Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetic measurement methods
MA 15.3: Vortrag
Dienstag, 17. März 2015, 10:00–10:15, H 1012
Generation of circularly polarized radiation from a compact plasma-based extreme ultraviolet light source for tabletop X-ray magnetic circular dichroism studies — •Daniel Wilson1,2,4, Denis Rudolf1,2,4, Christian Weier3,4, Roman Adam4,5, Gerrit Winkler4,5, Robert Frömter4,5, Serhiy Danylyuk4,5, Klaus Bergmann4,5, Detlev Grützmacher2,4, Claus M. Schneider3,4, and Larissa Juschkin1,2,4 — 1Experimental Physics of EUV, RWTH Aachen University — 2Peter Grünberg Institut (PGI-9), Research Centre Jülich GmbH — 3Peter Grünberg Institut (PGI-6), Research Centre Jülich GmbH — 4Institut für Angewandte Physik, Universität Hamburg — 5Chair for Technology of Optical Systems, RWTH Aachen University
We present a compact apparatus for generation of linearly and circularly polarized EUV radiation from a gas-discharge plasma light source between 50 eV and 70 eV photon energy. In this spectral range, the 3p absorption edges of Fe (54 eV), Co (60 eV), and Ni (67 eV) offer a high magnetic contrast often employed for magneto-optical and electron spectroscopy as well as for magnetic imaging. We simulated and designed an instrument for generation of linearly and circularly polarized EUV radiation and performed polarimetric measurements of the degree of linear and circular polarization. Furthermore, we demonstrate first measurements of the X-ray magnetic circular dichroism at the Co 3p absorption edge with a plasma-based EUV light source. Our approach opens the door for laboratory-based, element-selective spectroscopy of magnetic materials and microscopy of ferromagnetic domains.