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Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Thin Films: Magnetic Anisotropy

MA 28.1: Vortrag

Mittwoch, 20. März 2024, 15:00–15:15, EB 107

Surface Anisotropy in (110) Epitaxial Complex Oxide Thin Films — •Katharina Lasinger1,2, Yixuan Song1, Geoffrey S. D. Beach1, and Caroline A. Ross11Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139, USA — 2Department of Materials, ETH Zurich, CH-8093 Zurich, Switzerland

The demand for ever increasing density, and hence reduced dimensions, leads to a dominance of surface properties over their bulk counterparts in nano-scale magnetic devices. Spatial inversion symmetry is naturally broken at surfaces and interfaces. Surfaces on low symmetry planes, such as (110), can lead to a further in-plane anisotropic contribution. Using spin-Hall magnetoresistance measurements, we determine the in-plane and out-of-plane uniaxial anisotropy energies for a thickness series (5 - 50 nm) of europium iron garnet and thulium iron garnet epitaxially grown on a (110) gadolinium gallium substrate. We observe a large thickness dependence of the in-plane anisotropy energy, where the surface anisotropy energy is of the same sign and comparable in magnitude to the bulk value. Complex anisotropy landscapes can be tuned to act as a platform for enabling rich spin textures and dynamics [1,2] by taking advantage of the thickness and temperature dependence demonstrated in this work.

(Our Work: "Sizable In-Plane Surface Anisotropy in a (110) Epitaxial Complex Oxide Thin Film", about to be submitted.)

[1] O. R. Sulymenko, et al., Phys. Rev. Appl., 8(6), 064007, 2017.

[2] Y. Zhou, et al., Phys. Rev. Appl., 13(6), 064051, 2020.

Keywords: Surface anisotropy; Rare-earth iron garnets; (110) epitaxial films; Engineering anisotropy landscape; Spin dynamics

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