Jan Geilhufe, Adam F. Leontowich, Russ Berg, Chris Regier, Darwin Taylor, Jian Wang, John Swirsky, Chithra Karunakaran, Robert Peters, Mirwais Aktary, Adam Hitchcock, Stephen Urquhart
A new scanning transmission X-ray microscope (STXM) optimized for cryo-spectro-tomography with soft X-rays has been designed, built and commissioned at Canadian Light Source (CLS) beamline 10ID1 (130-2700 eV). It is controlled via a new python-based software package, pySTXM. A liquid N2 goniometer (Gatan 630, -80° to 80°), mounted on a computer controlled (x,y,Theta) tilt stage allows for spectro-tomographic measurements at cryogenic temperatures (-180°C) which reduces radiation damage. The CLS cryo-STXM is unique among the set of soft X-ray STXMs currently installed around the world. Details of the cryo-STXM design and examples of its performance will be presented.
Christoforos Moutafis, Felix Büttner, Andre Bisig, Benjamin Krüger, C. A. Vaz, Michael Foerster, Mohamad-Assaad Mawass, Michael Schneider, Christian Gunther, Jan Geilhufe, C. von Korff Schmising, J. Mohanty, B. Pfau, Stefan Schaffert, Tomek Schulz, Markus Weigand, Henk Swagten, Jörg Raabe, Mathias Kläui, Stefan Eisebitt
Skyrmions are topologically protected particle-like configurations, with a topological
complexity described by their Skyrmion number. In magnetic systems, they have been
numerically predicted to exhibit rich dynamics, such as the gyrotropic and breathing
modes, dominated by their topology. Recent experimental advances brought their static
manipulation well under control. However, their dynamical behaviour is largely
unexplored experimentally. In this work, we provide with the first direct observation of
eigenmode skyrmion dynamics. In particular, we present dynamical imaging data with
high temporal and spatial resolution to demonstrate the GHz gyrotropic mode of a
single skyrmion bubble, as well as the breathing-like behaviour of a pair of skyrmionic
configurations. We use the observed dynamical behaviour to confirm the skyrmion
topology and show the existence of an unexpectedly large inertia that is key for
accurately describing skyrmion dynamics. Our results demonstrate new ways for
experimentally observing skyrmion dynamics and provide a framework for describing
their behaviour. Furthermore, the results outline a link between the dynamical behaviour
of skyrmions and their distinct topological properties, with possible ramifications for
skyrmionic spin structures research including technological applications.
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