Lattice Vibration, Raman Modes and Room-Temperature Spin-Phonon Coupling in Intrinsic 2D van der Waals Ferromagnetic Fe3GaTe2

Bichen Xiao; Gaojie Zhang; Haixin Chang; Hao Wu; Li Yang; Wenfeng Zhang; Wen Jin

REVIEW 3 major objections 6 minor 8 references

Lattice Vibration, Raman Modes and Room-Temperature Spin-Phonon Coupling in Intrinsic 2D van der Waals Ferromagnetic Fe3GaTe2

T0 review · 3 major / 6 minor · reviewed 2026-08-12 · deepseek-v4-flash

Challenge this review Re-run · record.json Download PDF Read on arXiv ↗ Review JSON

Pith's one-line read Fe3GaTe2 shows measurable spin-phonon coupling at 300 K, with a strength of about 0.28 cm$^{-1}$.

desk verdict Plausible first room-temperature spin-phonon coupling in Fe3GaTe2, but the quoted lambda rests on an unreported anharmonic fit and an asserted spin correlation. read the letter →

arxiv 2411.19533 v1 pith:YFNMO5FI submitted 2024-11-29 cond-mat.mtrl-sci

Gaojie Zhang , Hao Wu , Li Yang , Wen Jin , Bichen Xiao , Wenfeng Zhang , Haixin Chang This is my paper · ORCID

classification cond-mat.mtrl-sci

keywords Two-dimensionalvanderWaalsmagnetsFe3GaTe2Room-temperatureferromagnetismLatticevibrationsRamanmodesSpin-phononcouplingAnharmonicmodelPhonondispersions

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This paper reports the first experimental evidence of room-temperature spin-phonon coupling in a two-dimensional van der Waals magnet. The material, Fe3GaTe2, is a layered ferromagnet with a Curie temperature near 366 K, and the paper identifies two out-of-plane Raman-active phonon modes whose frequencies rise as the crystal is thinned. Below the magnetic transition, the frequency of the stronger mode departs from the standard anharmonic model, and that departure is converted into a spin-phonon coupling strength of about 0.28 cm$^{-1}$ at 300 K. If correct, the result brings spin-lattice interactions in 2D magnets into the room-temperature range relevant for spintronic devices.

What carries the argument

The load-bearing relationship is $\Delta\omega_p(T) = \omega_p(T) - \omega_{\rm anh}(T) = \lambda\langle S_i\cdot S_j\rangle$, where $\omega_p(T)$ is the measured A$_{1g}^{2}$ phonon frequency, $\omega_{\rm anh}(T)$ is the frequency predicted by the anharmonic model $\omega_{\rm anh}(T)=\omega_p(0)-A[1+2/(e^{\hbar\omega_p(0)/2k_BT}-1)]$, and $\langle S_i\cdot S_j\rangle$ is the nearest-neighbor spin correlation. The anharmonic model supplies the nonmagnetic baseline; the deviation below the Curie temperature is attributed to spin-phonon coupling. Supporting machinery includes first-principles phonon calculations under ferromagnetic versus nonmagnetic interlayer spin ordering and temperature-dependent Raman spectroscopy on encapsulated flakes.

What would settle it

Measure the A$_{1g}^{2}$ phonon frequency of Fe3GaTe2 from above $T_C$ down to low temperature while applying a magnetic field: if the deviation from the anharmonic model persists in the paramagnetic phase or does not track the magnetization below $T_C$, the attribution to spin-phonon coupling would be undermined. Alternatively, an independent measurement of $\langle S_i\cdot S_j\rangle$ (for example by neutron scattering) that differs from 0.51 would rescale $\lambda$ and could move it outside the claimed range.

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Extended reading notes

Core claim

The paper establishes that Fe3GaTe2 exhibits spin-phonon coupling at room temperature. Two Raman modes with out-of-plane atomic displacements, labeled A$_{1g}^{1}$ and A$_{1g}^{2}$, are observed in flakes from 143 nm down to 8 nm, and their frequencies increase with decreasing thickness because interlayer van der Waals and spin-exchange coupling weaken. First-principles phonon dispersions computed with ferromagnetic interlayer spin ordering are shifted to lower frequencies compared with nonmagnetic ordering, indicating spin-phonon coupling. Experimentally, the temperature dependence of the A$_{1g}^{2}$ mode frequency deviates from an anharmonic model below the Curie temperature; writing the deviation as $\Delta\omega_p = \lambda\langle S_i\cdot S_j\rangle$ and estimating the nearest-neighbor spin correlation from the measured magnetization gives $\lambda \approx 0.28$ cm$^{-1}$ at 300 K, claimed as the first experimental identification of room-temperature spin-phonon coupling in a 2D van der Waals magnet.

Load-bearing premise

The conversion from measured magnetization to the nearest-neighbor spin correlation $\langle S_i\cdot S_j\rangle \approx 0.51$ is assumed without a derived justification, and the quoted coupling strength changes in inverse proportion to that assumed value.

Editorial extensions

If this is right

Fe3GaTe2 becomes a platform for studying and exploiting spin-phonon coupling at and above room temperature in two-dimensional magnets.
Raman spectroscopy can serve as a local probe of magnetic order in this material, since the phonon frequency visibly departs from the anharmonic baseline below $T_C$.
The thickness-dependent Raman shift implies that interlayer spin exchange coupling contributes to the effective interlayer bonding, so Raman can monitor changes in magnetic interlayer coupling in thin flakes.
Natural oxidation of Fe3GaTe2 produces distinct Raman peaks, meaning encapsulation is needed for reliable vibrational studies and Raman can fingerprint sample degradation.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

Extension: The reported $\lambda$ scales inversely with the assumed spin correlation $\langle S_i\cdot S_j\rangle \approx 0.51$; an independent measurement of spin correlations would refine the coupling strength without changing the qualitative conclusion.
Extension: If the coupling is intrinsic, a magnetic field applied near $T_C$ should tune the phonon frequency through the magnetization; this is a testable prediction the paper does not perform.
Extension: The same anharmonic-deviation protocol could be applied to other above-room-temperature van der Waals ferromagnets to test whether room-temperature spin-phonon coupling is a general feature of this materials class.
Extension: Because the coupling persists at 300 K, phonon-driven spin transport effects such as the spin Seebeck effect become conceivable in Fe3GaTe2-based devices at room temperature, though the paper does not measure transport of that kind.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Desk Editor's Note

read the letter

The real news here is the claim: first experimental spin-phonon coupling in a 2D van der Waals magnet at room temperature, with a coupling strength of ~0.28 cm^-1 in Fe3GaTe2. That is a meaningful milestone for the 2D spintronics crowd, even if it does not reshape the field. The paper earns credit for the supporting package: careful crystal growth, hBN encapsulation to avoid oxidation, thickness-dependent Raman data that track the DFT trend, and phonon dispersions computed for ferromagnetic versus nonmagnetic interlayer ordering. The FM-versus-NM phonon shifts are a genuine, independent fingerprint of spin-phonon coupling, so the qualitative conclusion is not resting on one wobbly residual alone.

The soft spot is exactly where the stress-test note lands. The anharmonic fit in Figure 6e is shown as a red dash, but the fitting temperature window, the fitted omega_p(0) and A, and the residuals are never given. The claim then hinges on a 0.143 cm^-1 deviation at 300 K, which is comparable to the N=3 scatter visible in the figure and to typical Raman peak-fitting error. Without a statistical test or at least a plot of residuals with propagated uncertainties, that deviation could plausibly be noise. The conversion to lambda also depends on an assumed ≈ 0.51, stated in one line without derivation; since lambda = Delta_omega / , a different reasonable spin correlation would shift the headline number substantially.

These are not fatal flaws. They are missing details, and the central argument — that spin-phonon coupling exists and becomes visible below TC — is supported by the DFT phonon comparison. But as written, the quantitative lambda is not robust. The paper needs a referee, not a desk reject, and the referee should insist on the fit provenance, a noise floor estimate, and a transparent derivation or citation for the spin correlation.

Who gets value: anyone working on Fe3GaTe2 or room-temperature 2D magnets. Cite it for the observation and the DFT result, but not yet for the precise coupling strength. I would send it to peer review with a request for major revision before acceptance.

Referee Report

3 major / 6 minor

Summary. The manuscript reports a combined experimental and first-principles study of lattice vibrations and Raman modes in the room-temperature ferromagnetic van der Waals material Fe3GaTe2. The authors identify two A1g Raman modes, observe thickness-dependent frequency shifts, and present phonon band-structure calculations with ferromagnetic versus nonmagnetic interlayer ordering. The central claim is that the A1g^2 mode frequency deviates from a Klemens-type anharmonic model below the Curie temperature, yielding a spin-phonon coupling strength λ ≈ 0.28 cm^-1 at 300 K, which they describe as the first experimental identification of room-temperature spin-phonon coupling in 2D vdW magnets.

Significance. If the central claim is established, this would be a notable advance: all previous reports of spin-phonon coupling in 2D vdW magnets are at cryogenic temperatures, and a room-temperature value would be of direct relevance to spintronic applications. The paper contains original Raman data on hBN-encapsulated flakes, transport and magnetization characterization, and DFT phonon calculations that support the qualitative existence of spin-phonon coupling. However, the quantitative claim depends on a 0.143 cm^-1 deviation from an anharmonic baseline whose fitting protocol is not reported, and the conversion from magnetization to the spin-correlation value <S_i·S_j> is not derived. The strength of the paper is its relatively comprehensive set of measurements, but the central numerical result is not yet established with the needed statistical rigor.

major comments (3)

[Spin-phonon coupling in Fe3GaTe2 (Figure 6e,f)] The anharmonic model fit is not sufficiently specified: the temperature window used for the fit is not given, the fitted parameters ω_p(0) and A are not reported, and no residuals or uncertainties on the extracted ω_p values are provided. The deviation at 300 K is only 0.143 cm^-1, which is comparable to typical Raman peak-fitting errors and to the point-to-point scatter implied by the N=3 error bars. Without a statement of the fit range and a statistical comparison of the residuals above and below TC (with propagated uncertainties), the existence of a magnetic contribution to the phonon frequency is not established. This is load-bearing because the central claim of room-temperature spin-phonon coupling rests directly on this deviation.
[Spin-phonon coupling in Fe3GaTe2, λ conversion] The conversion from the measured saturation magnetization (MS ≈ 48.8 emu/g, or 1.43 μB/Fe at 300 K) to the nearest-neighbor spin correlation <S_i·S_j> ≈ 0.51 is stated with a citation to a Cr2Ge2Te6 study but without any derivation or justification for Fe3GaTe2. Since the spin-phonon coupling strength is computed as λ = Δω_p/<S_i·S_j>, the quoted value of 0.28 cm^-1 scales inversely with the assumed correlation. A different reasonable estimate—for example using (M/M_sat)^2 with a saturated moment of about 2.8 μB/Fe—would change λ substantially. The quantitative strength of the spin-phonon coupling is therefore not robust without a proper derivation or an explicit range of <S_i·S_j>.
[Spin-phonon coupling in Fe3GaTe2 (Figure 5) and Experimental Section] The DFT comparison between ferromagnetic and nonmagnetic interlayer spin ordering is presented as evidence for spin-phonon coupling, but the manuscript does not state whether the FM and NM phonon calculations were performed at the same lattice parameters or at independently relaxed structures. If the lattice parameters differ between the two magnetic states, the observed phonon shifts could partly reflect equilibrium volume or bond-length changes (exchange striction) rather than dynamical spin-phonon coupling. The authors should report the relaxed lattice constants for each magnetic configuration and, if they differ, quantify the effect of the structural change on the phonon frequencies.

minor comments (6)

[Experimental Section, First-principles calculations] The term 'nonmagnetic interlayer spin ordering' is confusing when applied to the monolayer case, where there is no interlayer ordering; presumably a non-spin-polarized (NM) calculation is meant. Please clarify the terminology.
[Figure 3 and thickness-dependent Raman] The experimental A1g^1 frequencies (103.2–105 cm^-1) are systematically lower than the computed bulk value (107 cm^-1) by about 2–4 cm^-1, yet the paper does not discuss this discrepancy; this should be addressed because it bears on the thickness-dependent comparison.
[Figure 6e] The text refers to the anharmonic fit as a 'red line' while the figure caption calls it a 'red dash curve'; please use consistent terminology throughout.
[Equation for the anharmonic model] The displayed equation for ω_anh(T) is typeset in a way that obscures the denominator; it should be written as ω_anh(T) = ω_p(0) − A[1 + 2/(exp(ħω_p(0)/(2k_B T)) − 1)] to avoid ambiguity.
[Table 1] In Table 1, the second CrBr3 entry (at 19 K) is missing the material name, and the table would be easier to interpret if the λ values were accompanied by the same definition of λ used in this work.
[Data Availability Statement] The data availability statement says data are available 'upon reasonable request'; including the temperature-dependent Raman frequencies, the anharmonic fit parameters, and the fitted residuals in the Supporting Information would materially strengthen the paper and allow independent assessment of the central claim.

Circularity Check

0 steps flagged · score 2.0 of 10

No significant circularity: the spin-phonon signal is an experimental residual, not a fitted input; self-citations are not load-bearing.

full rationale

The central claim (spin-phonon coupling, lambda ~0.28 cm-1 at 300 K) is derived from measured temperature-dependent Raman frequencies. The anharmonic model shown with Figure 6e is fit to those frequencies, and Delta omega_p(T) = omega_p(T) - omega_anh(T) is the residual; the paper does not identify a fitted parameter that is then renamed as a prediction. The conversion lambda = Delta omega_p / <S_i.S_j> uses a measured magnetization value and an externally cited estimate of <S_i.S_j> ~0.51 (ref 14), so the magnitude of lambda inherits model dependence (e.g., how <S_i.S_j> is estimated from M_S) but is not equivalent to the input by construction. The DFT FM-vs-NM phonon comparison is a first-principles calculation and provides independent supporting evidence. Several references are to the authors' prior Fe3GaTe2 work (e.g., U = 1.5 eV from ref 28), but none of these carries the central room-temperature claim, which rests on the experimental Raman deviation. Missing fit-range details, residuals, and statistical significance tests are reproducibility concerns, not circular reductions.

Assumptions & free parameters 3 free parameters · 4 assumptions · 0 invented entities

The central claim rests on two fitted/model-dependent inputs: the anharmonic model parameters and the inferred spin correlation <S_i·S_j>. No new physical entities are introduced.

free parameters (3)

Anharmonic model parameters omega_p(0) and A = Not stated in text
The anharmonic model is fit to the temperature-dependent Raman frequencies; the fitting range is not specified, and the deviation below TC, which defines the spin-phonon signal, depends on these fitted values.
Nearest-neighbor spin correlation <S_i·S_j> at 300 K = 0.51
Inferred from the saturation magnetization (1.43 μB/Fe) with no derivation shown; it directly sets the coupling strength via λ = Δωp / <S_i·S_j>.
Hubbard U for Fe 3d electrons = 1.5 eV
Adopted from the authors' prior work (ref 28) for GGA+U calculations; affects the phonon frequencies and the FM/NM comparison.

assumptions (4)

domain assumption The deviation of phonon frequency from the anharmonic model below TC is entirely due to spin-phonon coupling, with no contribution from thermal expansion, electron-phonon coupling, or measurement artifacts.
This is the standard interpretation in prior spin-phonon studies (refs 14, 15, 41, 42), but the paper does not rule out alternative contributions.
domain assumption The nearest-neighbor relation Δωp = λ<S_i·S_j> is valid for Fe3GaTe2.
Adopted from refs 14, 45, 46; the paper assumes this form without deriving it for Fe3GaTe2.
domain assumption DFT with PBE+U (U=1.5 eV) and optB86-vdW describes the phonons and magnetic ordering of Fe3GaTe2 accurately enough for the FM/NM comparison.
Standard first-principles approach; the U value is taken from the authors' prior publication rather than independently benchmarked.
domain assumption The nonmagnetic (NM) state is a valid reference state for isolating spin-phonon coupling, even though it is not the ground state.
The paper compares FM and NM phonon dispersions; the NM state is artificial but serves as a computational baseline.

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Cite this review

Pith. "Pith review of Lattice Vibration, Raman Modes and Room-Temperature Spin-Phonon Coupling in Intrinsic 2D van der Waals Ferromagnetic Fe3GaTe2." pith.science (2026). https://pith.science/paper/YFNMO5FI

@misc{pith2026241119533,
  author       = {Pith},
  title        = {Pith review of: Lattice Vibration, Raman Modes and Room-Temperature Spin-Phonon Coupling in Intrinsic 2D van der Waals Ferromagnetic Fe3GaTe2},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/YFNMO5FI}},
  note         = {Machine review of arXiv:2411.19533}
}

read the original abstract

Two-dimensional (2D) van der Waals (vdW) magnets with spin-phonon coupling are crucial for next-generation spintronics. Among them, Fe3GaTe2 has attracted widespread attention due to above-room-temperature intrinsic ferromagnetism and large perpendicular magnetic anisotropy. However, the lattice vibrations and the interplay between ferromagnetism and lattice vibrations in Fe3GaTe2 are still unexplored. Here, we report the lattice vibration, Raman modes, and room-temperature spin-phonon coupling in 2D Fe3GaTe2 with above-room-temperature Curie temperature (TC). Two typical Raman modes with out-of-plane lattice vibrations are identified: "A" _"1g" ^"1" and "A" _"1g" ^"2" , whose frequencies increase as the thickness decreases from bulk to 2D Fe3GaTe2 due to the weakening of interlayer vdW interactions and spin exchange coupling. Moreover, the difference between phonon band dispersions under ferromagnetic and nonmagnetic interlayer spin ordering indicates the existence of spin-phonon coupling. The phonon frequency diverges from the anharmonic model below TC and thus the strength of spin-phonon coupling is ~0.28 cm-1 at 300 K, which is the first experimental identification of room-temperature spin-phonon coupling in 2D vdW magnets. This work deepens the understanding of novel 2D vdW magnets and provides a basis for spintronic applications at and above room temperature.

Figures

Figures reproduced from arXiv: 2411.19533 by the authors.

**Figure 2.** Above-room-temperature intrinsic ferromagnetism in 2D Fe3GaTe2. (a) Optical image of the Hall device based on the 2D Fe3GaTe2 nanosheet. (b) AFM profile height curve of the as-tested 13 nm Fe3GaTe2 nanosheet. (c) Magnetic field-dependent Hall resistance (Rxy-B) curves under different temperatures above room temperature. Lattice vibrations and thickness-dependent Raman modes of Fe3GaTe2. Raman spectroscopy is a fast … view at source ↗

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Works this paper leans on

8 extracted references · 8 canonical work pages

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Pith tools

Reviewed August 12, 2026 · model on record in the stance chip above.

[1] [1]

H.; Serna, M

(1) Akinwande, D.; Huyghebaert, C.; Wang, C. H.; Serna, M. I.; Goossens, S.; Li, L. J.; Wong, H. P.; Koppens, F. H. L. Graphene and two-dimensional materials for silicon technology. Nature 2019, 573, 507-518. (2) Fiori, G.; Bonaccorso, F.; Iannaccone, G.; Palacios, T.; Neumaier, D.; Seabaugh, A.; Banerjee, S. K.; Colombo, L. Electronics based on two -dime...

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[2] [3]

Phys. Chem. Chem. Phys. 2018, 20, 23546-23555. (39) Liu, Y .; Liu, Q.; Liu, Y .; Jiang, X.; Zhang, X.; Zhao, J. Effects of spin-phonon coupling on two -dimensional ferromagnetic semiconductors: a case study of iron and ruthenium trihalides. Nanoscale 2021, 13, 7714-7722. (40) Tan, C.; Lee, J.; Jung, S. G.; Park, T.; Albarakati, S.; Partridge, J.; Field, M...

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A.; Liu, S.; Granados Del Aguila, A.; Huang, Y .; Zhang, L.; Serra, M.; Sedmidubsky, D.; Sofer, Z.; Quek, S

(17) Yin, T.; Ulman, K. A.; Liu, S.; Granados Del Aguila, A.; Huang, Y .; Zhang, L.; Serra, M.; Sedmidubsky, D.; Sofer, Z.; Quek, S. Y .; et al. Chiral Phonons and Giant Magneto -Optical Effect in CrBr 3 2D Magnet. Adv. Mater. 2021, 33, e2101618. (18) Casto, L. D.; Clune, A. J.; Yokosuk, M. O.; Musfeldt, J. L.; Williams, T. J.; Zhuang, H. L.; Lin, M. W.; ...

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S.; Choe, J.; Rodriguez -Vega, M.; Khalsa, G.; Benedek, N

(41) Olsson, K. S.; Choe, J.; Rodriguez -Vega, M.; Khalsa, G.; Benedek, N. A.; He, J.; Fang, B.; Zhou, J.; Fiete, G. A.; Li, X. Spin -phonon interaction in yttrium iron garnet. Phys. Rev. B 2021, 104, L020401. (42) Liu, Y .; Ai, Q.; Ye, G.; Ye, Z.; Hruby, J.; Wang, F.; Orlando, T.; Wang, Y .; Luo, J.; Fang, Q.; et al. Spin -Phonon Coupling in Iron -Doped ...

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[5] [2492]

L.; Wyder, P

(12) Strohm, C.; Rikken, G. L.; Wyder, P. Phenomenological evidence for the phonon Hall effect. Phys. Rev. Lett. 2005, 95, 155901. (13) Jaworski, C. M.; Yang, J.; Mack, S.; Awschalom, D. D.; Myers, R. C.; Heremans, J. P. Spin-seebeck effect: a phonon driven spin distribution. Phys. Rev. Lett. 2011, 106, 186601. (14) Tian, Y .; Gray, M. J.; Ji, H.; Cava, R...

work page 2005

[6] [3278]

Giant 2D Skyrmion Topological Hall Effect with Ultrawide Temperature Window and Low -Current Manipulation in 2D Room - Temperature Ferromagnetic Crystals

(27) Zhang, G.; Luo, Q.; Wen, X.; Wu, H.; Yang, L.; Jin, W.; Li, L.; Zhang, J.; Zhang, W.; Shu, H.; et al. Giant 2D Skyrmion Topological Hall Effect with Ultrawide Temperature Window and Low -Current Manipulation in 2D Room - Temperature Ferromagnetic Crystals. Chin. Phys. Lett. 2023, 40, 117501. (28) Zhang, G.; Yu, J.; Wu, H.; Yang, L.; Jin, W.; Xiao, B....

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A.; Morgan, D.; Ceder, G

(52) Zhou, F.; Cococcioni, M.; Marianetti, C. A.; Morgan, D.; Ceder, G. First - principles prediction of redox potentials in transition -metal compounds with LDA+U. Phys. Rev. B 2004, 70, 235121. (53) Klimes, J.; Bowler, D. R.; Michaelides, A. Chemical accuracy for the van der Waals density functional. J. Phys.: Condens. Matter. 2010, 22, 022201. (54) Kli...

work page 2004

[8] [5067]

Kajale; Thanh Nguyen; Nguyen Tuan Hung; Mingda Li; Sarkar, D

(20) Shivam N. Kajale; Thanh Nguyen; Nguyen Tuan Hung; Mingda Li; Sarkar, D. Field-free deterministic switching of all–van der Waals spin-orbit torque system above room temperature. Sci. Adv. 2024, 10, eadk8669. (21) Jin, W.; Zhang, G.; Wu, H.; Yang, L.; Zhang, W.; Chang, H. Room-Temperature and Tunable Tunneling Magnetoresistance in Fe 3GaTe2-Based 2D va...

work page 2024