Reprogrammability and Scalability of Magnonic Fibonacci Quasicrystals

Lisiecki, Filip; Rychły, Justyna; Kuświk, Piotr; Głowiński, Hubert; Kłos, Jarosław W.; Groß, Felix; Bykova, Iuliia; Weigand, Markus; Zelent, Mateusz; Goering, E.; Schütz, Gisela; Gubbiotti, G.; Krawczyk, Maciej; Stobiecki, F.; Dubowik, J.; Gräfe, Joachim

doi:10.1103/physrevapplied.11.054003

Cited by 38 publications

(32 citation statements)

References 38 publications

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“…Note that the arrangement of nanoholes is related to a 1D Fibonacci sequence, which suggests the formation of a specific spin‐wave band structure. [ 37 ] For the same spin‐precessional frequency differently propagating magnon states are thereby created on a single chip in neighboring nanochannels. They enable dense wavelength division multiplexing (Figure S11, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…In contrast to photonics and plasmonics, [ 10–12 ] experimental studies on artificial ferromagnetic quasicrystals (AMQs) [ 28 ] which offer unconventional rotational symmetries and a great density of reciprocal vectors are in their infancy. [ 21,29,30 ] Corresponding dynamic magnetic responses in 2D quasicrystals have neither been classified nor fully exploited in view of manipulation and control of magnons.…”

Section: Introductionmentioning

confidence: 99%

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Direct Observation of Worm‐Like Nanochannels and Emergent Magnon Motifs in Artificial Ferromagnetic Quasicrystals

Watanabe

Bhat

Baumgaertl

et al. 2020

Adv Funct Materials

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Quasicrystalline structures and aperiodic metamaterials find applications ranging from established consumer gadgets to potential high‐tech photonic components owing to both complex arrangements of constituents and exotic rotational symmetries. Magnonics is an evolving branch of magnetism research where information is transported via magnetization oscillations (magnons). Their control and manipulation are so far best accomplished in periodic metamaterials which exhibit properties artificially modulated on the nanoscale. They give rise to functional components, such as band stop filters, magnonic transistors and nanograting couplers. Here, spin‐wave excitations in artificial ferromagnetic quasicrystals created via aperiodic arrangement of nanoholes are studied experimentally. Their ten‐fold rotational symmetry results in multiplexed magnonic nanochannels, suggesting a width down to 50 nm inside a so‐called Conway worm. Key elements of design are emergent magnon motifs and the worm‐like features which are scale‐invariant and not present in the periodic metamaterials. By imaging wavefronts in quasicrystals, insight is gained into how the discovered features materialize as a dense wavelength division multiplexer.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct Observation of Worm‐Like Nanochannels and Emergent Magnon Motifs in Artificial Ferromagnetic Quasicrystals

Watanabe

Bhat

Baumgaertl

et al. 2020

Adv Funct Materials

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“…The bicomponent MQCs based on a Fibonacci sequence (1D) and Penrose tiling (2D) exhibited a multilevel structure of magnonic bandgaps in simulations ( 11 , 13 ). These gaps and SW propagation in 1D quasicrystals were evidenced using Brillouin light scattering (BLS) and x-ray microscopy techniques ( 14 , 15 ). Furthermore, worm-like nanochannels found in 2D antidot quasicrystals gave rise to an unprecedented demultiplexing process with microwaves that showed distinct advantages over demultiplexing process in photonics ( 12 ).…”

Section: Introductionmentioning

confidence: 99%

Direct observation of multiband transport in magnonic Penrose quasicrystals via broadband and phase-resolved spectroscopy

et al. 2021

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Quasicrystals are aperiodically ordered structures with unconventional rotational symmetry. Their peculiar features have been explored in photonics to engineer bandgaps for light waves. Magnons (spin waves) are collective spin excitations in magnetically ordered materials enabling non–charge-based information transmission in nanoscale devices. Here, we report on a two-dimensional magnonic quasicrystal formed by aperiodically arranged nanotroughs in ferrimagnetic yttrium iron garnet. By phase-resolved spin wave imaging at gigahertz frequencies, multidirectional emission from a microwave antenna is evidenced, allowing for a quasicontinuous radial magnon distribution, not observed in reference measurements on a periodic magnonic crystal. We observe partial forbidden gaps, which are consistent with analytical calculations and indicate band formation as well as a modified magnon density of states due to backfolding at pseudo-Brillouin zone boundaries. The findings promise as-desired filters and magnonic waveguides reaching out in a multitude of directions of the aperiodic lattice.

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“…The concept of controlling spin-wave band gaps and properties by adjusting interactions between the magnetic components is being explored [119][120][121] . In artificial spin ice, this control can be achieved with end canting 115 and by choosing interfaces designed to induce chiralsymmetry-breaking Dzyaloshinskii-Moriya interactions.…”

Section: Fast Dynamicsmentioning

confidence: 99%

Advances in artificial spin ice

et al. 2019

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Artificial spin ices consist of nanomagnets arranged on the sites of various periodic and aperiodic lattices. They have enabled the experimental investigation of a variety of fascinating phenomena such as frustration, emergent magnetic monopoles and phase transitions that have previously been the domain of bulk spin crystals and theory , as we discuss in this Review. Artificial spin ices also show promise as reprogrammable magnonic crystals and, with this in mind, we give an overview of the measurements of fast dynamics in these magnetic metamaterials. We survey the variety of geometries that have been implemented, in terms of both the form of the nanomagnets and the lattices on which they are placed, including quasicrystalline systems and artificial spin systems in 3D. Different magnetic materials can also be incorporated to modify anisotropies and blocking temperatures, for example. With this large variety of systems, the way is open to discover new phenomena, and we complete this Review with possible directions for the future.

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Reprogrammability and Scalability of Magnonic Fibonacci Quasicrystals

Cited by 38 publications

References 38 publications

Direct Observation of Worm‐Like Nanochannels and Emergent Magnon Motifs in Artificial Ferromagnetic Quasicrystals

Direct Observation of Worm‐Like Nanochannels and Emergent Magnon Motifs in Artificial Ferromagnetic Quasicrystals

Direct observation of multiband transport in magnonic Penrose quasicrystals via broadband and phase-resolved spectroscopy

Advances in artificial spin ice

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