Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Poster I
MA 20.40: Poster
Dienstag, 19. März 2024, 16:30–19:00, Poster A
Growth of Perpendicular Magnetic Anisotropy in Gallium-substituted Yttrium Iron Garnet Thin Films — •Kilian Lenz1, Olga Gladii1, Javier Pablo-Navarro1, Antje Oelschlägel1, René Heller1, Jürgen Lindner1, Oleksii Surzhenko2, and Carsten Dubs2 — 1Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Dresden — 2INNOVENT e.V. Technologieentwicklung, Prüssingstrasse 27B, 07745 Jena
The substitution of Fe lattice sites of yttrium iron garnet (YIG) liquid-phase-epitaxy-grown films with non-magnetic Ga ions creates a significant perpendicular magnetic anisotropy (PMA). Magnetometry and broadband ferromagnetic resonance were performed to test the magnetic characteristics of these Ga:YIG thin films. The Ga content was varied between 1.1–1.3 f.u. for various thicknesses from 30 to 230 nm. The Ga reduces the remanent magnetization and together with the tensile strain causes a stronger PMA. This results in a drastically increased negative effective magnetization for Ga:YIG films, favoring an out-of-plane easy axis.
We also demonstrate that, independent of the thickness and of the substrate orientation [(001) vs. (111)], the perpendicular magnetic anisotropy gradually increases with increasing Ga-content, resulting in a 14 times larger perpendicular anisotropy for 1.3 f.u. Ga-content compared to pure YIG. This allows for easy tuning of the PMA by simply varying the Ga concentration. One advantage of YIG almost remains, i.e. the Gilbert-damping increases only slightly with the amount of Ga.
Keywords: ferromagnetic resonance; YIG; damping; ferrimagnetic insulators; spin waves