Graded index lenses for spin wave steering

Whitehead, N. J.; Horsley, S. A. R.; Philbin, T. G.; Kruglyak, V. V.

doi:10.1103/physrevb.100.094404

Cited by 24 publications

(12 citation statements)

References 38 publications

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“…In the later studies, it was shown that by continuous varying the value of the magnetocrystalline anisotropy or saturation magnetization in a narrow region between the ferromagnetic waveguide and the thin film, an anomalous refractive effect can be obtained for SWs, allowing SWs to be efficiently bent in the waveguides [12]. This closely connects the magnonic metasurface studies with the graded-index approach in the design of magnonic devices [13], [14].…”

Section: Introductionmentioning

confidence: 81%

Control of the phase of reflected spin-waves from magnonic Gires-Tournois interferometer of subwavelength width

Sobucki,

Gruszecki,

Rychły

et al. 2021

Preprint

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The phase is one of the fundamental properties of a wave that allows to control interference effects and can be used to efficiently encode information. We examine numerically a magnonic resonator of the Gires-Tournois interferometer type, which enables the control of the phase of spin waves reflected from the edges of the ferromagnetic film. The considered interferometer consists of a Py thin film and a thin, narrow Py stripe placed above its edge, both coupled magnetostatically. We show that the resonances and the phase of the reflected spin waves are sensitive for a variation of the geometrical parameters of this bilayerd part of the system. The high sensitivity to film, stripe, and non-magnetic spacer thicknesses, offers a prospect for developing magnonic metasurfaces and sensors.

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Section: Introductionmentioning

confidence: 81%

Control of the phase of reflected spin-waves from magnonic Gires-Tournois interferometer of subwavelength width

Sobucki,

Gruszecki,

Rychły

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…To obtain the spin-wave dispersion relations and wave-packet trajectories, we employ standard Fourier transform techniques, described, e.g., in Refs. [29][30][31].…”

Section: Methodsmentioning

confidence: 99%

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Fripp

Kruglyak

2021

Phys. Rev. B

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We have used micromagnetic simulations to model backward-volume dipole-exchange spin waves in graded profiles of the bias magnetic field. We demonstrate spin-wave wavelength conversion upon the wave's reflection from turning points due to the two characteristic minima ("U points") occurring in their dispersion at finite (nonzero) wave vectors. As a result, backward-volume dipole-exchange spin waves confined in "spin-wave wells" either form Möbius modes, making multiple real-space turns for each reciprocal-space round trip, or split into pairs of degenerate modes in the valleys near the two U points. The latter modes may therefore be assigned a pseudospin. We show that the pseudospin can be switched by scattering the spin wave from decreases of the bias magnetic field, while it is immune to scattering from field increases. Pseudospin creation and read-out can be accomplished using chiral spin-wave transducers, as described in Au et al. [Appl. Phys. Lett. 100, 182404 (2012)] and Au et al. [Appl. Phys. Lett. 100, 172408 (2012)], respectively. Taken together, the possibility of pseudospin creation, manipulation, and read-out suggests a path to development of a spin-wave version of valleytronics ("magnon valleytronics"), in which the pseudospin (rather than amplitude or phase) of spin waves would be used to encode data. Our results are not limited to graded bias magnetic field but can be generalized to other magnonic media with spatially varying characteristics, produced using the toolbox of graded index magnonics.

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“…Fabrication of downscaled samples with relatively steep gradients of the magnonic index [329] is likely to be the main challenge for this concept. Theoretically, it needs to be extended to 2D problems, e.g., oblique incidence, and graded-index profiles, e.g., lenses [330]. Overall, it remains to see whether this idea will transform into a topic of practical value.…”

Section: Spin-wave Pseudospin and Magnon Valleytronicsmentioning

confidence: 99%

Advances in Magnetics Roadmap on Spin-Wave Computing

et al. 2022

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Magnonics addresses the physical properties of spin waves and utilizes them for data processing. Scalability down to atomic dimensions, operation in the GHz-to-THz frequency range, utilization of nonlinear and nonreciprocal phenomena, and compatibility with CMOS are just a few of many advantages offered by magnons. Although magnonics is still primarily positioned in the academic domain, the scientific and technological challenges of the field are being extensively investigated, and many proof-of-concept prototypes have already been realized in laboratories. This roadmap is a product of the collective work of many authors that covers versatile spin-wave computing approaches, conceptual building blocks, and underlying physical phenomena. In particular, the roadmap discusses the computation operations with Boolean digital data, unconventional approaches like neuromorphic computing, and the progress towards magnon-based quantum computing. The article is organized as a collection of sub-sections grouped into seven large thematic sections. Each sub-section is prepared by one or a group of authors and concludes with a brief description of current challenges and the outlook of further development for each research direction.

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Graded index lenses for spin wave steering

Cited by 24 publications

References 38 publications

Control of the phase of reflected spin-waves from magnonic Gires-Tournois interferometer of subwavelength width

Control of the phase of reflected spin-waves from magnonic Gires-Tournois interferometer of subwavelength width

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Advances in Magnetics Roadmap on Spin-Wave Computing

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