Research Area: | Magnonics | Year: | 2019 |
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Type of Publication: | Article | Keywords: | spin waves, magnonics, magnonic crystals |
Authors: |
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Journal: | Physical Review B | Volume: | 100 |
Pages: | 224428 | ||
BibTex: |
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Abstract: | One-dimensional planar magnonic crystals are usually fabricated as a sequence of stripes intentionally or
accidentally separated by nonmagnetic spacers. The influence of spacers on shaping the spin-wave spectra is
complex and still not completely clarified.We perform detailed numerical studies of the one-dimensional singleand
bicomponent magnonic crystals comprised of a periodic array of thin ferromagnetic stripes separated by
nonmagnetic spacers. We show that the dynamic dipolar interactions between the stripes, mediated even by
ultranarrow nonmagnetic spacers, lead to a significant increase in the frequency of the ferromagnetic resonance
mode, while simultaneously reducing the spin-wave group velocity. We attribute these spectral deformations
to the modifications of dipolar pinning and shape anisotropy, both of which are dependent on the width of the
spacers and the thickness of the stripes, as well as changes with the dynamical magnetic volume charges formed
due to inhomogeneous spin-wave amplitude. |
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