Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 30: Ultrafast Magnetization III
MA 30.1: Talk
Wednesday, March 18, 2020, 09:30–09:45, HSZ 101
Conical Mirror XUV Polarimeter for complete ultrafast magnetic sampling at M- edges of Fe, Co & Ni — •Christian Strüber1,2, Bertram Friedrich1, Felix Willems1, Piet Hessing1, Kelvin Yao1, Wolfgang Dietrich Engel1, Daniel Schick1, Bastian Pfau1, Clemens von Korff Schmising1, and Stefan Eisebitt1,3 — 1Max-Born-Institut, Berlin — 2Freie Universität Berlin — 3Technische Universität Berlin
Transient XUV absorption spectroscopy at 3p to 3d transitions (M-edges) probes changes to the magnetic dichroism initiated by a visible/NIR pump pulse. In a complementary technique the Faraday rotation of linear XUV pulses transmitted through thin magnetic layers is observed with an XUV polarization analyzer. In current setups the polarization detector needs to be rotated slowing down acquisition. We present a conical mirror XUV (COMIX) polarimeter for ultrafast magnetic investigations that access the full complex dichroic index of refraction. Due to the rotational symmetry of the device the COMIX polarimeter samples all rotation angles simultaneously. By observing the magnetically dependent changes in ellipticity Δε and orientation Δθ of the polarization state after transmitting through thin magnetic samples the full complex magneto-optical functions are measured. In a first demonstration of the COMIX polarimeter's capabilities, we compare Faraday measurements at FeGd samples performed at synchrotron and HHG sources.