Tunable Snell's law for spin waves in heterochiral magnetic films
arXiv:1803.09648 · doi:10.1103/PhysRevB.97.104422
Abstract
Thin ferromagnetic films with an interfacially induced DMI exhibit nontrivial asymmetric dispersion relations that lead to unique and useful magnonic properties. Here we derive an analytical expression for the magnon propagation angle within the micromagnetic framework and show how the dispersion relation can be approximated with a comprehensible geometrical interpretation in the k-space of the propagation of spin waves. We further explore the refraction of spin waves at DMI interfaces in heterochiral magnetic films, after deriving a generalized Snell's law tunable by an in-plane magnetic field, that yields analytical expressions for critical incident angles. The found asymmetric Brewster angles at interfaces of regions with different DMI strengths, adjustable by magnetic field, support the conclusion that heterochiral ferromagnetic structures are an ideal platform for versatile spin-wave guides.
arXiv comment7 pages, 4 figures
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- Effect of inhomogeneous Dzyaloshinskii-Moriya interaction on antiferromagnetic spin-wave propagation
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- Tailoring High-Frequency Magnonics in Monolayer Chromium Trihalides
- Comparison of spin-wave transmission in parallel and antiparallel magnetic configurations
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- Propagation, generation, and utilization of topologically trivial magnetic solitons in magnetic nanowires