Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Poster I

MA 20.37: Poster

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

Integration of magnetic garnet thin films on a piezoelectric substrate — •Christian Holzmann, Stephan Glamsch, David Stein, Matthias Küß, and Manfred Albrecht — Institute of Physics, University of Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany

On one hand, rare earth iron garnets are the go-to material to study magnons due to their insulating nature and ultra-low Gilbert damping. On the other hand, surface acoustic waves (SAWs) are broadly used in modern devices, e.g. in RF filters. Therefore, exploiting the coupling of SAWs and magnons in garnets offers the potential to design highly efficient magneto-acoustic devices [1].
However, studies involving garnet thin films are mostly focused on epitaxially grown films, while the implementation on non-matching substrates is challenging [2]. In this regard, we show the growth of about 40 nm thick crystalline yttrium (YIG) as well as gadolinium iron garnet (GdIG) films on the often used piezoelectric substrate LiNbO₃. By combining film growth via pulsed laser deposition and a post-deposition annealing step, garnet recrystallization in a poly-crystalline phase is achieved. Notably, the YIG film shows an in-plane uniaxial magnetic anisotropy due to a non-isometric strain induced by the substrate, while the GdIG film possesses a magnetic compensation point close to room temperature.
[1] Küß et al., ACS Applied Electronic Materials, 5103 (2023).
[2] Holzmann et al., Encyclopedia of Materials: Electronics, 777 (2023).

Keywords: garnets; thin films; surface acoustic wave; uniaxial anisotropy; magnetic compensation point