Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Magnetic Imaging and Sensors I

MA 18.12: Vortrag

Dienstag, 19. März 2024, 12:30–12:45, EB 301

Ultrafast soft X-ray magnetic holography at SwissFEL — Boris Sorokin, Andre Al Haddad, Kirsten Schnorr, Joerg Raabe, and •Simone Finizio — Paul Scherrer Institut, Villigen PSI, Switzerland

X-ray imaging at synchrotrons have enabled a significant advancement in the understanding of the physics driving magnetic systems. Nevertheless, for X-ray imaging at ultrafast timescales, free-electron lasers become a necessity. In this presentation, an overview of the first results of the magnetic imaging setup recently commissioned at the Maloja endstation of the soft X-ray Athos beamline at SwissFEL (PSI, Switzerland), which is based on X-ray holography, will be given. This is a lensless imaging technique that allows the retrieval of both amplitude and phase information of the sample transmission function. Since X-ray holography is an intrinsically drift free technique and a full-field microscopy technique, it is well suited for free-electron lasers, where shot-to-shot variations render scanning microscopy techniques unbefitting. Athos beamline of SwissFEL, with its 16 Apple-X undulators, provides soft X-ray radiation with a fully controllable polarisation. This makes it particularly suitable for ultrafast X-ray magnetic imaging, where XMCD and XLD are employed as contrast mechanisms for both ferromagnetic and antiferromagnetic samples, respectively. During the commissioning phase, we demonstrated the possibility of measuring the static images of the labyrinth magnetic domain structures in thin films with perpendicular magnetic anisotropy. This is the first step towards ultrafast time-resolved soft X-ray magnetic imaging.

Keywords: X-ray holography; Ultrafast magnetization dynamics; Free-electron-laser