Tunable Snell's law for spin waves in heterochiral magnetic films

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 re...

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Bibliographic Details
Published in:Physical review. B 2018-03, Vol.97 (10), Article 104422
Main Authors: Mulkers, Jeroen, Van Waeyenberge, Bartel, Milošević, Milorad V.
Format: Article
Language:English
Subjects:
Angles (geometry)
Ferromagnetic films
Ferromagnetic materials
Magnetic fields
Magnetic films
Magnons
Mathematical analysis
Snells law
Thin films
Wave propagation
Waveguides
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Summary: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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.97.104422