Strongly localized modes in one-dimensional defect-free magnonic quasicrystals

Chen, C. H.; Qiu, R.Z.; Chang, Ching-Hung; Hsueh, Wen–Jeng

doi:10.1063/1.4892164

Cited by 8 publications

(5 citation statements)

References 29 publications

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“…One dimensional (1D) magnonic crystals (MCs) for controlling the propagation of spin waves (SWs) have been widely studied and reviewed [1][2][3][4][5][6][7][8][9][10][11][12][13], primarily because of the unique properties of such crystals, e.g., the guiding and filtering of SWs [14][15][16][17], confinement of SWs [18][19][20][21], and slowing (phase shifting) of SWs. MCs are based on phase interference of SWs, and many applications have been proposed or are in development based on the advantages of MCs for controlling SWs.…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Magnonic Crystal With Cu Stripes for Forward Volume Spin Waves

et al. 2019

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A one-dimensional magnonic crystal for forward volume spin waves (FV SWs) is demonstrated using eight pairs of Cu stripes fabricated on a 1-mm wide × 14-mm long × 10.2-µm thick yttrium iron garnet (YIG) waveguide and a SW absorber of 30-nm-thick Au film. The development of this crystal is challenging due to strong spectral oscillations caused by edge reflections and process difficulties associated with YIG magnonic crystals. A magnonic band gap with a depth of −4.6 dB is observed at a frequency of 1.80 GHz for a FV SW excited by a 50-µm-wide microstrip line, which is in good agreement with simulation results using three-dimensional modeling in the radio frequency region. The obtained performance is illustrated by plotting the depth of the respective band gaps vs the pair number of the stripes. This value is compared with that obtained in previous studies.

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Section: Introductionmentioning

confidence: 99%

One-Dimensional Magnonic Crystal With Cu Stripes for Forward Volume Spin Waves

et al. 2019

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“…For spin waves of longer wavelength, the same magnonic crystal will represent an effectively continuous medium with properties defined not only by those of the constituent magnetic materials but also details of the geometrical and micromagnetic structure. Magnonic crystals therefore represent a class of metamaterials, often referred to as "magnonic metamaterials", [73][74][75][76][77][78] which also includes systems that are not periodic, such as magnonic quasi-crystals [79][80][81][82][83][84][85] and (when considered from the point of view of their dynamic properties) magnetic composites. [86][87][88][89][90][91][92][93] The nature of the interlayer magnetization boundary conditions has crucial consequences for the scattering of spin waves from interfaces between regions with different magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Formation of the band spectrum of spin waves in 1D magnonic crystals with different types of interfacial boundary conditions

Kruglyak¹,

Davies²,

Tkachenko³

et al. 2017

J. Phys. D: Appl. Phys.

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We report a theoretical study of the spin-wave band spectrum of magnonic crystals formed by stacking thin-film magnetic layers, with general assumptions about the properties of the interfaces between the layers. The use of the Barnaś-Mills magnetization boundary conditions has enabled us to systematically trace the origin of the magnonic band gaps in the spin-wave spectrum of such systems. We find that the band gaps are a ubiquitous attribute of a weakened interlayer coupling and a finite interface anisotropy (pinning). The band gaps in such systems represent a legacy of the discrete spinwave spectrum of the individual magnetic layers periodically stacked to form the magnonic crystal rather than result from Bragg scattering. At the same time, magnonic crystals with band gaps due to the Bragg scattering can be described by natural boundary conditions (i.e. those maintaining continuity of the magnetization direction across the whole sample). We generalize our conclusions to systems beyond thin-film magnonic crystals and propose magnonic crystals based on the ideas of graded-index magnonics and those formed by Fano resonances as a possible way to circumvent the discovered issues.

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“…Their role was also discussed as static defects, deliberately introduced into the photonic quasicrystals [17]. In the paper, we focus on the general problem of proper introduction of positional disorder in magnonic quasicrystals and study the impact of such phasonic defects on the spin-wave spectra and their localization properties in magnonic Fibonacci quasicrystals [18,19]. We introduce the static and spatially uncorrelated phasonic defects, which allows for gradual transition from non-defected Fibonacci sequence of strips to the completely disordered system.…”

Section: Introductionmentioning

confidence: 99%

Spin-wave localization on phasonic defects in one-dimensional magnonic quasicrystal

Mieszczak,

Krawczyk,

Kłos

2022

Preprint

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We report on the evolution of the spin-wave spectrum under induced structural disorder in onedimensional magnonic quasicrystal. We study theoretically a system composed of ferromagnetic strips arranged in a Fibonacci sequence for several stages of disorder in the form of phasonic defects, where different rearrangements are introduced. By transition from the quasiperiodic order towards disorder, we show a gradual degradation of the fine fractal spectra of spin-waves, and the evolution of the band gaps. The analysis shows the mode localization evolution, which is an inevitable property of the quasicrystals. In particular, significant enhancement of the spin-wave mode localization and disappearing of the van Hove singularities at the band gap edges with increasing number of defects can be indication of the phasonic defects existing in the structure. This work fills gap in the knowledge of defected magnonic Fibonacci quasicrystals and opens the way to the study of the phasonic defect in two-dimensional magnonic quasicrystals.

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Strongly localized modes in one-dimensional defect-free magnonic quasicrystals

Cited by 8 publications

References 29 publications

One-Dimensional Magnonic Crystal With Cu Stripes for Forward Volume Spin Waves

One-Dimensional Magnonic Crystal With Cu Stripes for Forward Volume Spin Waves

Formation of the band spectrum of spin waves in 1D magnonic crystals with different types of interfacial boundary conditions

Spin-wave localization on phasonic defects in one-dimensional magnonic quasicrystal

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