Magnons in a Quasicrystal: Propagation, Extinction, and Localization of Spin Waves in Fibonacci Structures

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

doi:10.1103/physrevapplied.11.054061

Cited by 40 publications

(14 citation statements)

References 41 publications

(60 reference statements)

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“…Above a critical driving power the high amplitude of the periodic magnetization pattern leads to a demagnetizing effect, reducing the magnetization along the in-plane bias field [27]. This is shown experimentally and from micromagnetic simulations in Fig.…”

mentioning

confidence: 70%

Real space observation of magnon interaction with driven space-time crystals

Träger,

Gruszecki,

Lisiecki

et al. 2019

Preprint

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The concept of Space-Time Crystals (STC), i.e. translational symmetry breaking in time and space, was recently proposed and experimentally demonstrated for quantum systems. Here, we transfer this concept to magnons and experimentally demonstrate a driven STC at room temperature. The STC is realized by strong homogeneous micro-wave pumping of a micron-sized permalloy (Py) stripe and is directly imaged by Scanning Transmission X-ray Microscopy (STXM). For a fundamental understanding of the formation of the STC, micromagnetic simulations are carefully adapted to model the experimental findings. Beyond the mere generation of a STC, we observe the formation of a magnonic band structure due to back folding of modes at the STC's Brillouin zone boundaries. We show interactions of magnons with the STC that appear as lattice scattering. This results in the generation of ultra short spin waves down to 100 nm wavelength that cannot be described by classical dispersion relations for linear spin wave excitations. We expect that room temperature STCs will be a useful tool to investigate non-linear wave physics, as they can be easily generated and manipulated to control their spatial and temporal band structure.

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confidence: 70%

Real space observation of magnon interaction with driven space-time crystals

Träger,

Gruszecki,

Lisiecki

et al. 2019

Preprint

Self Cite

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“…The proposed approach can be verified experimentally by the state of the art techniques, like an XMCD 53,54 , phase-resolved BLS 55 or broadband microwave spectroscopy 32,56 . We believe that our findings are substantial for further development of the circuits for analog and digital computing based on SWs and contribute to the field of magnonics.…”

Section: Discussionmentioning

confidence: 93%

An anomalous refraction of spin waves as a way to guide signals in curved magnonic multimode waveguides

Mieszczak,

Busel,

Gruszecki

et al. 2020

Preprint

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We present a method for efficient spin wave guiding within the magnonic nanostructures. Our technique is based on the anomalous refraction in the metamaterial flat slab. The gradual change of the material parameters (saturation magnetization or magnetic anisotropy) across the slab allows tilting the wavefronts of the transmitted spin waves and controlling the refraction. Numerical studies of the spin wave refraction are preceded by the analytical calculations of the phase shift acquired by the spin wave due to the change of material parameters in a confined area. We demonstrate that our findings can be used to guide the spin waves smoothly in curved waveguides, even through sharp bends, without reflection and scattering between different waveguide's modes, preserving the phase -the quantity essential for wave computing.

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“…The plasmonic group velocity around this frequency is reduced to 0.44c (c is free-space light velocity), which suggests the possibility for enhanced light-matter interactions. Such a scheme has been demonstrated to tune the dispersion and open a band gap for magnons in 1D Fibonacci quasicrystals [90], possibly enabling tuning of magnon polaritons.…”

Section: Extreme Dispersion Engineering In Moiré Metasurfacesmentioning

confidence: 99%

Tailoring Light with Layered and Moiré Metasurfaces

Wang

Mazor

et al. 2021

Trends in Chemistry

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Optical metasurfaces are assemblies of subwavelength, artificially designed inclusions forming planarized devices with unprecedented capabilities to manipulate electromagnetic waves and facilitate multiple functionalities. Recent topical efforts in this research area have been focused on pushing forward the frontiers of enhanced light-matter interactions exploiting new concepts and fabrication capabilities. In this context, layered and twisted metasurfaces have showcased interesting features, including flexibility and tunability in manipulating light, contributing to the development of moiré physics for light. Here, we provide an overview on the state-of-art layered and stacked moiré metasurfaces. Freespace multifunctional metadevices are first discussed, followed by recent discoveries in polaritonics and twistronics for twisted hyperbolic metasurface bilayers. We conclude with a discussion on recent advances in the nanofabrication of moiré metasurfaces and remark on their future potential applications. Emerging Strategies for Advanced Optical Metasurfaces Using Twisting and StackingOptical metasurfaces (see Glossary), commonly recognized as the 2D counterpart of bulk metamaterials, are composed of subwavelength planarized inclusions [1,2]. Unlike metamaterials, metasurfaces usually have a thickness smaller than the operational wavelength in free space, holding the promise for next-generation multifunctional, compact, and integrated functional optical devices. Their ultrathin nature can significantly ease nanofabrication requirements compared with metamaterials, making them compatible for mass production in the semiconductor industry. One essential step in designing metasurfaces is to control light interactions with its local functional composites, so-called meta-atoms, thus enabling unprecedented control of the local scattering processes in terms of phase, amplitude, polarization, frequency, dispersion, and more [3][4][5][6]. In this way, a designer metasurface can be endowed with unprecedented control in tailoring the impinging light. This process inherently requires resonant light-matter interactions in meta-atoms, given the small light-matter interaction length. Tremendous efforts have been made in searching for better materials and novel metasurface designs for improved performance. For composite materials, metals can support enhanced photonic local density of states due to plasmonic phenomena, but may suffer from large Ohmic loss [7][8][9]. On the contrary, all-dielectric materials have significantly lower loss, but typically require a larger thickness, in the order of the wavelength in the material, limiting the field localization and enhancement of light-matter interactions [10]. Various geometries have been explored to realize metasurfaces, including split ring resonators, nanorods, and V-shape nanoantennas, supporting optical resonances in subwavelength meta-atoms [7,10]. These designs typically rely on heavy optimization techniques to obtain the best responses, requiring computational resources and tim...

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Magnons in a Quasicrystal: Propagation, Extinction, and Localization of Spin Waves in Fibonacci Structures

Cited by 40 publications

References 41 publications

Real space observation of magnon interaction with driven space-time crystals

Real space observation of magnon interaction with driven space-time crystals

An anomalous refraction of spin waves as a way to guide signals in curved magnonic multimode waveguides

Tailoring Light with Layered and Moiré Metasurfaces

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