Waveguides as sources of short-wavelength spin waves for low-energy ICT applications

Papp, Á.; Csaba, G.; Dey, Himadri; Madami, M.; Porod, Wolfgang; Carlotti, G.

doi:10.1140/epjb/e2018-80623-x

Cited by 9 publications

(5 citation statements)

References 19 publications

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“…First, the inductive mechanism traditionally utilized to convert electrical signals into spin waves and back, is characterized by relatively low conversion efficiency. [13][14][15][16][17][18] Even if low conversion losses can be achieved in traditional macroscopic spin-wave devices with millimeter-scale dimensions, miniaturization of magnonic devices down to the submicrometer scale inevitably results in large conversion losses unacceptable for real-world applications. The second drawback of microscopic magnonic devices is associated with large propagation losses of spin waves in nanometer-thick magnetic films.…”

Section: Introductionmentioning

confidence: 99%

Spin–orbit-torque magnonics

Demidov

Urazhdin

Anane

et al. 2020

Journal of Applied Physics

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The field of magnonics, which utilizes propagating spin waves for nano-scale transmission and processing of information, has been significantly advanced by the advent of the spin-orbit torque. The latter phenomenon can allow one to overcome two main drawbacks of magnonic devices -low energy efficiency of conversion of electrical signals into spin wave signals, and fast spatial decay of spin waves in thin-film waveguiding structures. At first glance, the excitation and amplification of spin waves by spin-orbit torques can seem to be straightforward. Recent research indicates, however, that the lack of the mode-selectivity in the interaction of spin currents with dynamic magnetic modes and the onset of dynamic nonlinear phenomena represent significant obstacles. Here, we discuss the possible route to overcoming these limitations, based on the suppression of nonlinear spin-wave interactions in magnetic systems with perpendicular magnetic anisotropy. We show that this approach enables efficient excitation of coherent magnetization dynamics and propagating spin waves in extended spatial regions, and is expected to enable practical implementation of complete compensation of spin-wave propagation losses.

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Section: Introductionmentioning

confidence: 99%

Spin–orbit-torque magnonics

Demidov

Urazhdin

Anane

et al. 2020

Journal of Applied Physics

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“…One of the most versatile methods for spin‐wave emission is based on using patterned shaped microantennas, for generating a localized oscillating magnetic field in correspondence of the magnetic material . However, the emission of spin waves with sub‐micrometric wavelength is challenging due to the slow spatial decay of the field and the high impedance of the antennas as the size approaches nanoscale dimensions . Ferromagnetic nanostructures, spin‐transfer torque, spin‐orbit torques, spin currents, magnetoelastic coupling, and multiferroic heterostructures are alternative methods used for spin‐wave generation; however, they do not provide a straightforward control of the wavefront and beam shape.…”

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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“…For many device constructions, such a simple construction is insufficient. Microwave waveguides alone are fairly inefficient at short spin-wave wavelengths 10 and they are limited to generation of plane wavefronts or curved wavefronts with relatively small curvature. For generation of short-wavelength spin waves or non-planar wavefronts, lithographically patterning the edge of the magnetic film is desirable.…”

Section: Introductionmentioning

confidence: 99%

Experimental demonstration of a concave grating for spin waves in the Rowland arrangement

Papp

Kiechle

Mendisch

et al. 2021

Sci Rep

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We experimentally demonstrate the operation of a Rowland-type concave grating for spin waves, with potential application as a microwave spectrometer. In this device geometry, spin waves are coherently excited on a diffraction grating and form an interference pattern that focuses spin waves to a point corresponding to their frequency. The diffraction grating was created by focused-ion-beam irradiation, which was found to locally eliminate the ferrimagnetic properties of YIG, without removing the material. We found that in our experiments spin waves were created by an indirect excitation mechanism, by exploiting nonlinear resonance between the grating and the coplanar waveguide. Although our demonstration does not include separation of multiple frequency components, since this is not possible if the nonlinear excitation mechanism is used, we believe that using linear excitation the same device geometry could be used as a spectrometer. Our work paves the way for complex spin-wave optic devices—chips that replicate the functionality of integrated optical devices on a chip-scale.

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Waveguides as sources of short-wavelength spin waves for low-energy ICT applications

Cited by 9 publications

References 19 publications

Spin–orbit-torque magnonics

Spin–orbit-torque magnonics

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

Experimental demonstration of a concave grating for spin waves in the Rowland arrangement

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