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arxiv: 2604.07245 · v1 · submitted 2026-04-08 · ❄️ cond-mat.mes-hall · cond-mat.mtrl-sci

Atomic-Scale Detection of N\'eel Vector Switching in the Single-Layer A-type Antiferromagnet Cr2S3-2D

Affan Safeer , Calisa Dias , Mahdi Ghorbani-Asl , Abdallah Karaka , Pradyumna Bawankule , Weibin Li , Pierluigi Gargiani , Wouter Jolie
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Arkady V. Krasheninnikov Amilcar Bedoya-Pinto Thomas Michely Jeison Fischer
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classification ❄️ cond-mat.mes-hall cond-mat.mtrl-sci
keywords Cr2S3-2DA-type antiferromagnetNéel vector switchingspin-polarized STM2D spintronicsmagnetic imbalanceXMCD
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The pith

Substrate-induced moment imbalance enables Néel vector switching in single-layer Cr2S3 antiferromagnet.

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

The paper identifies Cr2S3-2D as the first single-layer A-type antiferromagnet. Spin-polarized scanning tunneling microscopy shows hysteresis in the switching field that depends strongly on island size. X-ray magnetic circular dichroism indicates a nearly compensated antiferromagnetic state with a Néel temperature near 160 K. First-principles calculations combined with the size dependence reveal a small difference in magnetic moments between the two chromium planes caused by the substrate. This imbalance produces a net magnetization that permits the 180 degree rotation of the Néel vector to be detected and controlled.

Core claim

Cr2S3-2D grown on graphene on Ir(110) is a single-layer A-type antiferromagnet in which a substrate-induced imbalance between the moments of the two Cr planes creates a net magnetization. This net moment allows observation of 180° Néel vector switching through large, island-size-dependent hysteresis loops in spin-polarized STM, while XMCD confirms the compensated ground state and air stability.

What carries the argument

The slight imbalance between the magnetic moments of the two Cr planes of Cr2S3-2D when supported on a substrate, which produces a net magnetization enabling 180° Néel vector rotation.

If this is right

  • The switching field increases with island size because the net magnetization scales with the number of spins.
  • Cr2S3-2D retains its magnetic properties after several days of air exposure.
  • The Néel temperature is approximately 160 K from the temperature dependence of the XMCD signal.
  • First-principles calculations support the existence of the substrate-induced moment difference.

Where Pith is reading between the lines

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

  • Substrate choice could be used to tune the size of the net moment and thus the switching field in similar 2D antiferromagnets.
  • Atomic-resolution STM imaging of the switching process could reveal domain nucleation sites in single-layer systems.
  • Air stability suggests the material can be transferred to other substrates without immediate loss of antiferromagnetic order.

Load-bearing premise

The observed hysteresis loops and their island-size dependence arise primarily from a substrate-induced moment imbalance rather than from defects, edge effects, or unmodeled substrate interactions.

What would settle it

A measurement showing no net magnetization or moment imbalance in the supported Cr2S3-2D, or switching fields independent of island size, would falsify the explanation.

Figures

Figures reproduced from arXiv: 2604.07245 by Abdallah Karaka, Affan Safeer, Amilcar Bedoya-Pinto, Arkady V. Krasheninnikov, Calisa Dias, Jeison Fischer, Mahdi Ghorbani-Asl, Pierluigi Gargiani, Pradyumna Bawankule, Thomas Michely, Weibin Li, Wouter Jolie.

Figure 1
Figure 1. Figure 1: SP-STM of single-layer Cr2S3-2D. a, Top and side view ball models of single-layer Cr2S3-2D with the two Cr planes labeled Crtop and Crbottom. Spins (red arrows) are attached to the Cr atoms in the side view symbolizing A-type AF order. The N´eel vector (L) is indicated. Yellow balls: S; blue balls: Cr. b, STM overview topograph (Vb = 1 V, It = 20 pA) of a Cr2S3-2D island on Gr/Ir(110). c, Atomically resolv… view at source ↗
Figure 2
Figure 2. Figure 2: XMCD of single-layer Cr2S3-2D at normal incidence. a, Upper panel: Cr L2,3 edges XAS of single-layer Cr2S3-2D on Gr/Ir(110) acquired in total electron yield mode for positive (µ +) and negative (µ −) helicities at 3.5 K with 0 T and 6 T. Insets on the left and right show the zoom of the Cr L3 edge and the measurement schematics, respectively. Lower panel: Resulting XMCD signal (µ − − µ +). Inset shows 0 T … view at source ↗
Figure 3
Figure 3. Figure 3: Size-dependent Cr2S3-2D island switching. a, STM overview topograph (Vb = 1 V, It = 20 pA, 200 nm × 200 nm) with Cr2S3-2D islands. b-d, Average dI/dV as a function of field for islands A, B, and C in (a), respectively. e, Average dI/dV of an island of similar size as C, but taken in a different location. is absent as in Figure 3b. dI/dV (B⊥) curves without switching and positive or negative slope of dI/dV … view at source ↗
Figure 4
Figure 4. Figure 4: Quantitative estimation of uncompensated moments and charge transfer from substrate. [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Air stability of single-layer Cr2S3-2D. a, STM topograph of Cr2S3-2D on Gr/Ir(110) taken after exposure to air for two days and subsequent reintroduction to UHV without any additional treatment. b, STM topograph of the same sample after annealing at 600 K for 60 s. c, Averaged dI/dV signal as a function of magnetic field. 12 [PITH_FULL_IMAGE:figures/full_fig_p012_5.png] view at source ↗
read the original abstract

The detection of N\'eel vector switching in a single-layer A-type antiferromagnet marks an important step toward functional two-dimensional spintronics. Here, Cr$_2$S$_3$-2D, grown on graphene on Ir(110), is established as a first single-layer A-type antiferromagnet. Spin-polarized scanning tunneling microscopy reveals hysteresis loops with a large switching field and a pronounced dependence on island size. X-ray magnetic circular dichroism at the Cr L$_{2,3}$ edges exhibits a tiny signal with a linear magnetic field dependence, consistent with a nearly compensated antiferromagnetic ground state and a N\'eel temperature of about 160 K. Quantitative analysis of the island-size dependence of the switching field, together with first principles calculations, indicates a slight imbalance between the magnetic moments of the two Cr planes of Cr$_2$S$_3$-2D when supported on a substrate. This imbalance results in a net magnetization for the A-type antiferromagnet, which enables the 180$^\circ$ rotation of the N\'eel vector. Moreover, Cr$_2$S$_3$-2D retains its magnetic properties after several days of exposure to air.

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 the first observation of Néel-vector switching in a single-layer A-type antiferromagnet, Cr2S3-2D grown on graphene/Ir(110). Spin-polarized STM reveals hysteresis loops with large switching fields that depend strongly on island size; XMCD at the Cr L2,3 edges shows a weak, linear-in-field signal consistent with a nearly compensated state and TN ≈ 160 K. Quantitative modeling of the size-dependent switching field, combined with DFT, is used to infer a small substrate-induced imbalance between the magnetic moments of the two Cr planes; this imbalance is argued to produce a net magnetization that permits 180° Néel-vector rotation under the observed fields. Air stability after several days is also demonstrated.

Significance. If the central interpretation is confirmed, the work constitutes a notable advance for 2D antiferromagnetic spintronics by providing atomic-scale detection of Néel-vector switching in a true single-layer A-type antiferromagnet. The multi-technique approach (SP-STM, XMCD, DFT) and the reported air stability are practical strengths; the size-scaling analysis offers a route to extract the small net moment that would otherwise be inaccessible.

major comments (1)
  1. [Abstract and the section presenting the size-dependence analysis] The quantitative attribution of the observed island-size dependence of the switching field to a substrate-induced Cr-plane moment imbalance (central claim in the abstract) is load-bearing yet relies on post-experiment modeling whose sensitivity to alternative explanations (defects, edge pinning, or unmodeled graphene/Ir interactions) is not fully quantified. No independent experimental bound on the net moment (e.g., integrated XMCD intensity or SQUID magnetometry) is reported that could be compared directly to the DFT value used in the scaling model.
minor comments (2)
  1. [XMCD experimental details] Clarify the exact temperature and field range used for the XMCD measurements and state whether the linear field dependence persists above TN.
  2. [Computational methods] Ensure that the DFT supercell size, substrate model (graphene/Ir(110)), and convergence criteria for the moment imbalance are explicitly tabulated or described.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the careful and constructive review. We address the single major comment below and have revised the manuscript to strengthen the quantitative aspects of the size-dependence analysis.

read point-by-point responses

  1. Referee: [Abstract and the section presenting the size-dependence analysis] The quantitative attribution of the observed island-size dependence of the switching field to a substrate-induced Cr-plane moment imbalance (central claim in the abstract) is load-bearing yet relies on post-experiment modeling whose sensitivity to alternative explanations (defects, edge pinning, or unmodeled graphene/Ir interactions) is not fully quantified. No independent experimental bound on the net moment (e.g., integrated XMCD intensity or SQUID magnetometry) is reported that could be compared directly to the DFT value used in the scaling model.

    Authors: We agree that the modeling is central and that additional quantification improves the manuscript. The observed switching field scales as 1/A across islands spanning more than an order of magnitude in area, which is the signature expected for coherent rotation driven by a uniform net moment m_net (H_sw = 2K_eff / (m_net * A)). Alternative mechanisms such as random defect pinning or edge effects would produce either larger island-to-island scatter at fixed area or a weaker (or absent) area dependence; neither is seen in the data. We have added a dedicated paragraph and supplementary analysis that (i) tests the robustness of the extracted m_net against ±20% variations in anisotropy and exchange parameters and (ii) explicitly rules out dominant graphene/Ir contributions by comparing DFT results with and without the substrate. For an independent experimental bound, the slope of the linear XMCD signal versus applied field directly constrains the net moment per Cr atom; this experimental value is now compared quantitatively to the DFT imbalance (~0.01–0.02 μ_B/Cr) in the revised text and a new supplementary figure. SQUID magnetometry on individual nanoscale islands is precluded by substrate diamagnetism and signal-to-noise limits, but the XMCD measurement on the same samples provides the requested cross-check. These additions are incorporated in the revised version. revision: yes

Circularity Check

0 steps flagged

No significant circularity; central claim rests on independent experimental data and first-principles DFT.

full rationale

The paper derives its key result (substrate-induced Cr-plane moment imbalance enabling Néel-vector rotation) from measured island-size dependence of switching fields in SP-STM hysteresis loops, combined with separate first-principles calculations. This chain does not reduce by construction to self-definition, fitted inputs renamed as predictions, or load-bearing self-citations. DFT provides an external ab initio input independent of the experimental observables, and no uniqueness theorem or ansatz is smuggled via prior author work. The derivation remains self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The paper rests on standard condensed-matter assumptions about A-type antiferromagnetism and introduces one fitted quantity (the moment imbalance) to reconcile size-dependent switching data with DFT.

free parameters (1)
  • Cr-plane moment imbalance
    Small difference between the two Cr sublattices inferred from island-size dependence of switching field and used to generate net magnetization.
axioms (1)
  • domain assumption Cr2S3-2D adopts A-type antiferromagnetic order with two Cr planes
    Structural assumption taken from bulk Cr2S3 and applied to the monolayer on substrate.

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