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MA: Fachverband Magnetismus

MA 20: Poster I

MA 20.5: Poster

Dienstag, 19. März 2024, 16:30–19:00, Poster A

Spin Hall driven spin-wave emission in PMA materials — •Moritz Bechberger¹, David Breitbach¹, Björn Heinz¹, Abbas Koujok¹, Bert Lägel¹, Carsten Dubs², Burkard Hillebrands¹, and Philipp Pirro¹ — ¹Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — ²INNOVENT e.V. Technologieent-wicklung, Jena, Germany

Spin currents have been used extensively in the research field of magnon spintronics, as they allow to compensate the damping of magnonic systems and the generation of coherent, nonlinear magnetic auto-oscillations. However, their application as a source for propagating spin waves is very limited, given the self-confining nature of the oscillation. Here, we investigate the spin-wave emission of an auto-oscillator in a yttrium iron garnet film substituted with gallium atoms (Ga:YIG), which causes a perpendicular magnetic anisotropy. When driven to high spin-wave amplitudes for in-plane configuration, this system exhibits a positive nonlinear frequency shift due to the negative effective magnetization. We inject a spin-current into the Ga:YIG film via the spin Hall effect by applying a DC current to an adjacent platium layer and study the dynamics of the auto-oscillation with respect to the nonlinear frequency shift and a potential spin-wave emission. This research is funded by the DFG - Project No. 271741898, TRR 173-268565370 (B01), and the ERC Grant No. 101042439 CoSpiN.

Keywords: Spin Waves; Magnonics; SHE; PMA; Auto-oscillation