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arxiv: 2506.10591 · v1 · submitted 2025-06-12 · ❄️ cond-mat.mes-hall · physics.app-ph

1D YIG hole-based magnonic nanocrystal

K. O. Levchenko , K. Dav\'idkov\'a , R. O. Serha , M. Moalic , A. A. Voronov , C. Dubs , O. Surzhenko , M. Lindner
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J. Panda Q. Wang O. Wojewoda B. Heinz M. Urb\'anek M. Krawczyk A. V. Chumak
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Pith reviewed 2026-05-19 09:51 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall physics.app-ph
keywords magnonic crystalsyttrium iron garnetspin wave propagationnanohole patterningband gap engineeringDamon-Eshbach geometryBrillouin light scattering
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The pith

Nanoholes in YIG films create one-dimensional magnonic crystals that transmit spin waves over 5 micrometers while forming band gaps with up to 26 dB rejection.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This work fabricates a one-dimensional magnonic nanocrystal by patterning nanoholes of about 150 nm diameter on a 1 micrometer pitch into a yttrium iron garnet film. Micro-focused Brillouin light scattering and propagating spin-wave spectroscopy, together with simulations, show that spin waves travel more than 5 micrometers in the Damon-Eshbach geometry. The periodic holes open clear band gaps that strongly attenuate certain frequencies, reaching rejection levels of 26 dB. Dispersion measurements reveal two anticrossings at 3.1 and 18.7 rad per micrometer; between these points the energy travels mainly through the n equals 2 mode, which accounts for the observed transmission. The results demonstrate how nanoscale periodic modulation can be used to control spin-wave propagation for potential magnonic devices.

Core claim

One-dimensional YIG magnonic crystals with nanoholes exhibit spin-wave transmission over 5 μm in the Damon-Eshbach configuration and pronounced band gaps with rejection levels up to 26 dB. The spin-wave dispersion features anticrossings at 3.1 and 18.7 rad/μm, with the n = 2 mode dominating energy transport between these points to enable efficient propagation.

What carries the argument

The periodic nanohole array in the YIG film that imposes a magnetic modulation creating the magnonic band structure and allowing selective mode propagation between anticrossings.

If this is right

  • Spin-wave signals can travel distances relevant for nanoscale magnonic circuits without excessive loss.
  • Band gaps provide frequency filtering with attenuation as high as 26 dB for unwanted modes.
  • The dominance of the n=2 mode between anticrossings opens a transmission window for device operation.
  • The approach supports scaling to two-dimensional magnonic nanoarrays for more complex functionalities.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Integration of such structures with microwave circuits could enable compact RF filters or delay lines based on spin waves.
  • Adjusting hole size or spacing might allow tuning the band gap positions for specific operating frequencies.
  • Similar nanohole patterning in other low-damping magnetic films could extend the technology to different temperature or frequency regimes.

Load-bearing premise

The nanoholes are patterned with high enough precision and uniformity, and with minimal damage to the surrounding magnetic material, to create a clean periodic modulation that produces the observed band gaps and transmission.

What would settle it

If spin-wave spectroscopy measurements show no transmission beyond 1 micrometer or absence of frequency ranges with 20 dB or higher rejection, the claim of effective magnonic crystal behavior would not hold.

read the original abstract

Magnetic media with artificial periodic modulation-magnonic crystals (MCs) - enable tunable spin-wave dynamics and band structure engineering. Nanoscaling enhances these capabilities, making magnonic nanocrystals promising for both fundamental studies and applications. Here, we report on the design, fabrication, and characterization of one-dimensional YIG MCs with nanoholes ($d \approx $ 150 nm) spaced $a \approx 1 \mu$m apart. Micro-focused Brillouin light scattering and propagating spin-wave spectroscopy, supported by TetraX and MuMax$^3$ simulations, reveal spin-wave transmission over 5 $\mu$m in the Damon-Eshbach configuration, and the formation of pronounced band gaps with rejection levels up to 26 dB. Detailed analysis of the spin-wave dispersion uncovered complex mode interactions, including two prominent anticrossings at 3.1 and 18.7 rad/$\mu$m, between which the spin-wave energy is predominantly carried by the $n$ = 2 mode, enabling efficient transmission. The results advance the development of functional MCs and open pathways toward 2D magnonic nanoarrays and magnonic RF nanodevices.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The paper claims to have fabricated and characterized one-dimensional YIG magnonic nanocrystals with a periodic array of nanoholes (d ≈ 150 nm, a ≈ 1 μm). Micro-focused Brillouin light scattering and propagating spin-wave spectroscopy, supported by TetraX and MuMax3 micromagnetic simulations, are reported to demonstrate spin-wave transmission over 5 μm in the Damon-Eshbach configuration together with band gaps reaching 26 dB rejection. Dispersion analysis identifies anticrossings at 3.1 and 18.7 rad/μm with dominant n = 2 mode transmission between them.

Significance. If the central claims hold, the work shows that nanohole-based periodic modulation in YIG can produce functional magnonic band structures at the nanoscale, with mode-selective propagation and substantial rejection levels. The combination of complementary experimental techniques and two independent simulation packages provides a concrete demonstration of complex mode interactions that could inform design of magnonic RF nanodevices and 2D nanoarrays.

major comments (2)
  1. [Fabrication and structural characterization] The central claim that the nanohole array produces intrinsic Bragg scattering and the observed anticrossings at 3.1 and 18.7 rad/μm (Abstract and dispersion analysis) rests on the assumption of uniform periodic magnetic modulation. The manuscript provides no quantitative verification such as hole-diameter histograms, edge-roughness RMS values, or statistics from SEM/AFM images spanning the full 5 μm transmission path, while the TetraX and MuMax3 simulations presuppose ideal cylindrical holes with perfect periodicity. Without these data it remains possible that local fabrication variations or ion-damage gradients account for the reported features rather than the intended magnonic crystal behavior.
  2. [Experimental results and dispersion analysis] The reported transmission over 5 μm and band-gap rejection levels up to 26 dB (Abstract and Results) are stated to be supported by BLS and PSS spectra, yet the text supplies neither error bars on the extracted intensities or frequencies, raw spectra, nor explicit data-selection criteria. This absence prevents independent assessment of the statistical significance of the n = 2 mode dominance and the precise locations of the anticrossings.
minor comments (2)
  1. [Abstract and dispersion figures] Ensure consistent use of wave-vector units (rad/μm) between the abstract, figures, and text; clarify whether the quoted values are wave numbers or angular wave numbers.
  2. [Simulation methods] Provide a brief statement on how the two micromagnetic codes (TetraX and MuMax3) were cross-validated for the same geometry and material parameters.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful and constructive review of our manuscript. We have addressed each major comment point by point below and will revise the manuscript accordingly to strengthen the presentation of fabrication uniformity and experimental data transparency.

read point-by-point responses

  1. Referee: [Fabrication and structural characterization] The central claim that the nanohole array produces intrinsic Bragg scattering and the observed anticrossings at 3.1 and 18.7 rad/μm (Abstract and dispersion analysis) rests on the assumption of uniform periodic magnetic modulation. The manuscript provides no quantitative verification such as hole-diameter histograms, edge-roughness RMS values, or statistics from SEM/AFM images spanning the full 5 μm transmission path, while the TetraX and MuMax3 simulations presuppose ideal cylindrical holes with perfect periodicity. Without these data it remains possible that local fabrication variations or ion-damage gradients account for the reported features rather than the intended magnonic crystal behavior.

    Authors: We agree that quantitative statistics on hole uniformity would provide stronger support for attributing the anticrossings and band gaps to the designed periodic modulation. In the revised manuscript we will include histograms of hole diameters and edge-roughness RMS values extracted from multiple SEM and AFM images acquired along the full 5 μm propagation path. These data will demonstrate that the fabricated structures maintain d ≈ 150 nm and a ≈ 1 μm with low variation, consistent with the observed mode-selective transmission. While the micromagnetic simulations use idealized geometries, their agreement with both BLS and PSS experiments supports that the reported features originate from the magnonic crystal rather than uncontrolled fabrication artifacts; ion-damage effects are minimized by the low-energy etching process used. revision: yes

  2. Referee: [Experimental results and dispersion analysis] The reported transmission over 5 μm and band-gap rejection levels up to 26 dB (Abstract and Results) are stated to be supported by BLS and PSS spectra, yet the text supplies neither error bars on the extracted intensities or frequencies, raw spectra, nor explicit data-selection criteria. This absence prevents independent assessment of the statistical significance of the n = 2 mode dominance and the precise locations of the anticrossings.

    Authors: We acknowledge that error bars, raw spectra, and explicit selection criteria are necessary for independent evaluation. In the revised manuscript we will add error bars to all extracted intensity and frequency values from both micro-focused BLS and propagating spin-wave spectroscopy. Representative raw spectra will be provided in the supplementary information, and we will explicitly state the criteria used to identify the n = 2 mode dominance and to locate the anticrossings at 3.1 and 18.7 rad/μm. These additions will allow readers to assess the statistical significance of the 5 μm transmission and the 26 dB rejection levels. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental spectra and independent micromagnetic simulations are self-contained

full rationale

The paper reports direct experimental observations of spin-wave transmission and band gaps via micro-focused Brillouin light scattering and propagating spin-wave spectroscopy in fabricated YIG nanohole arrays, with supporting results from standard, externally validated codes (TetraX and MuMax3). No derivation chain, equations, or first-principles predictions are presented that reduce reported quantities to fitted inputs or self-citations by construction. The central claims rest on measured dispersion relations, transmission data, and mode analysis that can be independently reproduced or falsified from the raw spectra and simulation inputs without tautological reduction to the paper's own fitted parameters.

Axiom & Free-Parameter Ledger

2 free parameters · 1 axioms · 0 invented entities

The central claims rest on standard magnonic assumptions about surface spin-wave geometry and on fabrication parameters chosen to match the target periodicity; no new entities are postulated.

free parameters (2)
  • hole diameter d = ~150 nm
    Approximate design value (~150 nm) that defines the periodic perturbation strength and must be realized in fabrication.
  • lattice spacing a = ~1 μm
    Chosen periodicity (~1 μm) that sets the Brillouin zone boundaries and band-gap locations.
axioms (1)
  • domain assumption Damon-Eshbach geometry produces the observed surface spin-wave dispersion in the YIG film
    Invoked when stating transmission and mode analysis in the abstract.

pith-pipeline@v0.9.0 · 5812 in / 1524 out tokens · 39189 ms · 2026-05-19T09:51:57.023695+00:00 · methodology

discussion (0)

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