Snell’s Law for Spin Waves

Stigloher, J.; Decker, Martin; Körner, H. S.; Tanabe, Kenji; Moriyama, Takahiro; Taniguchi, Tomoyo; Harada, Hiroshi; Madami, M.; Gubbiotti, G.; Kobayashi, Kensuke; Ono, Teruo; Back, Christian

doi:10.1103/physrevlett.117.037204

Cited by 105 publications

(84 citation statements)

References 28 publications

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“…In summary, we have shown how the spin-wave dispersion relation in a chiral thin film with perpendicular anisotropy can be analyzed with a comprehensible geometrical representation, and derived a broadly-tunable Snell's law for a DMI interface, both checked against fullblown micromagnetic simulations. Bearing in mind the recent advances in direct imaging of incident, reflected and refracted spin waves in ferromagnetic films 41 , and the emergent atomically-thin heterosystems where DMI can be spatially adjusted [24][25][26][27] , we expect our findings to inspire further theoretical and experimental work to explore full versatility of heterochiral ferromagnetic films for otherwise unattainable magnonic properties and devices.…”

Section: Discussionmentioning

confidence: 85%

Tunable Snell's law for spin waves in heterochiral magnetic films

2018

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Thin ferromagnetic films with an interfacially-induced Dzyaloshinskii-Moriya interaction (DMI) exhibit non-trivial asymmetric dispersion relations that lead to unique and useful magnonic properties. Here we derive an analytical expression for the magnon propagation angle within the micromagnetic framework and show how the dispersion relation can be approximated with a comprehensible geometrical interpretation in the k-space of the propagation of spin waves. We further explore the refraction of spin waves at DMI interfaces in heterochiral magnetic films, after deriving a generalized Snell's law tunable by an in-plane magnetic field, that yields analytical expressions for critical incident angles. The found asymmetric Brewster angles at interfaces of regions with different DMI strengths, adjustable by magnetic field, support the conclusion that heterochiral ferromagnetic structures are an ideal platform for versatile spin-wave guides.

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Section: Discussionmentioning

confidence: 85%

Tunable Snell's law for spin waves in heterochiral magnetic films

2018

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“…In many aspects, ultra-thin BiYIG films offer new leverages for fine tuning of the magnetic properties with no drawbacks compared to the reference materials of these fields: YIG. BiYIG with its higher Faraday rotation coefficient (almost two orders of magnitude more than that of YIG) will increase the sensitivity of light based detection techniques that can be used (Brillouin light spectroscopy (BLS) or time resolved Kerr microscopy 34 ). Innovative schemes for on-chip magnon-light coupler could be now developed bridging the field of magnonics to the one of photonics.…”

Section: Resultsmentioning

confidence: 99%

Ultra-low damping insulating magnetic thin films get perpendicular

Soumah¹,

Beaulieu²,

Qassym³

et al. 2018

Nat Commun

173

114

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A magnetic material combining low losses and large perpendicular magnetic anisotropy (PMA) is still a missing brick in the magnonic and spintronic fields. We report here on the growth of ultrathin Bismuth doped Y3Fe5O12 (BiYIG) films on Gd3Ga5O12 (GGG) and substituted GGG (sGGG) (111) oriented substrates. A fine tuning of the PMA is obtained using both epitaxial strain and growth-induced anisotropies. Both spontaneously in-plane and out-of-plane magnetized thin films can be elaborated. Ferromagnetic Resonance (FMR) measurements demonstrate the high-dynamic quality of these BiYIG ultrathin films; PMA films with Gilbert damping values as low as 3 × 10−4 and FMR linewidth of 0.3 mT at 8 GHz are achieved even for films that do not exceed 30 nm in thickness. Moreover, we measure inverse spin hall effect (ISHE) on Pt/BiYIG stacks showing that the magnetic insulator’s surface is transparent to spin current, making it appealing for spintronic applications.

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“…To exploit the rich phenomenology of spin waves for integrated optically inspired processing, generating coherent spatially engineered wavefronts and controlling the propagation and interference of multiple spin‐wave beams are crucial. In addition, nonreciprocity, arising from the dipolar interactions, nonreciprocal coupling between spin waves and antennas, and the breaking of the top/bottom symmetry of the ferromagnetic films, represents an additional degree of freedom for the realization of devices.…”

mentioning

confidence: 99%

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

et al. 2020

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Integrated optically inspired wave‐based processing is envisioned to outperform digital architectures in specific tasks, such as image processing and speech recognition. In this view, spin waves represent a promising route due to their nanoscale wavelength in the gigahertz frequency range and rich phenomenology. Here, a versatile, optically inspired platform using spin waves is realized, demonstrating the wavefront engineering, focusing, and robust interference of spin waves with nanoscale wavelength. In particular, magnonic nanoantennas based on tailored spin textures are used for launching spatially shaped coherent wavefronts, diffraction‐limited spin‐wave beams, and generating robust multi‐beam interference patterns, which spatially extend for several times the spin‐wave wavelength. Furthermore, it is shown that intriguing features, such as resilience to back reflection, naturally arise from the spin‐wave nonreciprocity in synthetic antiferromagnets, preserving the high quality of the interference patterns from spurious counterpropagating modes. This work represents a fundamental step toward the realization of nanoscale optically inspired devices based on spin waves.

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Snell’s Law for Spin Waves

Cited by 105 publications

References 28 publications

Tunable Snell's law for spin waves in heterochiral magnetic films

Tunable Snell's law for spin waves in heterochiral magnetic films

Ultra-low damping insulating magnetic thin films get perpendicular

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

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