Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: Poster Session - Surface Magnetism

O 30.11: Poster

Montag, 16. März 2020, 18:15–20:00, P1A

Setup for time-resolved photoemission electron microscopy of ferromagnetic surfaces and magnetization dynamics triggered by back-side illumination — •Maximilian Paleschke, Cheng-Tien Chiang, and Wolf Widdra — Martin-Luther-Universität Halle-Wittenberg, Institute of Physics, Halle (Saale), Germany

Over the last 20 years, the growing interest in the field of ultrafast magnetism and spintronics sparked a demand for experimental techniques capable of detecting dynamical phenomena on the nanometer-femtosecond scale[1]. Our approach combines state-of-the-art time-resolved photoemission electron microscopy (tr-PEEM) with a back-side pumping geometry. A tunable laser system with MHz repetition rate and a wide selection of different wavelengths enhances the PEEM’s capabilities by eliminating inadvertent effects like space charge broadening. The setup is optimized to image magnetic nanostructures using magnetic valence band dichroism in photoemission[2,3]. In this poster, we will present the experimental setup and the achieved temporal and spatial resolutions. First results for ultrathin films of Fe grown on MgO(001) will be discussed.

[1] A. Kirilyuk et al., Rev. Mod. Phys. 82, 2731 (2010)

[2] C. M. Schneider, G. Schönhense, Rep. Prog. Phys. 65, 1785 (2002)

[3] W. Kuch, C. M. Schneider, Rep. Prog. Phys. 64, 147 (2001)