Omnidirectional spin-wave nanograting coupler

Yu, Haiming; Duerr, G.; Huber, Rupert; Bähr, M.; Schwarze, Thomas; Brandl, Florian; Grundler, D.

doi:10.1038/ncomms3702

Cited by 170 publications

(165 citation statements)

References 53 publications

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“…Alternative spin wave generation and detection methods based on magneto-elastic coupling in surfaceacoustic wave devices 10 are still under development and raise questions regarding their high frequency capability 11 . Longto-short wavelength conversion can be done in magnonic crystals 12 for a geometrically limited discrete set of wavevectors at the expense of high conversion loss. A better conversion efficiency can be obtained by periodically folded coplanar antennas 13,14 but this at the expense of any flexibility in the generated wavevevector.…”

Section: T Devoldermentioning

confidence: 99%

All electrical propagating spin wave spectroscopy with broadband wavevector capability

Ciubotaru

Devolder

Manfrini

et al. 2016

Applied Physics Letters

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We develop an all electrical experiment to perform the broadband phase-resolved spectroscopy of propagating spin waves in micrometer sized thin magnetic stripes. The magnetostatic surface spin waves are excited and detected by scaled down to 125 nm wide inductive antennas, which award ultra broadband wavevector capability. The wavevector selection can be done by applying an excitation frequency above the ferromagnetic resonance. Wavevector demultiplexing is done at the spin wave detector thanks to the rotation of the spin wave phase upon propagation. A simple model accounts for the main features of the apparatus transfer functions. Our approach opens an avenue for the all electrical study of wavevector-dependent spin wave properties including dispersion spectra or non-reciprocal propagation.Spin wave based computing 1 -a paradigm-shifting technology that uses the interference of spin waves-offers potential for significant power and area reduction per computing throughput with respect to complementary metaloxide-semiconductor (CMOS) transistor technology. Efficient solutions for spin wave routing 2,3 , spin wave emission 4 , amplification 1 , and spin wave combination 5,6 have been developed. However, these solutions often rely on materials that are difficult to integrate 7 into a CMOS environment. Moreover, they are often demonstrated only for long wavelength (≥ 1 µm) spin waves, for which the low group velocity limits the speed of computation and communication. Efficient methods to generate and detect spin waves with short wavelengths are still lacking. Inductive methods have commonly been employed for long wavelength spin waves as has Brillouin light scattering spectroscopy 8 , which is however diffraction limited and requires complex procedure to retrieve phase information 9 . Alternative spin wave generation and detection methods based on magneto-elastic coupling in surfaceacoustic wave devices 10 are still under development and raise questions regarding their high frequency capability 11 . Longto-short wavelength conversion can be done in magnonic crystals 12 for a geometrically limited discrete set of wavevectors at the expense of high conversion loss. A better conversion efficiency can be obtained by periodically folded coplanar antennas 13,14 but this at the expense of any flexibility in the generated wavevevector. Overall, none of the above methods has so far demonstrated the combination of phase resolution, broad frequency coverage, high sensitivity, and large wavevector (short wavelength) capability.In this work, we demonstrate that the use of deep submicron inductive antennas can circumvent these limitations and allow for the generation and detection of spin waves with ultra-wide frequency band capability and broad wavevector capability up to 15 − 20 rad/µm. We illustrate our method on micrometer-sized Permalloy stripes and describe its behavior within an analytic framework. Our method complements the advantages of Brillouin Light scattering in a compact all electrical device in which the phase resol...

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Section: T Devoldermentioning

confidence: 99%

All electrical propagating spin wave spectroscopy with broadband wavevector capability

Ciubotaru

Devolder

Manfrini

et al. 2016

Applied Physics Letters

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“…Dzyaloshinskii-Moriya interactions) [4][5][6][7][8][9][10] and on engineering new structures (e.g. magnonic crystals) for use in tailoring the propagation characteristics of spin waves [11][12][13][14][15][16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Traveling surface spin-wave resonance spectroscopy using surface acoustic waves

Gowtham

Moriyama

Ralph

et al. 2015

Journal of Applied Physics

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Coherent gigahertz-frequency surface acoustic waves (SAWs) traveling on the surface of a piezoelectric crystal can, via the magnetoelastic interaction, resonantly excite traveling surface spin waves in an adjacent thin-film ferromagnet. These excited surface spin waves, traveling with a definite in-plane wavevector q enforced by the SAW, can be detected by measuring changes in the electro-acoustical transmission of a SAW delay line. Here, we provide a demonstration that such measurements constitute a precise and quantitative technique for spin-wave spectroscopy, providing a means to determine both isotropic and anisotropic contributions to the spin-wave dispersion and damping. We demonstrate the effectiveness of this spectroscopic technique by measuring the spin-wave properties of a Ni thin film for a large range of wave vectors, q = 2.5 10 4 -8 10 4 cm -1 , over which anisotropic dipolar interactions vary from being negligible to quite significant.2

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“…Generally, the character of waves excited in a medium depends on the nature and properties of the medium itself as well as the spatial and temporal character of the excitation. There are a wide variety of spin-wave stimuli available to researchers and engineers studying magnetization dynamics, ranging from the more conventional localized, fast varying magnetic fields 1-3 to focused optical pulses, 4,5 spin-transfer-torque oscillators, 6,7 grating couplers, 8,9 and resonant magnetic transducers, 10,11 for example. In particular, the latter mechanism can be traced back to that proposed by Schl€ omann in Ref.…”

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confidence: 99%