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MA: Fachverband Magnetismus
MA 25: Magnetic Imaging
MA 25.3: Talk
Wednesday, March 18, 2015, 10:00–10:15, H 1012
High-Resolution Soft X-ray Holographic Microscope — Kai Bagschik1, Judith Bach1, Robert Frömter1, •Jochen Wagner1, Leonhard Müller2, Stefan Schleitzer2, Jens Viefhaus2, Christian Weier3, Roman Adam3, Gerhard Grübel2, Claus M. Schneider3, and Hans Peter Oepen1 — 1Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg, Germany — 2DESY, Hamburg, Germany — 3Peter Grünberg Institut, Forschungszentrum Jülich, Germany
X-ray Fourier transform holography has become a competitive technique to investigate magnetic samples with sub-20 nm spatial resolution exploiting the x-ray magnetic circular dichroism [1]. The obtainable resolution depends on the maximum recorded scattering angle and the size of the reference hole of the optics mask.
Our X-ray holographic microscope, equipped with a large-area CCD camera of 4k × 4k pixels, accepts scattering angle of up to 10∘. This corresponds to a maximum q = 0.66 nm−1 for the L-edge of Cobalt (778 eV). Separated sample and optic mask allow a free movement across the sample [1]. A permanent-magnet assembly enables application of in- and out-of-plane magnetic fields of up to 140 mT [2].
We imaged the domain pattern of Co/Pt and Fe/Pd multilayer films and determined a spatial resolution of (16 ± 1) nm. With this resolution, we could successfully image Co/Pt nanodots with diameters between 30 - 100 nm.
[1] D. Stickler, et al., Appl. Phys. Lett. 96, 042501 (2010). [2] D. Nolle, et al., Rev. Sci. Instrum. 83, 046112 (2012).