Graded-index magnonics

Автор(и)

  • C.S. Davies School of Physics, University of Exeter, Stocker road, Exeter EX4 4QL, United Kingdom
  • V.V. Kruglyak School of Physics, University of Exeter, Stocker road, Exeter EX4 4QL, United Kingdom

DOI:

https://doi.org/10.1063/1.4932349%20

Ключові слова:

magnon, spin waves, graded-index, magnetization.

Анотація

The wave solutions of the Landau–Lifshitz equation (spin waves) are characterized by some of the most complex and peculiar dispersion relations among all waves. For example, the spin-wave (“magnonic”) dispersion can range from the parabolic law (typical for a quantum-mechanical electron) at short wavelengths to the nonanalytical linear type (typical for light and acoustic phonons) at long wavelengths. Moreover, the long-wavelength magnonic dispersion has a gap and is inherently anisotropic, being naturally negative for a range of relative orientations between the effective field and the spin-wave wave vector. Nonuniformities in the effective field and magnetization configurations enable the guiding and steering of spin waves in a deliberate manner and therefore represent landscapes of graded refractive index (graded magnonic index). By analogy to the fields of graded-index photonics and transformation optics, the studies of spin waves in graded magnonic landscapes can be united under the umbrella of the graded-index magnonics theme and are reviewed here with focus on the challenges and opportunities ahead of this exciting research direction.

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Опубліковано

2015-08-20

Як цитувати

(1)
Davies, C.; Kruglyak, V. Graded-Index Magnonics. Fiz. Nizk. Temp. 2015, 41, 976-983.

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