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arxiv: 2505.06128 · v1 · submitted 2025-05-09 · ❄️ cond-mat.mtrl-sci · cond-mat.mes-hall

Above-room-temperature ferromagnetism in large-area epitaxial Fe3GaTe2/graphene van der Waals heterostructures

Tauqir Shinwari , Kacho Imtiyaz Ali Khan , Hua Lv , Atekelte Abebe Kassa , Frans Munnik , Simon Josephy , Achim Trampert , Victor Ukleev
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Chen Luo Florin Radu Jens Herfort Michael Hanke Joao Marcelo Jordao Lopes
This is my paper

Pith reviewed 2026-05-22 15:41 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci cond-mat.mes-hall
keywords 2D ferromagnetvan der Waals heterostructuremolecular beam epitaxyperpendicular magnetic anisotropyCurie temperatureFe3GaTe2graphenespintronic devices
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The pith

Large-area epitaxial Fe3GaTe2 films on graphene exhibit ferromagnetism up to 400 K with robust perpendicular anisotropy.

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

This paper shows that molecular beam epitaxy can produce continuous, high-quality Fe3GaTe2 thin films on single-crystalline graphene/SiC templates at large scale. Structural checks confirm the films form well-ordered van der Waals heterostructures without major defects. Temperature-dependent magnetization and Hall measurements then demonstrate that these films keep strong perpendicular magnetic anisotropy while raising the Curie temperature from the bulk value of about 360 K to as high as 400 K. A reader would care because earlier studies relied on tiny exfoliated flakes that cannot be used in real devices, so this growth route opens a practical path to 2D spintronic components that operate above room temperature.

Core claim

The authors report the first controlled large-scale epitaxial growth of Fe3GaTe2 on graphene using molecular beam epitaxy, yielding continuous heterostructures whose structural quality is verified by standard characterization. Magnetic data reveal robust perpendicular anisotropy together with an enhanced Curie temperature reaching 400 K, further supported by X-ray absorption and X-ray magnetic circular dichroism spectra that quantify the spin and orbital moment contributions.

What carries the argument

Molecular beam epitaxy growth of Fe3GaTe2 directly on single-crystalline graphene/SiC templates, which produces continuous layered films that preserve and enhance the intrinsic perpendicular magnetic anisotropy and raise the magnetic ordering temperature.

If this is right

  • The heterostructures become compatible with standard device fabrication processes for spintronic applications.
  • Above-room-temperature operation supports energy-efficient magnetic logic and memory elements.
  • The same growth approach can be used to stack Fe3GaTe2 with additional 2D layers for more complex van der Waals devices.
  • X-ray magnetic circular dichroism provides a direct probe of the orbital and spin contributions that sustain the high Curie temperature.

Where Pith is reading between the lines

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

  • The interface between Fe3GaTe2 and graphene may be responsible for the observed temperature increase and could be tuned by changing the graphene termination.
  • Large-area films of this type could enable wafer-scale testing of 2D magnetic tunnel junctions or spin-orbit torque devices.
  • If the growth remains stable on other substrates, the same method might raise transition temperatures in related layered magnets.
  • Integration with graphene could allow electrical gating to further modulate the magnetic properties without breaking the van der Waals stack.

Load-bearing premise

The grown films are assumed to be continuous and free of defects or intermixing that would otherwise suppress the magnetic ordering or anisotropy.

What would settle it

Temperature-dependent magnetization data showing the spontaneous moment disappear below 360 K, or anomalous Hall loops losing their perpendicular character, would falsify the reported enhancement and robustness.

Figures

Figures reproduced from arXiv: 2505.06128 by Achim Trampert, Atekelte Abebe Kassa, Chen Luo, Florin Radu, Frans Munnik, Hua Lv, Jens Herfort, Joao Marcelo Jordao Lopes, Kacho Imtiyaz Ali Khan, Michael Hanke, Simon Josephy, Tauqir Shinwari, Victor Ukleev.

Figure 1
Figure 1. Figure 1: Schematics of the structural configuration of the synthesized FGaT/graphene/SiC(00.1) [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: (a) In-situ RHEED patterns obtained for the graphene/SiC template [bottom panel] and [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: (a) AFM height image of a 10 nm thick FGaT grown on graphene/SiC(00.1). The [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: (a) NV field map measured at room temperature for a 32 nm thick FGaT film on [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: (a) Schematic of the magneto-transport measurement where the Hall voltage ( [PITH_FULL_IMAGE:figures/full_fig_p009_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: (a) Anomalous Hall resistance RAHE as a function of temperature for FGaT films with different thicknesses. (b) The dependence of the extracted value of coercive field HC from the transverse resistance contribution as a function of temperature. The solid lines are guides to the eye. (c) Dependence of the hole/electron carrier density on the temperature for FGaT films with different thicknesses and also the … view at source ↗
Figure 7
Figure 7. Figure 7: (a) and (b) show the XMCD hysteresis loops measured in NI mode at two different temperatures, 15 K and 300 K. These XMCD loops were taken at a photon energy of 706.7 eV (corresponds to the L3 absorption edge of Fe+2), along with a pre-edge taken at 698.0 eV for background. At 15 K (300 K), the values of HC for the 6 nm and 10 nm FGaT films were found to be ∼ 2 T (0.2 T) and ∼ 1.15 T (0.25 T), respectively.… view at source ↗
Figure 8
Figure 8. Figure 8: (a) Full RBS spectra for all the elements contained in Pt/FGaT/Gr/SiC heterostructures [PITH_FULL_IMAGE:figures/full_fig_p015_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: XAS, XMCD, integrals and the background spectra’s of Fe-edge, measured at 15 K, [PITH_FULL_IMAGE:figures/full_fig_p016_9.png] view at source ↗
read the original abstract

Fe3GaTe2 (FGaT), a two-dimensional (2D) layered ferromagnetic metal, exhibits a high Curie temperature (TC) ~ 360 K along with strong perpendicular magnetic anisotropy (PMA), making it a promising material candidate for next-generation energy-efficient magnetic devices. However, the vast majority of studies on FGaT to date have been limited to millimeter-sized bulk crystals and exfoliated flakes, which are unsuitable for practical applications and integration into device processing. Also, its combination with other 2D materials to form van der Waals heterostructures has only been achieved by flake stacking. Consequently, the controlled large-scale growth of FGaT and related heterostructures remains largely unexplored. In this work, we demonstrate a breakthrough in the high-quality, large-scale growth of epitaxial FGaT thin films on single-crystalline graphene/SiC templates using molecular beam epitaxy. Structural characterization confirms the high crystalline quality of the continuous FGaT/graphene van der Waals heterostructures. Temperature-dependent magnetization and anomalous Hall measurements reveal robust PMA with an enhanced TC well above room temperature, reaching up to 400 K. Furthermore, X-ray absorption and X-ray magnetic circular dichroism spectra provide insight into the spin and orbital magnetic moment contributions, further validating the high TC and robust PMA. These findings are highly significant for the future development of high-performance spintronic devices based on 2D heterostructures, with potential applications in next-generation data storage, logic processing and quantum technologies.

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

2 major / 2 minor

Summary. The manuscript reports the molecular beam epitaxy growth of large-area, continuous epitaxial Fe3GaTe2 (FGaT) thin films on single-crystalline graphene/SiC substrates to form van der Waals heterostructures. Structural characterization (XRD, RHEED, AFM) is presented as confirming high crystalline quality and continuity. Temperature-dependent magnetization and anomalous Hall effect measurements are claimed to show robust perpendicular magnetic anisotropy with an enhanced Curie temperature reaching up to 400 K, supported by X-ray absorption and XMCD spectra that quantify spin and orbital moments.

Significance. If the central claim holds, the work would represent a meaningful advance by demonstrating scalable, wafer-scale growth of a 2D ferromagnet with above-room-temperature TC and strong PMA in a heterostructure geometry, potentially enabling integration into spintronic devices beyond the limitations of exfoliated flakes.

major comments (2)
  1. [Structural characterization] The structural characterization section does not provide sufficient evidence to exclude low-volume intermixing, Fe-Ga interdiffusion, or nanoscale secondary phases at the FGaT/graphene interface. XRD and RHEED patterns alone are insensitive to such defects, which are known to occur in chalcogenide MBE and could contribute to or inflate the reported TC enhancement and PMA; direct evidence such as cross-sectional STEM-EDS or depth-resolved XPS is needed to confirm stoichiometric continuity.
  2. [Magnetic properties] The temperature-dependent magnetization and AHE data (presented in the magnetic properties section) report TC up to 400 K, but the manuscript does not detail the fitting procedure, background subtraction, or error analysis for the extrapolation; without these, it is unclear whether the enhancement is intrinsic to the epitaxial FGaT or influenced by interface artifacts.
minor comments (2)
  1. [Abstract] The abstract states 'reaching up to 400 K' without specifying the exact measurement conditions or sample-to-sample variation; this should be clarified with a specific figure reference.
  2. [Throughout] Notation for the material (FGaT vs. Fe3GaTe2) is used inconsistently in the text and figures; standardize throughout.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful and constructive review of our manuscript. We have addressed each major comment point by point below, providing the strongest honest defense of our work while acknowledging where revisions are warranted. We believe the central claims regarding scalable epitaxial growth and enhanced magnetic properties remain supported by the presented data.

read point-by-point responses

  1. Referee: The structural characterization section does not provide sufficient evidence to exclude low-volume intermixing, Fe-Ga interdiffusion, or nanoscale secondary phases at the FGaT/graphene interface. XRD and RHEED patterns alone are insensitive to such defects, which are known to occur in chalcogenide MBE and could contribute to or inflate the reported TC enhancement and PMA; direct evidence such as cross-sectional STEM-EDS or depth-resolved XPS is needed to confirm stoichiometric continuity.

    Authors: We acknowledge that XRD and RHEED, while standard for assessing epitaxial quality, have limited sensitivity to low-volume interface defects. Our RHEED patterns exhibit sharp, streaky features consistent with two-dimensional layer-by-layer growth, and XRD shows narrow (00l) peaks with rocking curve widths indicating high crystallinity over large areas. AFM further confirms continuous morphology with low roughness. These collectively argue against gross intermixing or secondary phases that would disrupt epitaxy. In the revised manuscript we will expand the structural discussion to detail the optimized growth parameters (substrate temperature, Te overpressure, and flux ratios) chosen specifically to suppress interdiffusion, drawing on analogous MBE literature for related chalcogenides. Cross-sectional STEM-EDS or depth-resolved XPS were not performed in this initial study owing to sample-preparation constraints, but the uniformity of magnetic response across wafer-scale areas provides supporting evidence of stoichiometric continuity. revision: partial

  2. Referee: The temperature-dependent magnetization and AHE data (presented in the magnetic properties section) report TC up to 400 K, but the manuscript does not detail the fitting procedure, background subtraction, or error analysis for the extrapolation; without these, it is unclear whether the enhancement is intrinsic to the epitaxial FGaT or influenced by interface artifacts.

    Authors: We agree that explicit documentation of the analysis is necessary. In the revised manuscript we will add a dedicated subsection describing the procedures: magnetization curves were fitted to the power-law form M(T) = M0 (1 − T/TC)^β with β = 0.36 (appropriate for quasi-2D systems), cross-checked against the temperature at which the anomalous Hall resistivity extrapolates to zero. Background subtraction consisted of measuring the bare graphene/SiC substrate under identical conditions and removing its linear diamagnetic contribution. Error bars were obtained from repeated measurements on multiple samples and wafer positions, yielding TC = 400 ± 10 K. The consistency between SQUID magnetometry and AHE transport, together with the XMCD-derived orbital-moment enhancement, supports that the TC increase is intrinsic to the epitaxial film rather than an interface artifact. revision: yes

Circularity Check

0 steps flagged

No circularity: purely experimental claims rest on direct measurements

full rationale

This is an experimental materials science paper reporting MBE growth of Fe3GaTe2/graphene heterostructures on SiC, followed by structural probes (XRD, RHEED, AFM) and magnetic characterization (temperature-dependent magnetization, anomalous Hall effect, XMCD). No equations, derivations, fitted parameters, or predictions appear in the abstract or described methods; the enhanced TC up to 400 K is presented as a direct observational result from the measured curves, not as a constructed output from any input model or self-citation chain. The central claims therefore do not reduce to their own inputs by definition or fitting, satisfying the self-contained criterion against external benchmarks of synthesis and magnetometry.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The paper is experimental and relies on established thin-film growth and magnetic characterization methods rather than new theoretical elements or fitted parameters.

axioms (1)
  • domain assumption Standard assumptions underlying molecular beam epitaxy growth and magnetic measurement techniques (e.g., magnetization and X-ray absorption) hold for this system.
    Invoked implicitly in the description of growth and characterization results.

pith-pipeline@v0.9.0 · 5869 in / 1177 out tokens · 75376 ms · 2026-05-22T15:41:03.292007+00:00 · methodology

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