Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Magnetic Imaging

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-Harris31Universität 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) [1] 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 [2]. 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 [3] 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.

[1] S. Eisebitt, et al., Nature 432, 885 (2004).

[2] D. Stickler, et al., Appl. Phys. Lett. 96, 042501 (2010).

[3] D. Zhu, et al., Phys. Rev. Lett. 105, 043901 (2010).

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