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MA: Fachverband Magnetismus

MA 54: Altermagnets VI

MA 54.11: Vortrag

Freitag, 13. März 2026, 12:15–12:30, HSZ/0002

Evidence for spin split bands in RuO₂ investigated by ultrafast magnetization dynamics — •Kevin Jäckel¹, Holger Grisk¹, Niklas Dornquast¹, Jakob Walowski¹, Markus Münzenberg¹, Maik Gaerner², Günter Reiss², and Timo Kuschel^2,3 — ¹University of Greifswald, Germany — ²Bielefeld University, Germany — ³Johannes Gutenberg University Mainz, Germany

In the search for new materials suitable for spintronic applications, the recently discovered altermagnets open up novel paths of research. In our work we focus on the proposed d-wave altermagnetic material RuO₂ by measuring its magnetic response to circularly polarized ultrashort laser pulses. Hereby we propose a way to link its ultrafast demagnetization dynamics, which are accessed by employing time-resolved magneto-optical Kerr effect measurements, to other, well established material systems such as semiconducting GaAs or topological insulators [1]. Therefore, we measure both the real and imaginary parts of the Kerr rotation, which are the Kerr angle and the Kerr ellipticity related to magnetic circular birefringence and dichroism. We see a strong, transient response, which scatters on a femtosecond timescale and can be described by the Raman coherence time.

[1] https://doi.org/10.1038/srep15304

Keywords: Ultrafast Magnetization; RuO2; magneto-optical Kerr effect; Altermagnetism