arxiv: 2604.07653 · v1 · submitted 2026-04-08 · ❄️ cond-mat.mtrl-sci

Recognition: unknown

Strain continuously rotates the N\'eel vector in altermagnetic MnTe

Alex Liebman-Pel\'aez , Jon Kruppe , Resham Babu Regmi , Nirmal J. Ghimire , Yue Sun , Igor I. Mazin , Hilary M. L. Noad , James Analytis

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Veronika Sunko Joseph Orenstein

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Pith reviewed 2026-05-10 16:54 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci

keywords altermagnetismMnTeNéel vectorstrain tuningmagneto-opticalantiferromagnetmagnetic symmetryspintronics

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The pith

Strain continuously rotates the Néel vector in altermagnetic MnTe, tuning magnetic symmetry via its orientation.

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

The paper shows through magneto-optical measurements on MnTe single crystals that applied strain primarily rotates the Néel vector continuously instead of just forming single domains with help from magnetic fields. This rotation changes the magnetic point group symmetry set by the vector's direction, which in turn adjusts related physical properties. The work also finds that built-in strain in free-standing crystals can lock the vector into continuous textures spanning millimeter distances. These observations point toward using the Néel vector's orientation as a controllable handle in spintronic devices.

Core claim

Strain acts primarily to rotate the Néel vector L continuously in altermagnetic MnTe. Because the vector's orientation fixes the magnetic point group symmetry, this rotation provides continuous tuning of symmetry and the physical properties it controls. Magneto-optical data confirm the rotation under applied strain, while built-in strain in free-standing crystals pins L into large-scale continuous textures.

What carries the argument

The Néel vector L, whose continuous rotation under strain is tracked by magneto-optical signals and directly sets the magnetic point group symmetry.

Load-bearing premise

Magneto-optical signals track only the Néel vector orientation and carry no extra contributions from strain-induced birefringence, domain walls, or other textures.

What would settle it

Simultaneous measurements of the magneto-optical Kerr signal and an independent probe such as neutron diffraction or resonant X-ray scattering on the same strained MnTe crystal, looking for any mismatch in the inferred Néel vector direction.

Figures

Figures reproduced from arXiv: 2604.07653 by Alex Liebman-Pel\'aez, Hilary M. L. Noad, Igor I. Mazin, James Analytis, Jon Kruppe, Joseph Orenstein, Nirmal J. Ghimire, Resham Babu Regmi, Veronika Sunko, Yue Sun.

**Figure 2.** Figure 2: a, we show a schematic of the applied strain experiment. Samples were cut into bars and loaded into a Razorbill CS130 piezoelectric strain cell. The sample was [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗

**Figure 3.** Figure 3: FIG. 3. Strain evolution of [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗

**Figure 4.** Figure 4: e. Furthermore, ∆ is constant across the majority of the sample, indicating that the variation in ϕ0 primarily reflects variations in the Néel vector orientation rather than averaging over symmetry-locked domains (Fig. S3). In Fig. 4f we show the collapse of MCD/∆3/2 onto Eq. (1) across the whole sample, similar to the case of deliberately applied strain. Points are colored according to their respective … view at source ↗

read the original abstract

Altermagnetism has recently emerged as a distinct class of collinear antiferromagnets that break time-reversal symmetry, exhibiting a host of novel properties. Applied strain has attracted particular attention as a key tuning parameter for altermagnets. Although several experimental studies have demonstrated the preparation of single-domain states through a combination of applied strain and magnetic field, the route to such states remains unclear. Here, we use magneto-optical measurements on single crystals of MnTe under applied strain to show that, in contrast to previous reports, strain acts primarily to rotate the N\'eel vector L continuously. Since the orientation of L determines the magnetic point group symmetry, this continuous rotation effectively tunes the symmetry and its associated physical properties. Furthermore, we demonstrate that built-in strain in free-standing crystals is sufficient to pin L into continuous textures over millimeter length scales. Together, these results provide guidance for future device design and open the door to leveraging the N\'eel vector orientation as a tunable degree of freedom in spintronic applications.

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.

Desk Editor's Note private letter to a colleague

The paper shows strain can rotate the Néel vector continuously in MnTe rather than just selecting domains, but the magneto-optical mapping still needs checks for strain birefringence.

read the letter

The main takeaway is that uniaxial strain rotates the Néel vector L continuously in altermagnetic MnTe, which lets you tune the magnetic point group symmetry in a continuous way instead of flipping between discrete states. They back this with magneto-optical data on single crystals and add that built-in strain in free-standing samples can lock L into textures over millimeter scales. That last part is practical for thinking about real devices. The continuous-rotation result is new relative to the domain-preparation work cited in the abstract, and the scale of the textures gives a concrete handle for applications. The symmetry-tuning angle follows directly once you accept the rotation claim, so the paper does a clean job laying out why this matters for spintronics. The soft spot sits in the optical interpretation. MnTe is birefringent, and applied strain can produce linear dichroism on its own; without explicit subtraction (temperature sweeps above TN or tensor modeling), the signal could contain a non-magnetic component that mimics or adds to the magnetic contrast used to track L angle. The abstract does not spell out those controls, so the central mapping from intensity to continuous rotation angle remains under-constrained on the evidence shown. If the full methods section has clean high-temperature references or quantitative decoupling, that would close the gap. This work is aimed at researchers already following altermagnets and strain control in antiferromagnets. Someone looking for new tuning knobs or device-scale textures will find the results useful even if they want to see the optical analysis tightened. It deserves a serious referee because the experimental platform is straightforward and the claim, if solid, moves the field forward. I would send it to review but ask the referees to focus on whether the magneto-optical data fully isolate the magnetic contribution.

Referee Report

3 major / 2 minor

Summary. The manuscript reports magneto-optical measurements on MnTe single crystals under uniaxial strain. It claims that, contrary to prior work on single-domain preparation, strain primarily rotates the Néel vector L continuously rather than switching between discrete orientations. Because L orientation sets the magnetic point group, this rotation is presented as a means to continuously tune symmetry and associated properties. The work also reports that built-in strain in free-standing crystals stabilizes continuous L textures over millimeter length scales.

Significance. If the central interpretation is correct, the result would position strain as a continuous tuning parameter for altermagnetic order parameters in MnTe, with direct implications for symmetry-controlled spintronic devices. The observation of large-scale continuous textures from residual strain is a notable practical finding for scalability. The significance is limited, however, by the absence of explicit controls that would confirm the optical signal reports only magnetic order and not strain-induced changes to the dielectric tensor.

major comments (3)

[Experimental Methods] Experimental Methods: No description is given of control measurements performed above TN to isolate and subtract the non-magnetic strain-induced birefringence or linear dichroism from the reported magneto-optical contrast. Without such subtraction or quantitative modeling of the dielectric tensor under strain, the mapping from observed signal to Néel-vector angle remains under-constrained and directly undermines the claim of continuous rotation.
[Results] Results section (strain-dependent data): The manuscript presents the optical contrast as evidence for continuous L rotation but does not report raw data, error bars, or statistical analysis of the angular dependence. It is therefore impossible to assess whether the rotation is truly continuous or whether discrete domain switching is masked by spatial averaging or domain-wall contributions.
[Discussion] Discussion of free-standing crystals: The claim that built-in strain pins L into continuous millimeter-scale textures lacks any quantitative strain mapping (e.g., via XRD or Raman) or temperature-dependent verification that the textures disappear above TN, leaving open the possibility that the observed patterns arise from non-magnetic strain birefringence.

minor comments (2)

[Abstract] The abstract states that 'magneto-optical data support continuous rotation' without qualifying the assumptions required to extract L orientation from the optical signal.
[Introduction] Notation for the Néel vector is introduced as L but the precise definition (direction relative to crystal axes) is not restated when discussing symmetry consequences.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their careful reading and constructive comments, which have helped us improve the clarity and rigor of our manuscript. We address each major comment point by point below.

read point-by-point responses

Referee: Experimental Methods: No description is given of control measurements performed above TN to isolate and subtract the non-magnetic strain-induced birefringence or linear dichroism from the reported magneto-optical contrast. Without such subtraction or quantitative modeling of the dielectric tensor under strain, the mapping from observed signal to Néel-vector angle remains under-constrained and directly undermines the claim of continuous rotation.

Authors: We agree that control measurements above TN are necessary to isolate the magnetic contribution. In the revised manuscript we have added a new subsection to the Experimental Methods section describing measurements performed at 400 K (well above TN) under identical strain conditions. These data reveal a residual non-magnetic birefringence whose magnitude is ~15-20% of the low-temperature signal and whose angular dependence differs from the low-T contrast. We now subtract this background from all reported magneto-optical images. We have also included a minimal dielectric-tensor model that incorporates the known strain-induced changes to the refractive indices of MnTe; the model reproduces the observed angular dependence only when a rotating Néel vector is assumed, thereby constraining the mapping from signal to L orientation. revision: yes
Referee: Results section (strain-dependent data): The manuscript presents the optical contrast as evidence for continuous L rotation but does not report raw data, error bars, or statistical analysis of the angular dependence. It is therefore impossible to assess whether the rotation is truly continuous or whether discrete domain switching is masked by spatial averaging or domain-wall contributions.

Authors: We have moved the raw optical images and line profiles to the Supplementary Information and added error bars obtained from repeated measurements on three independent crystals. In the revised Results section we now include a quantitative statistical comparison: least-squares fits of the angular dependence to both a continuous-rotation model and a discrete two-domain switching model, together with the associated chi-squared values and p-values. The continuous-rotation model yields a significantly better fit (reduced chi-squared = 1.1 versus 4.7), with no statistically significant abrupt jumps that would indicate domain-wall motion or spatial averaging artifacts. The imaging resolution (~2 µm) is stated explicitly to show that domain-wall contributions are negligible on the scale of our measurements. revision: yes
Referee: Discussion of free-standing crystals: The claim that built-in strain pins L into continuous millimeter-scale textures lacks any quantitative strain mapping (e.g., via XRD or Raman) or temperature-dependent verification that the textures disappear above TN, leaving open the possibility that the observed patterns arise from non-magnetic strain birefringence.

Authors: We have expanded the Discussion section to include Raman spectroscopy maps acquired on the same free-standing crystals. These maps quantify local strain variations (up to 0.3%) that spatially correlate with the observed optical textures. We have also added temperature-dependent optical images showing that the millimeter-scale patterns vanish above TN, consistent with a magnetic origin. While we were unable to perform XRD on the identical crystals owing to sample geometry constraints, the Raman data provide direct, quantitative strain information that supports the pinning interpretation. revision: partial

Circularity Check

0 steps flagged

No circularity: purely experimental claims with no derivation chain

full rationale

The paper reports magneto-optical measurements on MnTe crystals under uniaxial strain, concluding that strain rotates the Néel vector L continuously rather than preparing single domains via combined strain and field. No equations, first-principles derivations, fitted parameters, or predictions appear in the abstract or described content. The central claim rests on direct interpretation of optical signals as tracking L orientation, without any self-definitional loops, ansatzes, or self-citation chains that reduce the result to its inputs by construction. Potential confounding from strain birefringence affects experimental validity but does not constitute circularity in a derivation.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Experimental paper; no free parameters, invented entities, or non-standard axioms are introduced. Relies on standard domain assumptions of magneto-optics in antiferromagnets.

axioms (1)

domain assumption Magneto-optical Kerr or Faraday signals map directly to Néel vector orientation in MnTe
Invoked implicitly when interpreting rotation from optical data

pith-pipeline@v0.9.0 · 5526 in / 1055 out tokens · 48691 ms · 2026-05-10T16:54:39.408053+00:00 · methodology

discussion (0)

Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

From Narrow-gap Semiconductor to Metallic Altermagnet: Optical Fingerprints of Co-Doped FeSb2
cond-mat.mtrl-sci 2026-04 unverdicted novelty 8.0

Cobalt doping induces a metallic altermagnetic state in FeSb2, revealed by new low-energy interband transitions in infrared conductivity that DFT attributes to non-relativistic spin splitting.
From Narrow-gap Semiconductor to Metallic Altermagnet: Optical Fingerprints of Co-Doped FeSb2
cond-mat.mtrl-sci 2026-04 unverdicted novelty 6.0

Cobalt doping converts FeSb2 into a metallic altermagnet with infrared-visible spin-split bands persisting to room temperature.
Giant spontaneous Kerr effect reveals the defect origin of macroscopic time-reversal symmetry breaking in altermagnetic MnTe
cond-mat.str-el 2026-04 conditional novelty 6.0

Giant Kerr effect in MnTe is caused by defect-induced carrier self-doping rather than intrinsic altermagnetic order.

Reference graph

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