Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 11: Focus: Progress in Spin-Polarized Electron Spectroscopies

MA 11.5: Hauptvortrag

Montag, 16. März 2015, 17:30–18:00, EB 301

Prospects of Multichannel Spin Detection — •Gerd Schönhense — Institut für Physik, Johannes Gutenberg-Universität, 55128 Mainz

The high level of sophistication of a modern hemispherical analyzer (HA), detecting N>10^4 data points in parallel, contrasts with present days' spin detectors. Their figures of merit (FoM) only slightly improved during the last decades. Multichannel spin detection in combination with a HA [1] was a major step forward, owing to its 2D figure of merit FoM_2D=N*FoM (with N=800 in [1]). This detector e.g. allows probing the half-metallicity of Heusler compounds like Co2MnSi [2], whose high reactivity poses a challenge to reliable spin measurements. Going further in parallelization, an imaging spin filter in a cathode-lens type microscope yields unprecedented spin-resolving acquisition speed with N=5000 data points in parallel [3]. Finally, a 3D-method for spin-resolved momentum microscopy with utmost efficiency is developed by Univ. of Mainz and Max-Planck-Institute in Halle. This instrument implements the superior resolution and parallel acquisition capability of ToF photoemission microscopy. A challenging target for multichannel spin detection is Spin-HAXPES, suffering from extremely low cross sections. -- [1] M.Kolbe et al., PRL 107 (2011) 207601; [2] M.Jourdan et al., Nature Mat. 5 (2014) 3974; [3] C.Tusche et al., APL 99 (2011) 032505 and C.Tusche, talk at this conference.