Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 31: Poster II

MA 31.26: Poster

Wednesday, March 19, 2025, 17:00–19:30, P1

Setting up current-induced spin-wave Doppler shift experiments — •Linda Nesterov, Julian Straßburger, Johannes Demir, Karsten Rott, and Timo Kuschel — Universität Bielefeld, Germany

The coupling of coherent spin waves with incoherent spin transport, such as spin-polarized electrons, results in the transfer of angular momentum via spin-transfer torque, enabling the so-called spin-wave Doppler shift [1]. Our research aims to deepen the understanding of this fundamental process, which plays a significant role in the development of next-generation memory devices and other spintronic applications. Propagating spin-wave spectroscopy is used to detect a possible Doppler shift in spin waves generated by charge currents in a 20 nm thick Ni₈₁Fe₁₉ strip. The experiments are conducted using a vector network analyzer with both in-plane and out-of-plane magnetic fields applied perpendicular to the direction of the propagating spin wave, which is excited with the use of a coplanar waveguide design. In contrast to published works [1,2], this study uses Ta₂O₅ as an insulating material, chosen for its high permittivity, leading to a different impedance matching within the system.

[1] V. Vlaminck, M. Bailleul, Science 322, 410 (2008)

[2] J. Lucassen et al., Appl. Phys. Lett. 115, 012403 (2019)

Keywords: Propagating spin-wave spectroscopy; Current-induced spin dynamics; Spintronics