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REVIEW 4 major objections 5 minor 36 references

Emergent ferromagnetism in the NiI$_2$-NbSe$_2$ van der Waals heterostructure

T0 review · 4 major / 5 minor · reviewed 2026-08-01 · deepseek-v4-flash

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Pith's one-line read Placing monolayer NiI2 on a superconducting NbSe2 substrate drives its magnetic ground state from a spin spiral to a ferromagnet, through substrate-induced renormalization of the exchange couplings.

desk verdict Plausible and potentially important claim of substrate-driven helix-to-ferromagnet transition in NiI2/NbSe2, but the experimental proof rests on a negative observation that screening could explain; worth refereeing, with room for revision. read the letter →

arxiv 2607.21218 v1 pith:5CS2FJDB submitted 2026-07-23 cond-mat.mes-hall cond-mat.mtrl-sci

Büşra Gamze Arslan , Mohammad Amini , Ziying Wang , Alessandro Orsini , Jose L. Lado , Adolfo O. Fumega , Robert Drost , Peter Liljeroth This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.mtrl-sci
keywords two-dimensionalmultiferroicsNiI2monolayerNbSe2substrateYu-Shiba-Rusinovstatesproximity-inducedmagnetismRKKYexchangerenormalizationspin-spiraltoferromagnetictransitionscanningtunnelingmicroscopy/spectroscopy
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 argues that the magnetic ground state of monolayer NiI2—a candidate 2D multiferroic that on inert substrates hosts a spin-spiral order—is overturned by proximity to the metallic superconductor NbSe2. Using low-temperature STM and STS, the authors find no sign of the ferroelectric stripe pattern expected for the spin spiral, and instead observe Yu–Shiba–Rusinov bound states inside NbSe2's superconducting gap whose spectra and real-space maps match a ferromagnetic NiI2 layer. Density-functional calculations support the picture: NbSe2's strongly ferromagnetic RKKY susceptibility renormalizes the Ni exchange couplings, moving the minimum of the spin-spiral energy to zero wavevector. The work matters because it demonstrates substrate engineering as a handle on magnetic order in atomically thin multiferroics, and introduces YSR states as a spin-averaged in situ probe of 2D magnetism.

What carries the argument

The argument hinges on the exchange-coupling renormalization of NiI2 by the substrate, captured in two complementary calculations: DFT spin-spiral energy curves E(q) using the generalized Bloch theorem, whose minimum moves from finite q to q=0 in the heterostructure; and a Bogoliubov–de Gennes model of NbSe2 with a spatially modulated exchange field J(r), which generates Yu–Shiba–Rusinov (YSR) bands—bound quasiparticle states that a magnetic moment induces inside a superconductor's gap—whose energy spectra and real-space maps distinguish ferromagnetic from spin-spiral order.

What would settle it

A spin-resolved STM image of the same NiI2 islands showing a magnetic spiral modulation, or a YSR spectrum that matches the calculated spin-spiral response in a sample where the stripe pattern is absent, would disprove the ferromagnetic ground state.

Watch

Extended reading notes

Core claim

The central discovery is that the spin-spiral (helimagnetic) ground state of monolayer NiI2 is replaced by a ferromagnetic ground state when the layer is grown on NbSe2, and that this transition is visible in the YSR states of the underlying superconductor. The authors show that the NbSe2 substrate, being close to a ferromagnetic instability, transfers a ferromagnetic RKKY interaction that renormalizes the first- and third-neighbor exchange couplings in NiI2, shifting the minimum of the spin-spiral energy from a finite wavevector to zero. Experimentally, the ferromagnetic state is inferred from the absence of ferroelectric stripes, from YSR bands inside the superconducting gap, and from edge

Load-bearing premise

The conclusion rests on reading the absence of ferroelectric stripes and the shape of the YSR spectra as proof that the spin spiral is gone; if those stripes are suppressed by other substrate effects while the spiral survives, the central claim would not hold.

Editorial extensions

If this is right

  • YSR states can serve as an in situ, spin-averaged probe of the magnetic ground state of a 2D magnet placed on a superconductor.
  • Substrate engineering—proximity to a metal with large ferromagnetic susceptibility—can switch magnetic order in atomically thin layers.
  • NiI2 becomes a substrate-tunable frustrated magnet whose competing exchange interactions can be biased toward ferromagnetism.
  • The edges of NiI2 islands show enhanced magnetic coupling to NbSe2, giving edge-localized YSR states modulated by the moiré pattern.
  • This opens a route to combining multiferroic order and superconductivity in van der Waals heterostructures.

Reading between the lines

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

  • If the mechanism is generic, other nickel dihalide monolayers (e.g., NiBr2, NiCl2) on strongly susceptible metals should show similar helimagnet-to-ferromagnet transitions, which could be tested with the same YSR readout.
  • The YSR band modulation over the moiré period could be used as a local probe of the exchange field's spatial variation, effectively mapping magnetic coupling at the nanoscale.
  • The absence of ferroelectric stripes might also result from substrate screening of the electric polarization even if a spiral persisted, so a direct spin-resolved measurement would cleanly separate these effects.
  • The edge-dependent double-stripe LDOS pattern suggests island shape and edge termination control the magnetic coupling, implying that growth geometry could pattern magnetic textures at the nanoscale.
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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

4 major / 5 minor

Summary. The paper reports STM/STS measurements and DFT calculations on monolayer NiI2 grown on superconducting NbSe2. The authors claim that the metallic substrate renormalizes the exchange interactions in NiI2, driving a transition from the helimagnetic ground state of free-standing NiI2 to a ferromagnetic ground state. Experimental evidence includes the absence of the ferroelectric stripe pattern observed on graphite, reduced coherence peaks and in-gap YSR-like states in the bulk, and edge LDOS patterns with a symmetry argued to be incompatible with a spin spiral. A low-energy BdG model (Eqs. 1–4) is used to simulate YSR spectra and LDOS maps for ferromagnetic and spin-spiral configurations, with the ferromagnetic case claimed to match experiment.

Significance. If established, this would be a valuable demonstration of substrate-driven magnetic phase control in a monolayer multiferroic and would extend the use of YSR states as a spin-averaged in situ probe of 2D magnetism. The work combines MBE growth, low-temperature STM/STS, DFT with the generalized Bloch theorem, and open-source BdG simulations (pyqula, ref 36), a strong and partly reproducible methodology. The edge-symmetry argument and the q-dependent energy framework are thoughtful. However, the central experimental inference is indirect: the absence of ferroelectric stripes is not a direct measurement of spin order, and the FM-versus-spiral discrimination relies on a parametrized model without quantitative fits. The DFT E(q) result, which is the independent theoretical backbone, is presented only schematically in the main text.

major comments (4)
  1. [Results, first paragraph and Fig. 1d,e] The q-dependent DFT E(q) calculation is the central theoretical support for the exchange renormalization, but the main text shows only schematic energy diagrams (Fig. 1d,e) and states the FM minimum at q=(0,0) without giving numerical E(q) curves, energy differences, or exchange couplings (J1/J3) for freestanding vs heterostructure. This prevents the reader from assessing the strength of the predicted transition. Please include the numerical E(q) data (at least in SI) and computational parameters (U, vdW corrections, k-point sampling).
  2. [Results, first paragraph] The statement 'The absence of ferroelectric stripes indicates that monolayer NiI2 on NbSe2 does not host a non-collinear magnetic ground state' is load-bearing, but the stripe contrast is a ferroelectric/piezoelectric signature, not a direct spin probe. On a metallic substrate, free-carrier screening can suppress the stripe pattern while a spin spiral remains, and the imaging conditions differ from those on graphite. This alternative is not excluded. A control measurement (e.g., identical imaging of NiI2 on a weakly screened substrate in the same setup) or a direct spin-resolved probe is needed to support the claim.
  3. [YSR states subsection, Eqs. (1)–(4)] The FM-vs-spin-spiral assignment rests on qualitative agreement between measured and simulated LDOS. The model contains freely adjustable parameters: the exchange distribution J(r), spiral vector q, moiré modulation, and edge-enhanced coupling. The main text says the spin-spiral 'consistently result[s] in strongly shifted and split coherence peak features' while FM is 'more in-line', but no quantitative comparison (e.g., residuals or fit quality) or parameter-sensitivity analysis is shown. Please provide quantitative metrics and demonstrate that a spin spiral with different q or J distribution cannot reproduce the data.
  4. [YSR states subsection, edge LDOS paragraph] The edge-symmetry argument—that the spin spiral should produce nonequivalent edge contrast on crystallographically identical edges—relies on the model's symmetry breaking. However, the observed 60°/120° edge difference could also arise from iodine termination (up vs down) or moiré registry, as the text itself notes. To support the conclusion, the authors should disentangle these effects, e.g., by comparing multiple edge types on the same island and by simulating termination-dependent coupling explicitly.
minor comments (5)
  1. [Fig. 1d,e] Please label the axes explicitly as q (or propagation vector) and E(q), and specify the energy scale; 'Energy diagrams' alone is ambiguous.
  2. [Fig. 2e] The dashed magenta lines are said to mark the moiré period in both panels c and e, but the text says they correspond to the conduction-band modulation; clarify whether the same positions are used in both panels and whether drift corrections were applied.
  3. [Results, bulk YSR paragraph] At 5 K the authors state the YSR features are 'challenging to resolve in detail', while Fig. 3a is measured at 350 mK. Please clarify how the bulk YSR band is established in the 350 mK data and whether the moiré modulation of the gap (Fig. 2e) is reproducible at sub-Kelvin temperatures.
  4. [Methods / SI] The SI is referenced for parameter values and additional comparisons, but the main text does not state the numerical values of J, Δ, or the moiré-period modulation used in Figs. 3b,c,f,g. Please summarize these parameters in a table or in the main text.
  5. [General] The paper uses 'NiI2' and 'NiI$_{2}$' inconsistently; please standardize formatting. Also, reference 36 is a GitHub repository without version/commit; please cite a version or persistent identifier for reproducibility.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the central claim is supported by a first-principles DFT E(q) calculation and by forward-model YSR simulations whose candidate magnetic states are inputs, not outputs of a fit.

full rationale

The paper's central claim—that NbSe2 renormalizes the exchange interactions in NiI2 and drives a helimagnetic-to-ferromagnetic transition—does not reduce to its inputs by construction. The theoretical backbone is a DFT calculation using the generalized Bloch theorem, where the magnetization is constrained to a spin-spiral form m(r) = m0(cos(q·r), sin(q·r), 0), and the ground state is identified from the minimum of the computed E(q). This is an independent first-principles calculation, not a definitional or fitted result. The YSR simulations are also forward models: the authors explicitly encode two candidate states in J(r) via q = 0 (ferromagnetic) and q ≠ 0 (spin-spiral), then compare the calculated LDOS spectra and real-space maps with experiment. No ground-state parameter is extracted from the experimental spectra to construct the conclusion; rather, the experimental data are compared against the two pre-encoded possibilities. The inference from the absence of ferroelectric stripes to the absence of a non-collinear magnetic ground state is an experimental interpretation and could be challenged (e.g., by substrate screening), but that is a question of evidence strength, not circularity. The self-citations (refs. 12 and 13) are used to establish prior baselines for monolayer NiI2's spin-spiral origin and previous STM observations; they are not invoked as uniqueness theorems or as the sole justification for the ferromagnetic transition. The transition itself is attributed to the authors' DFT E(q) calculation. Therefore, no specific circular step can be identified from the text, and the derivation chain is not circular.

Assumptions & free parameters 1 free parameters · 4 assumptions · 0 invented entities

The core DFT calculation is parameter-free within the chosen exchange-correlation functional, but the experimental interpretation leans on assumptions about the origin of stripes, the magnetic fluctuations of NbSe2, and the validity of the BdG model. The free parameters enter the YSR simulations, not the central DFT result.

free parameters (1)
  • Exchange coupling distribution J(r) in the YSR model = not given (tuned to match experiments)
    The magnitude and moiré modulation of J are parameters adjusted to reproduce the calculated YSR spectra, not derived from first principles.
assumptions (4)
  • domain assumption NbSe2 is close to a ferromagnetic instability and has a dominant ferromagnetic spin susceptibility
    Invoked to explain the proximity effect, based on Ref 31; not verified in this paper.
  • domain assumption The striped pattern observed in NiI2 on graphite originates from the ferroelectric polarization of the spin-spiral ground state
    The paper builds on Ref 13 to interpret the absence of stripes on NbSe2 as evidence for loss of the non-collinear state.
  • domain assumption NiI2 on a graphite substrate hosts a spin-spiral ground state
    Taken from Refs 13,15,16; used as the baseline against which the transition is claimed.
  • ad hoc to paper The low-energy BdG model with a spatially modulated exchange J(r) captures the essential physics of the heterostructure
    The model is constructed for this work; its parameters are not all justified from first principles.

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Cite this review

Pith. "Pith review of Emergent ferromagnetism in the NiI$_2$-NbSe$_2$ van der Waals heterostructure." pith.science (2026). https://pith.science/paper/5CS2FJDB

@misc{pith2026260721218,
  author       = {Pith},
  title        = {Pith review of: Emergent ferromagnetism in the NiI$_2$-NbSe$_2$ van der Waals heterostructure},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/5CS2FJDB}},
  note         = {Machine review of arXiv:2607.21218}
}
abstract

Multiferroicity arising from non-collinear spin textures and strong spin-orbit interactions offers a route to magnetoelectric functionality in the monolayer limit. Although theory predicts that the properties of monolayer multiferroics can be tuned by strain, gating, or proximity effects, experimental demonstrations of such control remain scarce. Here we show that the magnetic ground state of monolayer NiI$_2$, a prototypical two-dimensional multiferroic, is altered by proximity to a superconducting NbSe$_2$ substrate. Using low-temperature scanning tunnelling microscopy (STM) and spectroscopy (STS), we show that the metallic substrate renormalizes the exchange interactions within NiI$_2$ and drives it into a ferromagnetic ground state. This can be visualized by probing the Yu-Shiba-Rusinov (YSR) states within the superconducting gap of the NbSe$_2$ substrate. Our results establish YSR states as an in situ probe of two-dimensional magnetism and demonstrate substrate engineering as a means of controlling magnetic order in atomically thin materials.

Figures

Figures reproduced from arXiv: 2607.21218 by the authors.

Figure 1
Figure 1. FIG. 1. Monolayer NiI [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2. Electronic characterization of NiI [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗

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    author author Jose L. \ Lado ,\ https://github.com/joselado/pyqula title https://github.com/joselado/pyqula , \ ( year 2026 ) NoStop

    2026

Pith tools

Reviewed August 1, 2026 · model on record in the stance chip above.