Elasto-dipolar magnons—a new class of nonexchange spin-wave excitations

Prikhodko, Oleg; Sukhorukova, O. S.; Tarasenko, S. V.; Шавров, В. Г.

doi:10.1134/s0021364014170111

Cited by 1 publication

(1 citation statement)

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“…Within the second direction, researchers will face the challenge of developing a completely new theoretical formalism that will fully account for the rich and exciting complexities inherent to the Landau-Lifshitz equation. In addition to the already discussed anisotropic dispersion of magnetostatic and dipole-exchange spin waves, the challenges include the non-linearity of the Landau-Lifshitz equation [75,76] and exotic contributions to the magnetic energy, such as the magneto-elastic coupling [77,78] and (nonreciprocal) Dzyaloshinskii-Moriya [51,52] interaction, and magnetic dissipative function [79,80].…”

Section: Discussionmentioning

confidence: 99%

Graded-index magnonics

Davies¹,

Kruglyak²

2015

Low Temperature Physics

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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 longwavelength 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 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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