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arxiv: 2605.29597 · v1 · pith:BGJGXBKNnew · submitted 2026-05-28 · ❄️ cond-mat.mes-hall · cond-mat.mtrl-sci

Disentangling Spin Pumping and Two-Magnon Scattering Contributions to Gilbert Damping in YIG/V Bilayers

S. Elkady , A. Tlais , H. Reslan , S. Isber , M. Haidar This is my paper

Pith reviewed 2026-06-29 05:52 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall cond-mat.mtrl-sci
keywords spin pumpingtwo-magnon scatteringGilbert dampingYIG/V bilayersspin-mixing conductanceferromagnetic resonancemagnetic relaxation
0
0 comments X

The pith

Neglecting two-magnon scattering in YIG/V bilayers overestimates spin-pumping contributions and produces unphysically large spin-mixing conductance.

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

The paper measures Gilbert damping in YIG/V bilayers as a function of YIG thickness using broadband ferromagnetic resonance. It finds that the observed thickness dependence cannot be explained by spin pumping alone. Instead, two-magnon scattering accounts for most of the variation in the nanometer regime. A model that includes both mechanisms shows that ignoring two-magnon scattering inflates the extracted spin-mixing conductance to unrealistic values. After separation, the intrinsic spin-pumping term yields a thickness-independent effective spin-mixing conductance of 1.33 × 10^18 m^{-2}.

Core claim

In YIG/V bilayers the apparent enhancement of Gilbert damping with decreasing YIG thickness arises mainly from two-magnon scattering rather than spin pumping. A thickness-dependent damping model that incorporates both contributions disentangles the relaxation channels and isolates an intrinsic spin-pumping term, producing a thickness-independent effective spin-mixing conductance of 1.33 × 10^18 m^{-2}.

What carries the argument

Thickness-dependent damping model that separates spin-pumping and two-magnon scattering contributions to Gilbert damping.

If this is right

  • Neglecting two-magnon scattering produces spin-mixing conductance values that exceed physically plausible limits.
  • The extracted effective spin-mixing conductance remains constant across YIG thicknesses once two-magnon scattering is removed.
  • Extrinsic damping channels must be subtracted before interpreting inverse spin Hall effect data in FM/HM bilayers.
  • The same separation procedure applies to other ferromagnetic/heavy-metal interfaces where thickness-dependent damping appears.

Where Pith is reading between the lines

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

  • Similar overestimation of spin-mixing conductance is likely in other FM/NM systems when thickness series are analyzed without an explicit two-magnon term.
  • Experiments that vary interface quality while holding thickness fixed could test whether two-magnon scattering strength tracks interface roughness.
  • Extending the model to include temperature dependence would reveal whether the extracted conductance remains constant under thermal variation.

Load-bearing premise

The thickness-dependent damping model used to separate the two mechanisms is complete and contains no significant unaccounted relaxation channels in the nanometer regime.

What would settle it

A direct measurement of the inverse spin Hall voltage in the same YIG/V samples that yields a spin-mixing conductance consistent with 1.33 × 10^18 m^{-2} rather than the larger values obtained when two-magnon scattering is ignored.

Figures

Figures reproduced from arXiv: 2605.29597 by A. Tlais, H. Reslan, M. Haidar, S. Elkady, S. Isber.

Figure 1
Figure 1. Figure 1: FIG. 1. (Color online) (a) Schematic illustration of the broadband ferromagnetic resonance (B-FMR) mea [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. (Color online) Frequency dependence of the FMR linewidth for bare YIG films (blue squares) and [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. (Color online) (a) Thickness dependence of the extracted Gilbert damping parameter for bare YIG [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. (Color online) Dependence of the effective spin-mixing conductance on the YIG film thickness. [PITH_FULL_IMAGE:figures/full_fig_p011_4.png] view at source ↗
read the original abstract

In this work, we investigate the magnetic damping and spin pumping response of YIG-based bilayers incorporating vanadium (V) as the normal metal layer via broadband ferromagnetic resonance (FMR) measurements as a function of YIG thickness. We show that the apparent enhancement of the Gilbert damping in YIG/V bilayers cannot be solely attributed to spin pumping. Instead, two-magnon scattering (TMS) plays a dominant role in governing the thickness dependence of the damping in the nanometer regime. By applying a thickness-dependent damping model that accounts for both spin pumping and two-magnon scattering contributions, we successfully disentangle the different relaxation contributions. Our analysis reveals that neglecting two-magnon scattering leads to an overestimation of the spin-pumping contribution and consequently to unphysically large values of the effective spin-mixing conductance. After isolating the intrinsic spin pumping contribution, we extract a thickness-independent effective spin-mixing conductance of $g^{\uparrow\downarrow}_{\mathrm{eff}} = 1.33 \times 10^{18}~\mathrm{m^{-2}}$. These findings provide a more accurate framework for quantifying spin transport parameters in FM/HM systems and emphasize the necessity of accounting for extrinsic damping mechanisms when interpreting spin pumping and inverse spin Hall effect experiments.

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

1 major / 2 minor

Summary. The manuscript reports broadband FMR measurements of Gilbert damping versus YIG thickness in YIG/V bilayers. It claims that the observed thickness dependence cannot be explained by spin pumping alone and that two-magnon scattering (TMS) dominates in the nanometer regime. Application of a combined thickness-dependent model separates the ~1/t spin-pumping term from TMS, yielding a thickness-independent effective spin-mixing conductance g↑↓_eff = 1.33 × 10^18 m^{-2} and showing that omission of TMS produces unphysically large conductance values.

Significance. If the separation holds, the work supplies a practical correction procedure for extracting reliable spin-transport parameters from damping data in FM/NM bilayers and demonstrates the quantitative impact of neglecting TMS. The explicit test of the “TMS omitted” case and the resulting constant g_eff are useful strengths.

major comments (1)
  1. [Abstract and model-application section] Abstract and the section describing the model fit to the thickness series: the claim of successful disentanglement and extraction of a constant g_eff rests on the quality of the fit, yet no R² values, residual plots, error bars on the fitted parameters, data-exclusion criteria, or independent cross-check of the TMS term (e.g., via angular dependence or temperature) are supplied. These omissions are load-bearing for the central numerical result.
minor comments (2)
  1. [Introduction or Methods] Notation for the extracted conductance is introduced only in the abstract; a clear definition (including any assumptions about interface transparency or spin-memory loss) should appear in the main text before the numerical value is quoted.
  2. [Experimental section] The thickness range and number of samples used in the FMR series are not stated; this information is needed to judge the leverage of the 1/t term versus the TMS term.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive comment and for recognizing the potential utility of the disentanglement procedure. We address the single major comment below.

read point-by-point responses

  1. Referee: [Abstract and model-application section] Abstract and the section describing the model fit to the thickness series: the claim of successful disentanglement and extraction of a constant g_eff rests on the quality of the fit, yet no R² values, residual plots, error bars on the fitted parameters, data-exclusion criteria, or independent cross-check of the TMS term (e.g., via angular dependence or temperature) are supplied. These omissions are load-bearing for the central numerical result.

    Authors: We agree that quantitative indicators of fit quality are necessary to support the central claim. In the revised manuscript we will add the R² value of the combined TMS + spin-pumping fit, residual plots versus YIG thickness, and error bars (with 95 % confidence intervals) on all fitted parameters, including the reported g↑↓_eff. We will also state explicitly that every measured data point was retained and that no exclusion criteria were applied. Regarding independent cross-checks, the present dataset consists of broadband FMR measurements performed at room temperature and fixed in-plane field orientation; additional angular- or temperature-dependent measurements were not performed. The thickness-dependent model itself follows the established TMS formalism of Arias and Mills, and the internal consistency check (constant g_eff after TMS subtraction versus unphysically large values when TMS is omitted) is already shown in the manuscript. We therefore view the requested statistical diagnostics as sufficient to address the concern for a minor revision. revision: partial

Circularity Check

0 steps flagged

No significant circularity identified

full rationale

The paper applies a thickness-dependent damping model to broadband FMR data across YIG thicknesses, separates spin-pumping (~1/t) from TMS contributions, and extracts a constant g↑↓_eff by fitting. This is standard parameter extraction from measurements rather than any reduction by the paper's own equations to a self-defined quantity, a fitted input renamed as prediction, or a self-citation chain. No load-bearing uniqueness theorem, ansatz smuggling, or renaming of known results occurs. The extracted value is independent of prior fitted parameters within the work and remains falsifiable against external data.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The central claim rests on the validity of the combined damping model and the assumption that all relevant thickness-dependent mechanisms are captured by the two terms included.

free parameters (1)
  • effective spin-mixing conductance = 1.33 × 10^18 m^{-2}
    Thickness-independent parameter extracted by fitting the model to the measured damping versus thickness data.
axioms (1)
  • domain assumption The thickness-dependent damping model correctly accounts for both spin pumping and two-magnon scattering without significant omissions.
    Invoked when the abstract states the model is applied to disentangle contributions and isolate the spin-pumping term.

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