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Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 25: Magnetic Imaging

MA 25.3: Vortrag

Mittwoch, 18. März 2015, 10:00–10:15, H 1012

High-Resolution Soft X-ray Holographic MicroscopeKai 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 Oepen11Institut 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).

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