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REVIEW 3 major objections 5 minor 64 references

Unconventional magnon transport in antiferromagnet NiPS$_3$ induced by an anisotropic spin-flop transition

T0 review · 3 major / 5 minor · reviewed 2026-08-07 · deepseek-v4-flash

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Pith's one-line read In few-layer NiPS3, the nonlocal voltage from thermally driven magnons jumps sharply at specific in-plane field angles near the b-axis, which the authors attribute to an anisotropic spin-flop transition; the $1/d^2$ decay marks the…

desk verdict Sharp angular jumps in nonlocal magnon signal near the b-axis of NiPS3 are a real and reproducible effect, but the spin-flop explanation depends on a b-axis domain that is inferred, not observed. read the letter →

arxiv 2505.23482 v1 pith:VYIBEOKY submitted 2025-05-29 cond-mat.mes-hall

Peisen Yuan , Beatriz Martín-García , Evgeny Modin , M. Xochitl Aguilar-Pujol , Fèlix Casanova , Luis E. Hueso This is my paper
classification cond-mat.mes-hall
keywords magnontransportspin-floptransitionNiPS3vanderWaalsantiferromagnetspinSeebeckeffectnonlocaldetectionmagneticanisotropytwo-dimensionalmagnets
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 tries to show that nonlocal magnon transport can detect a magnetic phase transition in the easy-plane van der Waals antiferromagnet NiPS3, where the spins lie in the plane of the flake. Heating a platinum strip injects thermally excited magnons into NiPS3, and a second platinum strip converts the arriving spin current into a voltage via the inverse spin Hall effect. The authors find that this nonlocal voltage, measured as the field angle is rotated at 9 T and 20 K, shows sharp jumps near the b-axis instead of the smooth $\sin\theta$ curve seen in YIG/Pt, and they attribute the jumps to an in-plane anisotropic spin-flop transition, a sudden reorientation of the antiparallel spin lattice at a threshold field whose value depends on field direction. In a 12 nm flake the signal decays as $1/d^2$ with injector-detector separation, which they take as evidence that the signal is dominated by the intrinsic spin Seebeck effect rather than magnon diffusion. The paper thereby positions nonlocal magnon transport as a sensitive probe of magnetic phase transitions in two-dimensional antiferromagnets, and it argues that a b-axis magnetic domain hidden under the platinum contacts is responsible for the jumps.

What carries the argument

The load-bearing object is the second-harmonic nonlocal voltage measured between two parallel platinum strips on an insulating NiPS3 flake. Joule heating in the injector creates a radial temperature gradient and a magnon chemical potential imbalance that drives thermally excited magnons toward the detector, where the inverse spin Hall effect converts the spin current into a transverse voltage. The argument rests on the angular dependence of this voltage as an in-plane magnetic field is rotated: at high field the response is modelled as the sum of contributions from an a-axis-aligned magnetic domain that rotates coherently and a b-axis-aligned domain that undergoes a spin-flop transition, with the jumps appearing at field directions where the spin-flop-induced magnetization component normal to the platinum strips changes sign or vanishes. The $1/d^2$ decay in the 12 nm flake is attributed to the intrinsic spin Seebeck effect from the bottom interface, which becomes dominant when the magnon diffusion length is short.

What would settle it

A direct magnetic imaging measurement of the Pt-covered region of a similar NiPS3 device at 9 T and 20 K that sees no magnetic domain with spins along the b-axis would undercut the two-domain explanation for the angular jumps. Alternatively, if a field sweep with B exactly along the b-axis of a device whose b-axis is independently confirmed by EBSD shows no upturn or sharp feature, the spin-flop assignment would fail.

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Extended reading notes

Core claim

The central claim is that the spin-flop transition in few-layer NiPS3 becomes visible in the angular dependence of thermally driven magnon transport. In devices with platinum strips oriented near the b-axis, the second-harmonic nonlocal voltage is not the smooth $\sin\theta$ response observed in YIG/Pt but shows sharp jumps when the in-plane magnetic field points near the b-axis; these jumps appear only above about 7 T and disappear toward lower fields, and the angle at which they occur rotates with the Pt-strip orientation and always maps back to the b-axis. Field sweeps with the field along the b-axis show a small upturn consistent with a spin-flop transition, while sweeps along the a-axis do not, showing that the spin-flop field is anisotropic. The authors explain the behaviour with two coexisting magnetic domains, one with spins along the a-axis, previously seen, and one with spins along the b-axis, induced by strain and thermal effects under the platinum strips, and they further report that in a 12 nm flake the signal amplitude obeys $1/d^2$ over 0.8–3.8 μm, which they attribute to the intrinsic spin Seebeck effect from the NiPS3/substrate interface.

Load-bearing premise

The model assumes that a small magnetic domain with spins aligned along the b-axis of NiPS3 exists underneath the platinum strips, even though no direct image of that domain is reported; remove that domain and the angular-jump mechanism has no support.

Editorial extensions

If this is right

  • If the spin-flop assignment is right, angle-dependent nonlocal magnon measurements can map the in-plane anisotropy of the spin-flop field in easy-plane van der Waals antiferromagnets.
  • The $1/d^2$ decay means that micrometre-separated nonlocal signals in thin NiPS3 are dominated by the substrate-interface spin Seebeck effect, so distance-dependent measurements are necessary to separate diffusion from intrinsic spin Seebeck contributions.
  • The proposed b-axis domain implies that platinum deposition modifies the magnetic texture underneath the contacts, so contact engineering can change the observed magnon transport response.
  • The absence of a first-harmonic signal while second-harmonic thermal magnon signals are measurable indicates that thermally driven magnons are the accessible transport channel in this material system.

Reading between the lines

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

  • Beyond the paper: the jump angle in the nonlocal signal could be used as a local, contact-level magnetometer for strain-induced magnetic anisotropy, since the jump position tracks the local easy direction rather than the global crystal axis.
  • Beyond the paper: if strain from the platinum is what stabilises the b-axis domain, then choosing different contact metals, strip widths, or annealing conditions could tune the domain population and thereby engineer when the spin-flop jump appears.
  • Beyond the paper: the $1/d^2$ regime at micrometre distances suggests that in other short-diffusion-length van der Waals antiferromagnets, nominally 'nonlocal' signals may contain a substantial intrinsic spin Seebeck component, and distance sweeps should be a routine control.
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Editorial analysis

A structured set of objections, weighed in public.

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

Referee Report

3 major / 5 minor

Summary. This manuscript reports nonlocal second-harmonic voltage measurements in few-layer NiPS3 devices with Pt injector/detector strips. The authors observe sharp jumps in the angular dependence of the thermally driven magnon signal when the in-plane magnetic field is near the b-axis at high field (9 T), and a weak upturn in the field dependence for B//b. They attribute these features to an in-plane anisotropic spin-flop transition occurring in a hypothesized b-axis-aligned magnetic domain under the Pt strips, while a coexisting a-axis domain undergoes coherent rotation. They also report that the nonlocal signal decays as 1/d^2 in a 12-nm-thick flake, which they ascribe to the intrinsic spin Seebeck effect. The manuscript includes EBSD and polarized photoluminescence characterization of the crystal axes, measurements on three devices with different Pt-strip orientations, and a YIG control sample.

Significance. If the interpretation is correct, the paper would demonstrate electrical detection of an anisotropic spin-flop transition in a van der Waals antiferromagnet via thermally driven magnon transport, which is a valuable addition to the growing effort on nonlocal magnon transport in 2D magnets. The reported reproducibility across multiple devices, the EBSD-PL axis calibration, the YIG comparison, and the field-dependent measurements are genuine strengths: they establish that the angular jumps are not a single-device artifact and that the phenomenon is tied to the b-axis direction. The 1/d^2 distance dependence, if robust, is also significant evidence for the intrinsic spin Seebeck mechanism in a thin antiferromagnet. However, the central claim is weakened by a load-bearing assumption that is not directly verified and by the lack of a quantitative model connecting the two-domain picture to the measured angular curves.

major comments (3)
  1. [Supporting Information, 'The origin of the proposed domain structure with spin along the b-axis of NiPS3'] The central interpretation hinges on an unobserved magnetic domain with spins along the b-axis underneath the Pt strips. The SI explicitly states that such a domain is 'reasonable to expect' from Pt-induced strain and thermal fluctuations, but also acknowledges that 'detecting such a small-scale magnetic domain structure at the Pt/NiPS3 interface is challenging using traditional polarized PL or LD techniques.' The authors then use this postulated domain to explain the observed jumps (Figure 4a). This is circular: the domain is inferred from the same jumps it is invoked to explain, and no independent evidence is provided. The Raman data in Figure S7 demonstrate structural disorder under Pt, but do not establish a 90-degree rotation of the easy axis. Because the spin-flop assignment rests on this domain, the paper needs either direct experimental evidence for the b-axis domain (for example, spatially resolved magnetic imaging with sensitivity under the Pt, or an alternative geometry where the domain can be probed) or a substantial reframing of the conclusions as a hypothesis rather than a demonstration.
  2. [§4, Figure 4a and Figure 3b] The two-domain model is presented only qualitatively. No equation or fitting procedure is given for the angular dependence V_NL(B, θ), nor for the jump positions across devices. The authors state that the jumps shift from 85° to 125° to 150° for devices 1-3 and that 'all these arrows are similarly aligned to the b-axis,' but the angular offset between the Pt strips and the b-axis is treated as a free parameter. Without a quantitative model, it is not demonstrated that a spin-flop transition in a b-axis domain, combined with coherent rotation in an a-axis domain, reproduces the sharp jumps, their angle-dependent amplitudes, or the near-zero signal at 90°. A quantitative fit—using the known anisotropy and exchange fields, or at least a minimal two-domain parametrization—is needed to make the interpretation convincing.
  3. [§3, Figure 3a and Figure 4d] The identification of the features as a spin-flop transition requires a comparison with the expected spin-flop field scale for NiPS3. The authors cite Basnet et al. for the bulk spin-flop transition but do not show that the observed threshold (between 7 and 9 T near the b-axis, and absent along the a-axis) is quantitatively consistent with the known H_E and H_A of NiPS3. The field-dependent upturn in Figure 4d is described as 'small' and is attributed to a 2-3 degree angular offset; this is a weak signature on which to base the central claim. Alternative mechanisms, such as field-driven domain-wall motion or coherent rotation in a multidomain easy-plane antiferromagnet, could produce abrupt changes in the net magnetization component and therefore in the nonlocal SSE signal. The authors should either identify a feature that is uniquely diagnostic of a spin-flop transition or explicitly discuss why these alternatives are excluded.
minor comments (5)
  1. [Abstract] The abstract contains a typo: 'mag non transport' should read 'magnon transport'.
  2. [Figure 5c] The 1/d^2 fit in Figure 5c appears to be based on a small number of points without error bars. The authors should provide the number of data points, the fitting statistic, and ideally show the data points with uncertainties, to justify the claim that 1/d^2 is preferred over an exponential decay.
  3. [§5, Figure 5 and Figure S6] The statement that for the 12-nm flake 'λm cannot be extracted by the typical exponential fitting' is vague. The authors should specify the fitting range and the criterion used (e.g., R^2, residual analysis) to support the conclusion that the decay is not exponential.
  4. [§3, Figure 3b] The manuscript would benefit from a table listing, for each device, the Pt-strip orientation with respect to the b-axis, the measured jump angle, and the inferred angular offset. This would make the device-to-device comparison in Figure 3b more transparent than the qualitative description.
  5. [Figure 2c] The y-axis label uses an inconsistent notation for the normalized second-harmonic voltage; the authors should define V_NL^th/I^2 explicitly in the figure caption or at first use in the text.

Circularity Check

1 steps flagged · score 6.0 of 10

Spin-flop interpretation rests on an unobserved b-axis domain inferred from the same magnon signal it is used to explain; partial interpretive circularity.

  1. self definitional [Main text, Fig. 4a model paragraph; SI section 'The origin of the proposed domain structure with spin along the b-axis of NiPS3']
    "Based on the reported multidomain magnetic structures, the IP magnetic anisotropy, and the jump behavior of nonlocal magnon signals in this work, we propose the existence of two magnetic domains with spin configurations aligned along the a-axis and b-axis of NiPS3, respectively, to understand our experimental results. ... Instead, the Néel vector orientations within these domains can be inferred from our spin-related magnon transport measurements"

    The b-axis domain (domain 2) is the load-bearing ingredient in the Fig. 4a spin-flop model, but its existence is inferred solely from the angular jumps and near-zero signal at B//b, the very phenomena it is invoked to explain. The SI rules out direct detection ('detecting such a small-scale magnetic domain structure at the Pt/NiPS3 interface is challenging') and then states that the domain orientations are 'inferred from our spin-related magnon transport measurements'—i.e., from the same nonlocal signal whose angular and field dependence is the claimed evidence for the spin-flop transition. Thus the model does not independently predict the jumps; it postulates the domain to match them, making the spin-flop attribution circular.

full rationale

The paper contains no equation-level circularity: the 1/d^2 decay fit is a standard empirical criterion from prior YIG work, and no fitted parameter is renamed as a prediction. The circularity is interpretive and located in the spin-flop attribution. The Fig. 4a model explains the sharp angular jumps and field-dependent upturn near the b-axis by postulating a second magnetic domain with spins along the b-axis under the Pt strips. That domain is not observed; the SI says it is 'reasonable to expect' from strain and thermal fluctuations, citing Tan et al., Lee et al., and the authors' own prior Pt-disorder study, and explicitly says such domains 'can be inferred from our spin-related magnon transport measurements.' In other words, the domain is inferred from the same nonlocal signal whose jumps and upturn are then attributed to a spin-flop transition. This is self-definitional: the crucial magnetic configuration is defined through the phenomenon it is meant to explain. The three-device consistency and the B//b field-dependent upturn are genuine internal checks and prevent the paper from being fully circular, but they do not provide an independent measurement of the Néel vector orientation under Pt. The self-citation to the authors' prior Pt-disorder study is not itself load-bearing enough to raise the score independently; the circularity comes from using the target signal as evidence for the domain that then explains that signal. Hence score 6 rather than higher.

Assumptions & free parameters 2 free parameters · 5 assumptions · 1 invented entities

The central claim depends on standard antiferromagnet spin-flop concepts and on a domain structure that is not directly evidenced. The only numerically fitted inputs are the magnon relaxation lengths used to justify the 1/d^2 regime and an assumed small angular misalignment. The b-axis domain is the main invented element and carries most of the interpretive weight.

free parameters (2)
  • Magnon relaxation length lambda_m for 18-nm NiPS3 devices = approximately 1.1 um (maximum), thickness-dependent
    Extracted by exponential fits to nonlocal signal vs distance in Figure S6; used to argue that the 12-nm device is in the 1/d^2 regime.
  • Pt strip to b-axis angular offset = 2-3 degrees (assumed)
    Invoked to explain the residual nonlocal signal when B is nominally along the b-axis; not measured independently.
assumptions (5)
  • domain assumption NiPS3 is an easy-plane (XY-type) antiferromagnet with Neel order below about 150 K and moments predominantly in the ab-plane.
    Invoked throughout the motivation and in Figure 4; based on cited bulk work (Afanasiev et al., Wildes et al.).
  • domain assumption An in-plane spin-flop transition occurs when the magnetic field exceeds HSF, with HSF set by exchange and anisotropy fields.
    Used to interpret jumps in angular dependence as spin-flop (Introduction and Figure 4).
  • domain assumption The nonlocal thermally driven signal is proportional to the component of net magnetization normal to the Pt strips.
    Taken from easy-axis antiferromagnet studies (Lebrun et al. 2018) and applied to easy-plane NiPS3 in Figure 4.
  • domain assumption The intrinsic spin Seebeck effect produces a 1/d^2 decay once the injector-detector distance exceeds about 3-5 magnon relaxation lengths.
    Used to interpret Figure 5c; from YIG studies (Shan et al., Giles et al.).
  • ad hoc to paper A magnetic domain with spins along the b-axis exists underneath the Pt electrodes in few-layer NiPS3 devices.
    Proposed after the jumps were observed; motivated by prior domain imaging and Pt-induced strain/Raman changes, but not directly observed here.
invented entities (1)
  • b-axis-aligned magnetic domain under Pt strips in NiPS3
    purpose: Explains the sharp angular jumps and near-zero signal when B is along the b-axis at 9 T.
    No direct imaging or magnetization data in this paper; prior studies report domains at plus/minus 120 degrees and 10-30 degrees offsets from the a-axis, not exactly along b. The existence is inferred from the transport signal itself.

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Cite this review

Pith. "Pith review of Unconventional magnon transport in antiferromagnet NiPS$_3$ induced by an anisotropic spin-flop transition." pith.science (2026). https://pith.science/paper/VYIBEOKY

@misc{pith2026250523482,
  author       = {Pith},
  title        = {Pith review of: Unconventional magnon transport in antiferromagnet NiPS$_3$ induced by an anisotropic spin-flop transition},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/VYIBEOKY}},
  note         = {Machine review of arXiv:2505.23482}
}
abstract

Nonlocal magnon transport can provide valuable insight into the magnetic properties of magnetic insulators (MIs). A spin-flop transition, a typical magnetic reorientation in antiferromagnets, is expected to affect mag non transport, but studies on this topic are still rare and remain challenging, especially for van der Waals materials. Here we demonstrate the unconventional magnon transport driven by an anisotropic spin-flop transition in the van der Waals antiferromagnet NiPS$_3$. Examining the nonlocal voltage from thermally driven magnons reveals sharp jumps at certain directions when an inplane magnetic field aligns with the b-axis of NiPS$_3$, attributed to an in-plane anisotropic spin-flop transition. Furthermore, thermally driven magnon signal exhibits a 1/d$^2$ decay in thin NiPS$_3$, evidencing that it is dominated by the intrinsic spin Seebeck effect. Our findings highlight that the electrical detection of magnon currents in a nonlocal device geometry serves as a powerful approach for studying magnetic phase transitions in MIs.

Figures

Figures reproduced from arXiv: 2505.23482 by the authors.

Figure 5
Figure 5. (a) Optical image of the fabricated nonlocal device with a 12-nm-thick NiPS3 flake. (b) Angular dependence of the nonlocal thermally excited magnon signal of the device shown in panel (a) for different injector-detector distances d. The measurements were performed at 20 K, 9 T and 100 μA. (c) Amplitude of the angle-dependent nonlocal magnon signal as a function of d, where the amplitude is extracted from the differe… view at source ↗

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