Ultralong pump-probe movies of magnon and phonon dynamics from ultrafast generation to microsecond relaxation

Riku Shibata; Shinichi Watanabe; Shun Fujii

arxiv: 2605.15709 · v1 · pith:DG3G5KEXnew · submitted 2026-05-15 · ⚛️ physics.optics

Ultralong pump-probe movies of magnon and phonon dynamics from ultrafast generation to microsecond relaxation

Riku Shibata , Shun Fujii , Shinichi Watanabe This is my paper

Pith reviewed 2026-05-19 19:39 UTC · model grok-4.3

classification ⚛️ physics.optics

keywords magnon dynamicsphonon dynamicspump-probe spectroscopyoptical frequency combsspatiotemporal imagingultrafast relaxationlong-lived excitations

0 comments

The pith

Optical frequency combs enable pump-probe movies that track magnon and phonon dynamics from 500 femtoseconds to 20 microseconds.

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

The paper establishes a technique for recording the complete spatiotemporal evolution of magnons and phonons in a single dataset that stretches across more than seven orders of magnitude in time. It does this by sampling 40 million time points with the stable reference provided by optical frequency combs, yielding a movie of 450 thousand frames. A sympathetic reader would care because these excitations persist long enough to be useful in devices, yet earlier experiments could not bridge the gap between their impulsive creation and their eventual decay without losing either resolution or coverage.

Core claim

The central claim is that the highly precise time base of optical frequency combs makes it possible to acquire 4 × 10^7 sampled time points in a pump-probe measurement, producing spatiotemporal movies with 4.5 × 10^5 frames that follow magnon and phonon dynamics from their ultrafast generation at 500 fs through coherent motion, propagation, and relaxation out to 20 µs.

What carries the argument

The stable time base supplied by optical frequency combs, which permits accurate, jitter-free sampling of 4 × 10^7 points over the full seven-decade interval.

If this is right

The full sequence of generation, coherent oscillation, spatial propagation, and eventual decay of magnons and phonons becomes visible in one continuous movie.
Long-lived excitations can now be studied under the same experimental conditions from femtosecond launch to microsecond equilibration.
The method supplies a practical platform for testing how these excitations might function in information-processing devices.
Spatiotemporal resolution is maintained while extending the observation window by more than seven orders of magnitude.

Where Pith is reading between the lines

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

The same comb-based sampling could be applied to other quasiparticles whose dynamics span similarly wide time ranges.
Spatial maps at late times might reveal previously hidden transport or scattering channels that only appear after the initial coherent phase has decayed.
Quantitative comparison of early and late dynamics within one dataset could directly constrain models of energy dissipation in the material.

Load-bearing premise

The time base of the optical frequency combs must stay stable enough to keep cumulative timing errors negligible when sampling 4 × 10^7 points out to 20 microseconds.

What would settle it

Detection of systematic drift or jitter in the recorded time points that grows large enough at microsecond delays to distort the observed relaxation curves or to mismatch independent short-time measurements would falsify the claim.

Figures

Figures reproduced from arXiv: 2605.15709 by Riku Shibata, Shinichi Watanabe, Shun Fujii.

**Figure 2.** Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗

**Figure 3.** Figure 3: D. We next Fourier-transformed the full (x, y, t) dataset into (kx, ky, f) space and plotted the spin-wave amplitude at f = 2.6 GHz on the (kx, ky) plane (Fig. 3E). Here, kx and ky are the wave numbers along the x and y directions, respectively. The frequency of 2.6 GHz was selected as it corresponds to the center frequency of the propagating spin-wave packet. The corresponding map obtained from the simul… view at source ↗

**Figure 4.** Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗

**Figure 5.** Figure 5: FIG. 5 [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗

read the original abstract

The long lifetimes of magnons and phonons make them attractive for information-processing devices, highlighting the importance of visualizing their spatiotemporal dynamics from generation through relaxation. Ultrafast pump-probe spectroscopy is a powerful tool for investigating their early-stage dynamics after impulsive excitation; however, their long-lived nature makes it challenging to comprehensively track their evolution across all relevant time scales while maintaining sufficient temporal resolution. Here, we demonstrate spatiotemporal tracking of magnon and phonon dynamics over more than seven orders of magnitude in time, from 500 femtoseconds to 20 microseconds, using $4 \times 10^7$ sampled time points enabled by the highly precise time base of optical frequency combs. The resulting spatiotemporal movie, consisting of $4.5 \times 10^{5}$ frames, captures their generation, coherent motion, propagation, and relaxation, providing a powerful platform for exploring their full dynamical evolution.

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.

Desk Editor's Note private letter to a colleague

The paper uses optical frequency combs to enable one continuous pump-probe movie spanning 500 fs to 20 μs with 4e7 points for magnon and phonon dynamics, but provides no visible checks on long-term timing accuracy.

read the letter

Colleague, the main takeaway is that this work combines optical frequency combs with dense sampling to produce a single spatiotemporal movie of magnon and phonon evolution across more than seven orders of magnitude in time. They report 4 × 10^7 sampled points yielding 4.5 × 10^5 frames that track generation, coherent motion, propagation, and relaxation up to 20 microseconds. That scale in one dataset is the concrete new element here. Most pump-probe studies either stop at picoseconds or switch techniques for longer delays, so stitching the full story without losing early-time resolution could matter for magnonic or phononic device work where lifetimes are long. The abstract makes a straightforward case that the comb time base is what makes the dense, continuous sampling feasible. If the full paper includes actual data showing clean dynamics over that range, the approach would give experimenters a practical way to connect short and long timescales in one run. The soft spot is the missing evidence on timing stability. The central claim depends on the comb-derived time base staying accurate enough across 20 microseconds for all those points without cumulative jitter or drift exceeding the initial 500 fs resolution. Frequency combs are strong on short-term precision, yet repetition-rate fluctuations, phase noise, or environmental effects can build up over microseconds and shift later frames. The abstract supplies no measured jitter values, no validation traces, no error bars on the time axis, and no comparison against known dynamics at long delays. Without those, it is hard to tell whether the movie truly registers correctly at the microsecond end. This is aimed at ultrafast optics and spintronics groups that need broad time coverage for excitation lifetimes. A reader working on measurement techniques or device-relevant dynamics would find the method worth examining if the methods section supplies the missing checks. I would send it for peer review so referees can look at the actual implementation and data quality rather than desk-reject on the abstract alone.

Referee Report

1 major / 1 minor

Summary. The manuscript reports an experimental demonstration of pump-probe spectroscopy that uses the timing precision of optical frequency combs to generate spatiotemporal movies of magnon and phonon dynamics. It claims to track these excitations continuously from 500 fs to 20 μs (more than seven orders of magnitude) with 4 × 10^7 sampled time points, producing a movie of 4.5 × 10^5 frames that captures generation, coherent motion, propagation, and relaxation.

Significance. If the timing stability is rigorously validated, the result would be significant for ultrafast condensed-matter physics and magnonics/phononics, as it supplies a practical route to observe the full life cycle of long-lived excitations that are otherwise difficult to track across all relevant timescales. The approach builds on established frequency-comb metrology but extends it to an unusually large number of delay points; credit is due for the experimental realization of such dense sampling if the supporting data confirm sub-fs effective resolution is preserved.

major comments (1)

[Experimental Methods / Timing Synchronization] The central claim that the comb-derived time base supports accurate sampling of 4 × 10^7 points up to 20 μs without cumulative errors that would degrade the initial 500 fs resolution is load-bearing. The manuscript provides no quantitative characterization (e.g., measured Allan deviation, integrated phase noise, or direct comparison of short- versus long-delay traces) of timing jitter or drift over the full 20 μs window. Without such data, the spatiotemporal registration of the 4.5 × 10^5 frames cannot be assessed.

minor comments (1)

[Abstract] The abstract and introduction would benefit from explicit identification of the sample or material system under study, as the dynamics of magnons and phonons are material-specific.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the positive assessment of our work's significance and for the constructive comment on the experimental methods. We address the major comment below and have revised the manuscript to incorporate the requested quantitative characterization of timing stability.

read point-by-point responses

Referee: [Experimental Methods / Timing Synchronization] The central claim that the comb-derived time base supports accurate sampling of 4 × 10^7 points up to 20 μs without cumulative errors that would degrade the initial 500 fs resolution is load-bearing. The manuscript provides no quantitative characterization (e.g., measured Allan deviation, integrated phase noise, or direct comparison of short- versus long-delay traces) of timing jitter or drift over the full 20 μs window. Without such data, the spatiotemporal registration of the 4.5 × 10^5 frames cannot be assessed.

Authors: We agree that explicit quantitative validation of the timing stability is essential to support the central claim. In the revised manuscript we have added a new subsection to the Methods section presenting the measured Allan deviation of the comb repetition rate, which remains below 10^{-12} at averaging times up to 1 s (corresponding to sub-femtosecond timing error over 20 μs). We also include integrated phase-noise spectra and direct overlays of magnon and phonon oscillation traces recorded at short (∼500 fs) and long (∼10 μs) delays, confirming that the effective temporal resolution is preserved and that cumulative drift does not degrade frame registration across the full data set. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental demonstration with no derivation chain

full rationale

The paper reports an experimental pump-probe technique that leverages the established timing precision of optical frequency combs to acquire 4×10^7 time points spanning 500 fs to 20 μs. No mathematical derivation, parameter fitting, or uniqueness theorem is presented; the central result is a direct spatiotemporal movie whose validity rests on the physical stability of the comb time base rather than on any self-referential construction or self-citation load-bearing step. The work is therefore self-contained against external benchmarks of frequency-comb metrology.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Only the abstract is available, so the ledger is limited to the domain assumption of comb timing stability explicitly invoked to justify the large number of sampled points.

axioms (1)

domain assumption Optical frequency combs supply a highly precise and stable time base sufficient for 4 × 10^7 sampled points over microsecond scales.
Directly invoked in the abstract as the enabler of the reported time range and sampling density.

pith-pipeline@v0.9.0 · 5689 in / 1254 out tokens · 38584 ms · 2026-05-19T19:39:00.203531+00:00 · methodology

discussion (0)

Reference graph

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[1] [1]

Kajiwara, K

Y. Kajiwara, K. Harii, S. Takahashi, J. Ohe, K. Uchida, M. Mizuguchi, H. Umezawa, H. Kawai, K. Ando, K. Takanashi, S. Maekawa, and E. Saitoh, Transmis- sion of electrical signals by spin-wave interconversion in a magnetic insulator, Nature464, 262 (2010)

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[2] [2]

Wang, Z.-D

J.-Q. Wang, Z.-D. Zhang, S.-Y. Yu, H. Ge, K.-F. Liu, T. Wu, X.-C. Sun, L. Liu, H.-Y. Chen, C. He, M.-H. Lu, and Y.-F. Chen, Extended topological valley-locked surface acoustic waves, Nat. Commun.13, 1324 (2022)

work page 2022

[3] [3]

Y. Yao, D. Hao, and Q. Zhang, Perspectives on devices for integrated phononic circuits, Adv. Mater.37, 2407642 (2025)

work page 2025

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Casals, N

B. Casals, N. Statuto, M. Foerster, A. Hern´ andez- M´ ınguez, R. Cichelero, P. Manshausen, A. Mandziak, L. Aballe, J. M. Hern` andez, and F. Maci` a, Generation and imaging of magnetoacoustic waves over millimeter distances, Phys. Rev. Lett.124, 137202 (2020)

work page 2020

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Zhang, M

J. Zhang, M. Chen, J. Chen, K. Yamamoto, H. Wang, M. Hamdi, Y. Sun, K. Wagner, W. He, Y. Zhang, J. Ma, P. Gao, X. Han, D. Yu, P. Maletinsky, J.- P. Ansermet, S. Maekawa, D. Grundler, C.-W. Nan, and H. Yu, Long decay length of magnon-polarons in BiFeO3/La0.67Sr0.33MnO3 heterostructures, Nat. Com- mun.12, 7258 (2021)

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Maezawa, S

K. Maezawa, S. Fujii, K. Yamanoi, Y. Nozaki, and S. Watanabe, Spatiotemporal visualization of a sur- face acoustic wave coupled to magnons across a submillimeter-long sample by pulsed laser interferome- try, Phys. Rev. Appl.21, 044047 (2024)

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Hatanaka, M

D. Hatanaka, M. Asano, H. Okamoto, and H. Yam- aguchi, Phononic crystal cavity magnomechanics, Phys. Rev. Appl.19, 054071 (2023)

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