Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetic measurement methods

MA 15.3: Talk

Tuesday, March 17, 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 Wilson^1,2,4, Denis Rudolf^1,2,4, Christian Weier^3,4, Roman Adam^4,5, Gerrit Winkler^4,5, Robert Frömter^4,5, Serhiy Danylyuk^4,5, Klaus Bergmann^4,5, Detlev Grützmacher^2,4, Claus M. Schneider^3,4, and Larissa Juschkin^1,2,4 — 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.