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- C. S. Davies
- University of Exeter School of Physics, , Stocker road, Exeter EX4 4QL, United Kingdom
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- V. V. Kruglyak
- University of Exeter School of Physics, , Stocker road, Exeter EX4 4QL, United Kingdom
書誌事項
- 公開日
- 2015-10-01
- DOI
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- 10.1063/1.4932349
- 公開者
- AIP Publishing
この論文をさがす
説明
<jats:p>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.</jats:p>
収録刊行物
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- Low Temperature Physics
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Low Temperature Physics 41 (10), 760-766, 2015-10-01
AIP Publishing