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A strong correlation between magnetic interaction and topological symmetriesleads to unconventional magneto-transport behavior. Weyl fermions inducetopologically protected spin-momentum locking, which is closely related tospin-wave gap formation in magnetic crystals. Ferromagnetic SrRuO3, regarded asa strong candidate for Weyl semimetal, inherently possesses a nonzero spin-wavegap owing to its strong magnetic anisotropy. In this paper, we propose a methodto control the spin-wave dynamics by nanolayer designing of the SrRuO3/SrTiO3superlattices. In particular, the six-unit-cell-thick SrRuO3 layers within thesuperlattices undergo a phase transition in crystalline symmetry fromorthorhombic to tetragonal, as the thickness of the SrTiO3 layers is modulatedwith atomic-scale precision. Consequently, the magnetic anisotropy, anomalousHall conductivity, and spin-wave gap could be systematically manipulated. Suchcustomization of magnetic anisotropy via nanoscale heterostructuring offers anovel control knob to tailor the magnon excitation energy for future spintronicapplications, including magnon waveguides and filters. Our nanolayer approachunveils the important correlation between the tunable lattice degrees offreedom and spin dynamics in topologically non-trivial magnetic materials.

Symmetry-Driven Spin-Wave Gap Modulation in Nanolayered SrRuO3/SrTiO3 Heterostructures: Implications for Spintronic Applications