SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 8: Ultrafast Magnetization Effects I

MA 8.6: Vortrag

Montag, 27. März 2023, 16:30–16:45, HSZ 04

Laser-induced spin polarization on ultrafast time scales — •Oliver Busch, Franziska Ziolkowski, Ingrid Mertig, and Jürgen Henk — Institut für Physik, Martin-Luther-Universität, D-06099 Halle

In ultrafast spin dynamics one focuses often on demagnetization. However, the incident laser pulse should produce spin-polarized excited electrons – an effect ubiquitous in spin- and angle-resolved photoemission [1]. This laser-induced spin polarization certainly affects the ultrafast dynamics.

We study systematically the laser-induced spin polarization and its effect on the electron dynamics in Co/Cu heterostructures, modeled within our theoretical framework evolve [2]. The spin polarization depends strongly on polarization and angle of incidence of the femtosecond laser pulse, similar to photoemission [3]. Moreover, we find a significant spatial dependence, which underlines the importance of inhomogeneities in ultrafast spin dynamics.

[1] W. Schattke and M. A. Van Hove (eds.), Solid-State Photoemission and Related Methods: Theory and Experiment (Wiley-VCH, Weinheim, 2003)

[2] F. Töpler et al., New J. Phys. 23 033042 (2021)

[3] J. Henk et al., J. Phys.: Condens. Matter 8 47 (1996)