A switchable spin-wave signal splitter for magnonic networks

Heussner, Frank; Serga, Alexander A.; Brächer, Thomas; Hillebrands, B.; Pirro, Philipp

doi:10.1063/1.4987007

Cited by 42 publications

(37 citation statements)

References 38 publications

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“…Considering a fixed spin‐wave frequency, this anisotropy can lead to a (nearly) unchanged direction of the group velocity vector for a broad range of wavevectors. In this case, a focusing of spin‐wave energy into designated propagation directions occurs which results in the creation of strong spin‐wave beams . A change of the spin‐wave frequency leads to modified directions of the group velocity vector and, subsequently, to a change of the focused beam direction, as has been experimentally demonstrated .…”

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confidence: 79%

“…In magnonic networks, the interconnections between logic elements are realized via narrow stripes of magnetic material, so called spin‐wave waveguides. Hence, it is very suitable to perform the creation of caustic‐like spin‐wave beams within these networks by attaching an input waveguide to a widened film area . Based on this approach, the geometry to study the frequency dependence of caustic‐like spin‐wave beams in microstructured ferromagnets is chosen as shown in Figure a.…”

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confidence: 99%

“…The sharp transition from the waveguide to the broad magnetic area ( x = 0 μm) acts as a point‐like source for secondary SW exhibiting a broad wavevector spectrum, which leads to the creation of caustic‐like spin‐wave beams as discussed above. In contrast to previous works, the input waveguide is positioned on the edge of the widened area. The boundary of the magnetic structure leads to a reflection of spin‐wave energy rather than to its total absorption .…”

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confidence: 99%

“…It consists of another widened film area and two 1.5 μm wide output waveguides. The transition zones of the outputs of both the combiner and the demultiplexer are specially tailored and their positions are adjusted to ensure an efficient channeling of spin‐wave energy into the subsequent waveguides according to the occurring beam directions …”

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confidence: 99%

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Frequency‐Division Multiplexing in Magnonic Logic Networks Based on Caustic‐Like Spin‐Wave Beams

Heussner

Nabinger

Fischer

et al. 2018

Physica Rapid Research Ltrs

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Wave-based data processing by spin waves (SW) and their quanta, magnons, is a promising technique to overcome the challenges which CMOS-based logic networks are facing nowadays. The advantage of these quasi-particles lies in their potential for the realization of energy efficient devices on the micro-to nanometer scale due to their charge-less propagation in magnetic materials. In this paper, the frequency dependence of the propagation direction of caustic-like spin-wave beams in microstructured ferromagnets is studied by micromagnetic simulations. Based on the observed alteration of the propagation angle, an approach to spatially combine and separate spinwave signals of different frequencies is demonstrated. The presented magnetic structure constitutes a prototype design of a passive circuit enabling frequency-division multiplexing (FDM) in magnonic logic networks. It is verified that spin-wave signals of different frequencies can be transmitted through the device simultaneously without any interaction or creation of spurious signals. Due to the wave-based approach of computing in magnonic networks, the technique of FDM can be the basis for parallel data processing in single magnonic devices, enabling the multiplication of the data throughput.Multiplexing is a widely used technique of data transmission in telecommunication or computer networks. [1] The common aim of all different realizations of this concept is to transfer multiple data signals through a shared transmission line. [2][3][4][5][6] In view of the different challenges todays CMOS technology is facing, [7] the concept of multiplexing is also very interesting for new approaches of data processing like, for example, the field of magnonics. [8][9][10][11][12][13][14] In this case, spin waves (SW) are used to transport data [15][16][17] and the information can be encoded in their amplitude or phase. [18] This approach is especially interesting since wave-based logic can be realized by utilizing interference effects [19] of the SW as has been shown by, for example, the development of the spin-wave majority gate [20,21] and other interferometer-based devices. [22,23] Aiming at an efficient signal transport in magnonic circuits, spin-wave multiplexers enabling time-division multiplexing have already been experimentally demonstrated. [24,25] In this case, the information carrying spin-wave signals are getting temporally separated, successively transferred through the shared magnonic waveguide and finally allocated to different output waveguides by the spin-wave (de-) multiplexer.In contrast, frequency-division multiplexing (FDM) enables a simultaneous transport of data. [1,26] The bandwidth of the transmission medium is divided into separated frequency channels and the data signals are simultaneously transferred at different frequencies. This approach is heavily used in a broad range of applications, from radio broadcasting and fiber optics to communication satellites. [3][4][5][6] However, since the data handling is realized by transistor-based logic elemen...

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confidence: 79%

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confidence: 99%

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confidence: 99%

mentioning

confidence: 99%

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Frequency‐Division Multiplexing in Magnonic Logic Networks Based on Caustic‐Like Spin‐Wave Beams

Heussner

Nabinger

Fischer

et al. 2018

Physica Rapid Research Ltrs

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“…For example, in microwave engineering, guiding devices such as power dividers, circulators, filters couplers and multiplexer are commonly used [1]. Multiport devices can be realized in different ways employing resonant structures [1][2][3], photonic crystals [4][5][6], metamaterials [7,8] as well as waveguides with multimode interferences [9,10]. In electromagnetics, selected filters and multiplexers have also been implemented by using structured materials as nonuniform waveguide network [11,12] and complex photonic circuits are studied and designed for optical signal processing or computing in integrated optics [13].…”

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confidence: 99%

Multi-functional resonant acoustic wave router

Richoux¹,

Achilleos²,

Theocharis³

et al. 2020

J. Phys. D: Appl. Phys.

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We demonstrate that asymmetric 3-port devices can be used to design a multi-functional set-up operating as a symmetric combiner and splitter at the same frequency. For a concrete implementation of the proposed multi-functionality protocol, we employ a resonant acoustic 3-port device operating in a subwavelength regime, showing splitting/combining abilities with nearly perfect transmission in presence of losses, induced by the interactions of the system's resonances. Finally, as an extension of the 3-port multi-functionality concept, we propose a new type of 4-port networks, consisting in an assembly of 3-port unit cells with combining/splitting properties, capable to achieve various wave guiding features with perfect transmission depending on the phase of the inputs.

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Reconfigurable Ferromagnetic Resonances by Engineering Inhomogeneous Magnetic Textures in Artificial Magnonic Crystals

Zhao

et al. 2022

Adv Funct Materials

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Advanced microfabrication gives rise to an extra degree of freedom for controlling magnetic textures, which determine the spin dynamics of thin‐film magnets for various spintronic devices. However, the intuitive understanding of complicated ferromagnetic resonances (FMRs) is still challenging for lacking directly observed evolution of inhomogeneous magnetic textures. This study demonstrates the reconfigurable FMRs by introducing artificial patterns of antidot lattices (namely magnonic crystals), mediated by the engineering of inhomogeneous magnetic textures. Ordered walls are observed directly in such a magnetic film using in situ Lorentz transmission electron microscopy. By applying in‐plane external magnetic fields, arc‐shaped domain walls can be nucleated along the edge of patterns, inducing the splitting of FMRs from a single peak to two branches (marked by low‐frequency and high‐frequency branches, respectively). Complementary micromagnetic simulations reconstruct the inhomogeneous magnetic textures and splitting of FMRs. It is indicated that the low‐frequency branch ascribes to the confined mode excited by arc‐shaped domain walls, and the high‐frequency one originates from the quasi‐uniform mode generated by in‐plane magnetization between arc‐shaped domain walls. These results offer new opportunities for designing patterned magnonic devices and understanding the unique phenomenon of spin dynamics.

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A switchable spin-wave signal splitter for magnonic networks

Cited by 42 publications

References 38 publications

Frequency‐Division Multiplexing in Magnonic Logic Networks Based on Caustic‐Like Spin‐Wave Beams

Frequency‐Division Multiplexing in Magnonic Logic Networks Based on Caustic‐Like Spin‐Wave Beams

Multi-functional resonant acoustic wave router

Reconfigurable Ferromagnetic Resonances by Engineering Inhomogeneous Magnetic Textures in Artificial Magnonic Crystals

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