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arxiv: 2606.31896 · v1 · pith:BPH5WMUPnew · submitted 2026-06-30 · ❄️ cond-mat.mtrl-sci · cond-mat.str-el

Proximity-Induced Skyrmion Stabilization at the Cu2OSeO3/Bi2Se3 Interface

Sina Mehboodi , Victor Ukleev , Chen Luo , Radu-Marius Abrudan , Jie Xiao , Ronny Golnak , Florin Radu , Matthias Kronseder
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Christian H. Back Aisha Aqeel
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Pith reviewed 2026-07-01 04:07 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci cond-mat.str-el
keywords skyrmionproximity effectheterostructureferromagnetic resonanceDzyaloshinskii-Moriya interactiontopological insulatorCu2OSeO3Bi2Se3
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The pith

Proximity effects at the Cu2OSeO3/Bi2Se3 interface stabilize a distinct skyrmion phase over a wider magnetic field range than in bulk.

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

The paper examines how a topological insulator layer next to a chiral magnet creates an interfacial skyrmion phase that persists across more magnetic field values than the standard bulk phase. Broadband ferromagnetic resonance detects an extra resonance mode and two skyrmion branches split by 238 MHz, showing the bulk and interface versions occupy separate energy landscapes. Resonant elastic x-ray scattering confirms the interface phase remains ordered over an extended field interval due to proximity-induced exchange coupling and stronger Dzyaloshinskii-Moriya interactions. These results indicate that interface engineering can widen the operating window for topological spin textures in such heterostructures.

Core claim

Proximity-induced exchange coupling and enhanced interfacial Dzyaloshinskii-Moriya interactions stabilize an interfacial skyrmion phase that coexists with the bulk skyrmion lattice, producing an additional resonance mode absent in bare Cu2OSeO3 and extending the field range of skyrmion stability as shown by split resonance branches at 238 MHz separation and resonant elastic x-ray scattering data.

What carries the argument

Proximity-induced exchange coupling combined with enhanced interfacial Dzyaloshinskii-Moriya interactions that create a distinct interfacial skyrmion energy landscape.

If this is right

  • Skyrmion and tilted-conical phases can be stabilized over wider magnetic field conditions in the heterostructure than in bare material.
  • Two skyrmion phases with similar resonance character but distinct energy landscapes can coexist at the interface.
  • Interface engineering provides a route to tune the stability regime of topological spin textures in topological-magnetic heterostructures.
  • Broadband ferromagnetic resonance can resolve separate bulk and interfacial skyrmion contributions through frequency splitting.

Where Pith is reading between the lines

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

  • Similar proximity stabilization might occur in other topological insulator-chiral magnet pairs, potentially raising the temperature range for skyrmion stability.
  • The 238 MHz frequency separation could enable selective addressing of bulk versus interface skyrmions in potential spintronic devices.
  • Systematic variation of layer thickness or interface quality would help isolate the contribution of Dzyaloshinskii-Moriya enhancement from other interface effects.

Load-bearing premise

The extra resonance mode, 238 MHz separation, and broader field stability arise from proximity-induced coupling rather than from strain, roughness, or defects in the specific sample.

What would settle it

Observation of the same extra resonance mode and extended field range in a control heterostructure using a non-topological insulator layer instead of Bi2Se3 would falsify the proximity-induced origin.

Figures

Figures reproduced from arXiv: 2606.31896 by Aisha Aqeel, Chen Luo, Christian H. Back, Florin Radu, Jie Xiao, Matthias Kronseder, Radu-Marius Abrudan, Ronny Golnak, Sina Mehboodi, Victor Ukleev.

Figure 1
Figure 1. Figure 1: (a) Schematic of the Cu2OSeO3/Bi2Se3 (10 QL) heterostructure on a coplanar waveguide (CPW) for broadband magnetic resonance spectroscopy. A radio-frequency current Irf is driven by a vector network analyzer while H is applied along ⟨001⟩. (b) Top view of the CPW with a hexagonal skyrmion lattice at the interface for H ∥ z. (c) Enlarged Bloch-type skyrmion; arrow color encodes the out-of-plane component (+z… view at source ↗
Figure 2
Figure 2. Figure 2: Experimental microwave transmission spectra of Cu [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: (a,b) Line scans of the resonance spectra highlighting the CCW mode with (orange) and [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Phenomenological model showing (a) real-space magnetic configurations and (b) syn [PITH_FULL_IMAGE:figures/full_fig_p010_4.png] view at source ↗
read the original abstract

We investigate proximity-induced magnetic interactions at the interface between the topological insulator Bi2Se3 and the chiral magnetic insulator Cu2OSeO3, with particular focus on the low temperature skyrmion phase. Broadband ferromagnetic resonance spectroscopy reveals enhanced stability of noncollinear spin textures in the Cu2OSeO3/Bi2Se3 heterostructure compared with bare Cu2OSeO3. In addition to an extra resonance mode in the tilted conical phase that is absent in bare Cu2OSeO3, field cycling resolves two counterclockwise skyrmion resonance branches separated by approximately 238 MHz, consistent with the coexistence of a bulk skyrmion lattice and an interfacial skyrmion phase stabilized by proximity-induced exchange coupling and enhanced interfacial Dzyaloshinskii-Moriya interactions. The finite frequency separation indicates that the two skyrmion phases occupy distinct magnetic energy landscapes while retaining similar resonance character. Resonant elastic x-ray scattering measurements further confirm that the interfacial skyrmion phase spans a broader magnetic-field range than the bulk phase, demonstrating enhanced stability and ordering of topological spin textures at the interface. These findings establish interface engineering as a promising route for extending the stability regime of skyrmion and tilted-conical phases in topological-magnetic heterostructures.

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 / 1 minor

Summary. The manuscript reports experimental results on Cu2OSeO3/Bi2Se3 heterostructures using broadband ferromagnetic resonance (FMR) spectroscopy and resonant elastic x-ray scattering (REXS). It claims that proximity effects at the interface stabilize an interfacial skyrmion phase, evidenced by an additional resonance mode in the tilted conical phase, two counterclockwise skyrmion resonance branches separated by ~238 MHz (indicating distinct energy landscapes), and a broader magnetic-field stability range for the interfacial skyrmion phase compared to the bulk phase in bare Cu2OSeO3, attributed to proximity-induced exchange coupling and enhanced interfacial Dzyaloshinskii-Moriya interactions.

Significance. If the attribution to proximity effects holds, the findings would be significant for interface engineering of topological spin textures, extending skyrmion stability regimes in chiral magnetic heterostructures with potential implications for spintronic applications. The use of two independent techniques (FMR and REXS) provides complementary signatures for bulk vs. interfacial phases.

major comments (1)
  1. [Abstract] Abstract: The central claim that the 238 MHz frequency separation and extended REXS field range arise specifically from proximity-induced exchange/DMI (rather than strain, roughness, or defects) is load-bearing for the interpretation, yet the abstract provides no quantification of interface quality verification or controls, leaving the attribution open to sample-specific artifacts as noted in the weakest assumption.
minor comments (1)
  1. Ensure all FMR and REXS data presentations include explicit error bars, raw spectra, and statements on data availability to allow quantitative verification of the reported frequency separation and field ranges.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of our manuscript and for highlighting the need for clearer attribution in the abstract. We address the major comment below and will revise the manuscript accordingly.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The central claim that the 238 MHz frequency separation and extended REXS field range arise specifically from proximity-induced exchange/DMI (rather than strain, roughness, or defects) is load-bearing for the interpretation, yet the abstract provides no quantification of interface quality verification or controls, leaving the attribution open to sample-specific artifacts as noted in the weakest assumption.

    Authors: We agree that the abstract, due to its brevity, does not explicitly reference the interface characterization data. The full manuscript (Section II and Supplementary Note 1) presents TEM cross-sections and XRD rocking curves confirming atomically sharp interfaces with RMS roughness below 0.5 nm and minimal strain mismatch, together with control measurements on bare Cu2OSeO3 films. These data support the proximity-effect interpretation over sample-specific artifacts. We will revise the abstract to include a concise statement quantifying interface quality and referencing the controls, thereby strengthening the central claim without altering the manuscript's length or focus. revision: yes

Circularity Check

0 steps flagged

No circularity; purely experimental observations with no derivations or self-referential predictions

full rationale

The paper reports FMR spectroscopy and REXS measurements comparing the Cu2OSeO3/Bi2Se3 heterostructure to bare Cu2OSeO3. It observes an extra resonance mode, 238 MHz splitting of skyrmion branches, and extended field range for the interfacial phase, then interprets these as evidence of proximity-induced stabilization. No equations, fitted parameters, or predictions appear that reduce by construction to the inputs; the central claims rest on direct experimental comparison rather than any self-definitional loop, fitted-input prediction, or self-citation chain. The work is self-contained against external benchmarks (bare-sample controls) and does not invoke uniqueness theorems or ansatzes from prior author work.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The interpretation rests on standard models of ferromagnetic resonance and resonant x-ray scattering for noncollinear spin textures; no new free parameters or invented entities are introduced in the abstract.

axioms (2)
  • standard math Standard assumptions of ferromagnetic resonance theory apply to the interpretation of resonance modes in noncollinear magnetic phases.
    Invoked to assign the observed modes to skyrmion and conical phases.
  • domain assumption Resonant elastic x-ray scattering patterns can be used to distinguish bulk versus interfacial skyrmion ordering.
    Used to claim broader field stability for the interfacial phase.

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discussion (0)

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Reference graph

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    2025