Reversible tuning of omnidirectional band gaps in two-dimensional magnonic crystals by magnetic field and in-plane squeezing
| Autor: | S. Mamica, Maciej Krawczyk |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Band gap Demagnetizing field Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Crystal Lattice (order) 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Hexagonal lattice Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Omnidirectional antenna Excitation |
| DOI: | 10.48550/arxiv.1906.07469 |
| Popis: | By means of the plane wave method, we study nonuniform, i.e., mode- and k-dependent, effects in the spin-wave spectrum of a two-dimensional bicomponent magnonic crystal. We use the crystal based on a hexagonal lattice squeezed in the direction of the external magnetic field wherein the squeezing applies to the lattice and the shape of inclusions. The squeezing changes both the demagnetizing field and the spatial confinement of the excitation, which may lead to the occurrence of an omnidirectional magnonic band gaps. In particular, we study the role played by propagational effects, which allows us to explain the k-dependent softening of modes. The effects we found enabled us not only to design the width and position of magnonic band gaps, but also to plan their response to a change in the external magnetic field magnitude. This allows the reversible tuning of magnonic band gaps, and it shows that the studied structures are promising candidates for designing magnonic devices that are tunable during operation. Comment: Final version |
| Databáze: | OpenAIRE |
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