Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.94: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Ptychographic imaging of magnetic materials at MAXYMUS X-ray microscope — •Iuliia Bykova, Markus Weigand, Kahraman Keskinbora, Umut Sanli, Joachim Gräfe, Eberhard Goering, Hermann Stoll, Gunther Richter, and Gizela Schütz — Max-Planck-Institute for Intelligent Systems, Stuttgart, Germany

The size of magnetic features in modern magnetic materials can be scaled far below 100 nm that requires imaging with advanced resolution capabilities. Ptychography is the combination of diffraction imaging and scanning transmission microscopy that provides images of extended sample areas with wavelength limited resolution. Utilizing iterative reconstruction algorithms it provides phase and amplitude information about studied specimens. With possibility to use circular negative and positive polarized X-ray light these technique would allow to gain insight into the domain configuration of the magnetic structures, their shape and stability.

MAXYMUS X-ray microscope was upgraded with a fast in-vacuum CCD camera (PNSensor) with high readout speed up to 450 Hz, quantum efficiency >70% (for E>300eV) and RMS noise per pixel less than 3e-. Implementation of a fast CCD camera and in-house produced IBL FZPs at MAXYMUS allowed introduction of ptychographic imaging and, as a result, drastic improvement of imaging resolution. We are going to present latest results of ptychographic imaging of samples with magnetic contrast obtained at MAXYMUS microscope.