Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 45: Poster Tuesday: Ultrafast Processes

O 45.6: Poster

Tuesday, April 2, 2019, 18:00–20:00, Poster D

Development of time-resolved photoemission electron microscopy of magnetization dynamics triggered by back-side illumination — •Maximilian Paleschke, Cheng-Tien Chiang, and Wolf Widdra — Institute of Phyiscs, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany

Over the last decades, both ultrafast microscopy and spintronics have progressed in a remarkable manner. Experimental and theoretical methods have been developed in order to understand and control the spin transport and magnetization dynamics approaching the spatial-temporal limit of available techniques [1]. Supported by the newly founded CRC/TRR 227 Ultrafast Spin Dynamics we set up an experiment for spin and magnetization dynamics of magnetic thin films on nanometer-femtosecond scales. Our approach combines state-of-the-art time-resolved photoemission electron microscopy (PEEM) with a back-side pumping geometry. With this setup, we image magnetic domains using magnetic dichroism in photoemission [2] and record nm-fs movies of domain switching and domain wall motion triggered by fs spin and optical excitations. In this poster, we will present our experimental setup including quantitative estimations of the excitation density required to trigger ultrafast magnetization dynamics, the accessible temporal resolution, as well as the size of the magnetic linear and circular dichroic effects in PEEM.

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

[2] C. M. Schneider, G. Schönhense, Rep. Prog. Phys. 65, 1785 (2002); W. Kuch, C. M. Schneider, ibid. 64, 147 (2001)