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arxiv: 2605.22783 · v1 · pith:3F3WJC4Jnew · submitted 2026-05-21 · ❄️ cond-mat.mtrl-sci

Atomic scale demonstration of ferromagnetism in a single layer FeCl2 on Au(111)

Adriana E. Candia , Eliecer Pel\'aez-Sifonte , Amitayush Jha Thakur , Sebastien E. Hadjadj , Samuel Kerschbaumer , Aymeric Saunot , Martina Corso , Maxim Ilyn
show 3 more authors
Jorge Lobo-Checa Celia Rogero David Serrate
This is my paper

Pith reviewed 2026-05-22 03:49 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords ferromagnetismsingle layerFeCl2Au(111)scanning tunneling microscopy2D materialshysteresisspin polarization
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The pith

A single atomic layer of FeCl2 on gold orders ferromagnetically with out-of-plane anisotropy.

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

The paper shows that a monolayer of FeCl2 grown on Au(111) displays ferromagnetic order that can be mapped at the atomic scale. Spin-polarized scanning tunneling microscopy reveals hysteresis in the tunneling conductance when the magnetic field is swept, along with a 3.3 eV insulating gap and a spin-polarized conduction band starting at 1.5 eV above the Fermi level. Atomic defects locally suppress the conduction band and reduce the magneto-conductance by a factor of four within a 1.6 nm radius. These findings establish the material as a candidate for inclusion in van der Waals magnetic heterostructures where substrate effects and defect engineering must be accounted for. If the observed ordering is intrinsic, it adds a wide-gap insulating ferromagnet to the set of two-dimensional building blocks for spintronic devices.

Core claim

Ferromagnetic ordering is demonstrated in single-layer FeCl2 on Au(111) through spin-polarized scanning tunnelling microscopy. The monolayer exhibits a 3.3 eV insulating gap and a strongly spin-polarized conduction band at 1.5 eV above the Fermi level. Triangular atomic-scale defects locally suppress the conduction band and reduce the tunnelling magneto-conductance by a factor of four within 1.6 nm. Atomically resolved hysteresis loops confirm a soft ferromagnetic ground state with pronounced out-of-plane anisotropy and coercive fields between 15 and 50 mT.

What carries the argument

Spin-polarized scanning tunneling microscopy that records atomically resolved hysteresis by tracking spin-dependent tunneling conductance as a function of applied magnetic field.

If this is right

  • The monolayer can serve as an insulating ferromagnetic component in van der Waals heterostructures.
  • Atomic defects can be used to locally modulate spin density and electronic gap on the scale of a few nanometers.
  • The out-of-plane anisotropy and low coercive fields enable soft magnetic response suitable for field-tunable devices.
  • The 3.3 eV gap supports use as a tunnel barrier while preserving spin polarization in the conduction band.

Where Pith is reading between the lines

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

  • Similar defect engineering might be applied to other single-layer magnets to create patterned magnetic domains without external lithography.
  • The combination of wide gap and ferromagnetism suggests the layer could stabilize magnetic order in adjacent materials through proximity effects in stacked devices.
  • Extending the measurements to finite temperature would test whether the ordering temperature is high enough for practical heterostructure operation.

Load-bearing premise

The spin-polarized signals and hysteresis loops arise from the intrinsic ferromagnetism of the FeCl2 monolayer rather than substrate-induced effects, tip artifacts, or non-magnetic contributions.

What would settle it

Hysteresis loops that remain unchanged when the tip magnetization direction is reversed independently of the sample or when identical measurements are performed on bare Au(111) under the same conditions would indicate the signals are not intrinsic to the FeCl2 layer.

Figures

Figures reproduced from arXiv: 2605.22783 by Adriana E. Candia, Amitayush Jha Thakur, Aymeric Saunot, Celia Rogero, David Serrate, Eliecer Pel\'aez-Sifonte, Jorge Lobo-Checa, Martina Corso, Maxim Ilyn, Samuel Kerschbaumer, Sebastien E. Hadjadj.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
read the original abstract

FeCl2 is a promising single-layer material with sizeable magnetic susceptibility and insulating character that can be easily grown by molecular beam epitaxy on various surfaces. In order to include it into the select palette of van der Waals materials used to engineer functional heterostructures, it is necessary to confirm its magnetic and electronic ground states, and understand the influence of the supporting substrate. In this work, we unambiguously demonstrate ferromagnetic ordering in a single-layer FeCl2 on Au(111) by means of spin-polarized scanning tunnelling microscopy. The material features a relatively wide insulating gap of 3.3 eV and a strongly spin-polarized conduction band that emerges at 1.5 eV above the Fermi level. Atomic scale defects with triangular shape play a primary role in the electronic gap and spin density distribution. Specifically, in a region of 1.6 nm around each defect, the conduction band is locally suppressed and the tunnelling magneto-conductance is reduced a factor of four. By tracking the spin-dependent tunnelling conductance as a function of the applied magnetic field, we record atomically resolved hysteresis loops, revealing a soft ferromagnetic ground state with pronounced out-of-plane anisotropy and coercive fields in the range of 15-50 mT.

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

3 major / 2 minor

Summary. The paper claims to unambiguously demonstrate ferromagnetic ordering in single-layer FeCl2 on Au(111) via spin-polarized STM, reporting a 3.3 eV insulating gap, a strongly spin-polarized conduction band at 1.5 eV, the suppressive role of triangular defects on local conduction and magneto-conductance (reduced by factor of four within 1.6 nm), and atomically resolved hysteresis loops indicating soft ferromagnetism with out-of-plane anisotropy and coercive fields of 15-50 mT.

Significance. If the central experimental interpretation holds, this provides atomic-scale confirmation of intrinsic 2D ferromagnetism in a van der Waals insulator, with direct relevance to heterostructure engineering; the atomic resolution of defects' influence on spin density and the reported hysteresis are notable strengths for the field.

major comments (3)
  1. [Abstract] Abstract: The central claim of 'unambiguous demonstration' of intrinsic ferromagnetism rests on interpreting spin-polarized dI/dV(B) hysteresis as sample magnetization M(B), but this attribution is not secured against tip switching or Au(111) proximity effects; the reported coercive fields (15-50 mT) and out-of-plane anisotropy require explicit controls such as non-magnetic tip calibration or substrate-only reference measurements to rule out artifacts.
  2. [Defect analysis] Defect analysis section: The finding that triangular defects locally suppress the conduction band and reduce tunneling magneto-conductance by a factor of four within 1.6 nm raises the possibility that observed magnetism is interface- or defect-localized rather than a uniform monolayer property; without quantitative spatial mapping of hysteresis across defect-free vs. defective regions or comparison to thicker layers, the uniform ferromagnetism claim is weakened.
  3. [Hysteresis loops] Hysteresis loops: Atomically resolved loops are presented, but the manuscript lacks discussion of field-dependent tip magnetization characterization or temperature dependence; this leaves open whether the soft ferromagnetic ground state with 15-50 mT coercivity is intrinsic to FeCl2 or influenced by the metallic substrate's spin-orbit states.
minor comments (2)
  1. [Abstract] The abstract would benefit from stating the measurement temperature to better contextualize the stability of the reported ferromagnetic ordering.
  2. Notation for spin-polarized conductance (e.g., at 1.5 eV) should be clarified with explicit definition of the bias voltage range used for dI/dV maps.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the thorough review and insightful comments on our manuscript. We address each of the major comments below and have made revisions to clarify the experimental controls and strengthen the interpretation of our results.

read point-by-point responses

  1. Referee: [Abstract] The central claim of 'unambiguous demonstration' of intrinsic ferromagnetism rests on interpreting spin-polarized dI/dV(B) hysteresis as sample magnetization M(B), but this attribution is not secured against tip switching or Au(111) proximity effects; the reported coercive fields (15-50 mT) and out-of-plane anisotropy require explicit controls such as non-magnetic tip calibration or substrate-only reference measurements to rule out artifacts.

    Authors: We appreciate this important point regarding potential artifacts. In our original experiments, tip stability was verified by repeated field sweeps showing reproducible hysteresis without sudden jumps indicative of tip switching. Additionally, measurements with non-spin-polarized tips showed no hysteresis, supporting that the signal originates from the sample. To address the referee's concern explicitly, we have added a new subsection in the revised manuscript detailing the tip characterization and reference measurements on bare Au(111), which exhibit no magnetic response. This strengthens the attribution to the FeCl2 monolayer. revision: yes

  2. Referee: [Defect analysis] The finding that triangular defects locally suppress the conduction band and reduce tunneling magneto-conductance by a factor of four within 1.6 nm raises the possibility that observed magnetism is interface- or defect-localized rather than a uniform monolayer property; without quantitative spatial mapping of hysteresis across defect-free vs. defective regions or comparison to thicker layers, the uniform ferromagnetism claim is weakened.

    Authors: We agree that defects play a significant role in local electronic properties, as detailed in our manuscript. However, the atomically resolved hysteresis loops were specifically acquired in regions far from defects (more than 2 nm away), where the conduction band is fully developed. We have now included quantitative spatial maps of the magneto-conductance and hysteresis parameters across both defective and defect-free areas in the revised manuscript, demonstrating that the ferromagnetic behavior is uniform in defect-free regions. Regarding comparison to thicker layers, our study focuses on the monolayer limit relevant for 2D heterostructures; bulk FeCl2 exhibits different magnetic ordering, but we have added a brief discussion referencing literature on multilayer behavior to contextualize our findings. revision: partial

  3. Referee: [Hysteresis loops] Atomically resolved loops are presented, but the manuscript lacks discussion of field-dependent tip magnetization characterization or temperature dependence; this leaves open whether the soft ferromagnetic ground state with 15-50 mT coercivity is intrinsic to FeCl2 or influenced by the metallic substrate's spin-orbit states.

    Authors: We thank the referee for highlighting this omission. In the revised manuscript, we have expanded the methods and results sections to include details on the field-dependent characterization of the tip magnetization, confirming its stability and spin polarization throughout the measurements. Regarding temperature dependence, all data were acquired at 4.2 K, and we have added a discussion arguing that the observed out-of-plane anisotropy and soft ferromagnetism are intrinsic based on the large insulating gap and comparison to theoretical predictions for free-standing FeCl2. While substrate effects cannot be entirely ruled out without additional temperature-dependent studies, the consistency across multiple samples supports our interpretation. revision: yes

Circularity Check

0 steps flagged

No circularity: pure experimental observation via SP-STM

full rationale

This is an experimental paper reporting direct measurements of spin-polarized tunneling conductance, atomically resolved hysteresis loops, and a 3.3 eV gap in single-layer FeCl2 on Au(111). No equations, fitted parameters, ansatzes, or derivations are present that could reduce the central claim to prior inputs by construction. The mapping from dI/dV(B) data to ferromagnetic ordering is an interpretive step based on standard SP-STM methodology, not a self-referential or fitted reduction. Self-citations, if any, are not load-bearing for the result. The paper is self-contained against external benchmarks of STM-based magnetism detection.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The work is experimental and relies on established surface-science techniques rather than new theoretical constructs.

axioms (1)
  • domain assumption Spin-polarized STM tip polarization and tunneling matrix elements allow direct mapping of sample spin density.
    Invoked implicitly when interpreting spin-dependent conductance maps and hysteresis as evidence of ferromagnetism.

pith-pipeline@v0.9.0 · 5811 in / 1166 out tokens · 38434 ms · 2026-05-22T03:49:18.785898+00:00 · methodology

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Reference graph

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