SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 22: Terahertz Spintronics
MA 22.4: Vortrag
Dienstag, 28. März 2023, 15:45–16:00, POT 6
Element-selective and THz study of spin dynamics in Fe/Ru/Ni tri-layer systems — •Christian Greb1,2, Roman Adam1, Daniel Bürgler1, Sarah Heidtfeld1,2, Markus Büscher1, 3, and Claus M. Schneider1,2 — 1Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich,52425 Jülich, Germany — 2Faculty of Physics, University of Duisburg-Essen, 47048 Duisburg, Germany — 3Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
Ultrafast spin dynamics induced by femtosecond optical laser pulses in ferromagnetic thin films are of great interest due to their high potential for future information technology. Relevant materials are often multi-element compounds or multilayer stacks. We present an element-selective study of Ni/Ru/Fe/MgO(capping) multilayers in which Ni and Fe layers are coupled either ferromagnetically or antiferromagnetically, depending on the Ru thickness. The spin dynamics in the multilayers can be explained by super-diffusive spin transport [1,2]. In addition to element-selective T-MOKE measurements using a high harmonic generation source, we measured and analyzed THz transients [3] to gain further insight into the non-equilibrium interlayer spin transport. We show that spin currents can be triggered at lower laser fluences (<1uJ/cm2) than previously reported [1]. The THz amplitude as a function of the external magnetic field gives insights into the interlayer exchange coupling. [1] D. Rudolf et al., Nature Commun. 3, 1037 (2012). [2] M. Battiato et al., Phys. Rev. Lett. 105, 027203 (2010). [3] R. Adam et al., Appl. Phys. Lett. 114, 212405 (2019).