Erlangen 2018 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 1: Optical Methods - EUV and x-ray Sources
K 1.5: Vortrag
Montag, 5. März 2018, 15:25–15:40, MB HS
Nanoscale magnetic imaging using high-harmonic radiation in the extreme-UV — •Ofer Kfir1,2, Sergey Zayko1, Christina Nolte1, Murat Sivis1, Marcel Möller1, Birgit Hebler3, Sri Sai Phani Arekapudi3, Daniel Steil1, Sascha Schäfer1, Manfred Albrecht3, Oren Cohen2, Stefan Mathias1, and Claus Ropers1 — 1University of Göttingen, Göttingen, Germany — 2Technion, Haifa, Israel — 3University of Augsburg, Augsburg, Germany
Pulsed extreme-UV (EUV) and X-ray beams offer a unique probe for element specific imaging of magnetic textures and their dynamics [1-3]. To date, such experimentas are available exclusively at synchrotrons and free-electron lasers, producing a high flux of coherent short-wavelength radiation with circular polarization.
Here, we demonstrate nanoscale magnetic imaging using high harmonic radiation. By controlling the circular polarization of the EUV beam [4], we harness resonant XMCD contrast of cobalt in a Co/Pd multilayer stack. We enhance the scattering signal by a strong auxiliary wave, comprised of multiple spatial waveguide modes [5]. The reconstructed image shows sub 50-nm spatial resolution. These results open the path towards an element-specific probing of magnetic dynamics at the nanometer- and femtosecond-scales, in a setup as compact as an optical table.
[1] Eisebitt, Nature, 432, 885 (2004) [2] Willems, Struct. Dynam. 4, 014301 (2017) [3] Büttner, Nat. Phys. 11 255 (2015) [4] Kfir, APL 108 211106 (2016) [5] Zayko, Opt. Exp. 23, 19911 (2015)