Obszar badań: | Magnonics | Rok: | 2019 |
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Rodzaj publikacji: | Artykuł | Słowa kluczowe: | magnonics, magnonic crystals, band gaps |
Autorzy: | |||
Czasopismo: | Physical Review B | Wolumin: | 100 |
Strony: | 214410 | ||
BibTex: |
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Streszczenie: | By means of the plane-wave method, we study nonuniform, i.e., mode- and k-dependent, effects in the spinwave
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 gap. 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. |
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