powerful lensless method that provides element specificity and fast image reconstruction. As one of many improvements over the last years, a new microscope setup was developed extending the method’s applicabilty to a broader variety of samples . We present experimental results on resolution achieved at the ID 08 soft X-ray beamline of the ESRF. The results demonstrate a significant improvement of the spatial resolution down to 18 nm. To a large part this was achieved by a smaller sample-camera distance, thus increasing the acceptance in q-space. An additional contribution comes from using so-called HERALDO  masks. In contrast to standard FTH masks with circular reference holes, they contain reference slits. We report on the first application of HERALDO to magnetic imaging and compare it to standard FTH.
 S. Eisebitt, et al., Nature 432, 885 (2004).
 D. Stickler, et al., Appl. Phys. Lett. 96, 042501 (2010).
 D. Zhu, et al., Phys. Rev. Lett. 105, 043901 (2010).