Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 41: Poster III

MA 41.45: Poster

Thursday, March 20, 2025, 15:00–17:30, P3

Spin-Orbit Torque in RuO₂|Py multilayer systems — •Niklas Schmolka, Maik Gaerner, Jan Schmalhorst, and Günter Reiss — Bielefeld University, Germany

Spin torques like the Spin-Orbit torque (SOT) offer fast and energy efficient data writing techniques in magnetic memory devices (MRAM). As a new class of materials, Altermagnets, like RuO₂, are able to generate a current induced SOT while possessing zero net magnetization. As such, Altermagnets offer multiple advantages compared to existing MRAM devices based on Ferromagnets like higher stability against external magnetic fields and THz Switching [1][2].

Here, we use the harmonic Hall measurement technique to determine the Spin Hall Angle (SHA) in RuO₂|Py multilayer system via the Harmonic Response Modell [3]. To accurately determine the SHA we first characterize our samples using X-ray diffraction, X-ray reflection, Alternating Gradient Magnetometry and measure the magnetization and the Anomalous Hall Effect. We compare our experimental results to the existing literature and reflect on the influence of the crystal structure on the generated spin current [4].

[1] A. Bose et al., Nat. Electron. 5 267 (2022)

[2] S. Schlauderer et al., Nature 569 383 (2019)

[3] M. Meinert et al., Phys. Rev. Applied 14 064011 (2020)

[4] H.Bai et al., Phys. Rev. Lett. 128 197202 (2022)

Keywords: Spintronics; Spin-Orbit Torque; harmonic Hall; Spin Hall Angle