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arxiv: 2606.13540 · v1 · pith:B5JT4DLAnew · submitted 2026-06-11 · ❄️ cond-mat.mes-hall · physics.app-ph

Micron-sized magnonic 3-port rectilinear circulator

Kevin S. Weber , Loic Temdie , Vincent Castel , Timmy Reimann , Morris Lindner , Carsten Dubs , Yves Henry , Matthieu Bailleul
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Vincent Vlaminck
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Pith reviewed 2026-06-27 05:42 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall physics.app-ph
keywords magnon circulatorspin-wave circulationnanowire gratingsnon-reciprocal microwavechiral spin wavesrectilinear beamsmagnonics3-port spectroscopy
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The pith

A micron-sized magnon circulator routes unidirectional spin waves in a loop between three ports.

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

The paper shows that nanowire gratings can launch chiral spin waves that travel as straight, one-way beams between three ports to create a functional circulator. Full three-port spectroscopy measurements confirm that the waves circulate as intended rather than transmitting reciprocally. The operating frequency sits in a narrow band that can be shifted from 2 to 8 GHz by changing an external magnetic field up to 100 mT or by altering the grating size that fixes the wavevector. This approach avoids the usual need for curved waveguides or bulky magnets in non-reciprocal devices. The result is a compact prototype that could fit into integrated microwave circuits.

Core claim

Taking advantage of the chiral excitation of spin-waves via nanowire gratings, we propose an original design of a circulator involving three channels of rectilinear and unidirectional spin-wave beams. We demonstrate via a full 3-port spin-wave spectroscopy a genuine spin-wave circulation between the three ports. The narrow frequency band of operation can be tuned over a broad range of frequencies (2-8 GHz) with both an external field of up to 100 mT, and the dimensions of the grating specifying the wavevectors.

What carries the argument

Nanowire gratings that produce chiral excitation of spin waves, forming three channels of rectilinear unidirectional beams.

If this is right

  • Genuine spin-wave circulation occurs between the three ports in the measured device.
  • The narrow operating band can be shifted across 2-8 GHz by external field or grating dimensions.
  • The design is compatible with micron-scale integrated circuit architectures.
  • It provides the first experimental characterization of a prototypical magnon circulator of this size.

Where Pith is reading between the lines

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

  • The rectilinear beam geometry could be combined with other straight-channel magnonic components to build larger all-magnon circuits.
  • Tuning via grating dimensions offers a way to match the circulator frequency to specific on-chip microwave sources without changing the external field.
  • If backscattering remains low at higher wavevectors, the same principle may extend operation above 8 GHz in thinner films or different materials.

Load-bearing premise

The nanowire gratings produce truly unidirectional rectilinear spin-wave beams with negligible backscattering or parasitic coupling that would mask the circulation.

What would settle it

Three-port spectroscopy showing symmetric transmission or measurable power returning to the input port instead of circulating to the next port.

Figures

Figures reproduced from arXiv: 2606.13540 by Carsten Dubs, Kevin S. Weber, Loic Temdie, Matthieu Bailleul, Morris Lindner, Timmy Reimann, Vincent Castel, Vincent Vlaminck, Yves Henry.

Figure 1
Figure 1. Figure 1: FIG. 1. (a) 3-port spin-wave spectroscopy setup. (inset) [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. (a) Frequency-field mappings of the relative scattering parameters ∆ [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. (a) Bias field dependence of the spin-waves transport properties derived from the inductances ∆ [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: (c) a typical spectra at µ0Hext = 20 mT for this device zoomed around the peaks corresponding to the wavevector k1 and k2. Despite the inherent increase in insertion losses at higher wavevectors, reaching 67 dB for k1 and 85 dB for k2, both remain non-reciprocal, with a chiral isolation of 23 dB for k1 and at least 14 dB for k2 above the noise floor. The residual signal observed in the isolation direction … view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. (a) Raw data with insertion and rejection loss. (b) Power dependence at [PITH_FULL_IMAGE:figures/full_fig_p006_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. (a) Full ( [PITH_FULL_IMAGE:figures/full_fig_p007_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Example spectra ∆ [PITH_FULL_IMAGE:figures/full_fig_p007_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. Inductance amplitude ratios for attenuation length estimation for the first device at. The ratio of the mutual [PITH_FULL_IMAGE:figures/full_fig_p008_8.png] view at source ↗
read the original abstract

The development of miniaturized non-reciprocal microwave technologies compatible with integrated circuit architectures remains a critical challenge for modern information technology. Here, we present the first experimental characterization of a micron-sized prototypical magnon circulator. Taking advantage of the chiral excitation of spin-waves via nanowire gratings, we propose an original design of a circulator involving three channels of rectilinear and unidirectional spin-wave beams. We demonstrate via a full 3-port spin-wave spectroscopy a genuine spin-wave circulation between the three ports. The narrow frequency band of operation can be tuned over a broad range of frequencies ($2$-$8$ GHz) with both an external field of up to $100$ mT, and the dimensions of the grating specifying the wavevectors. This proposed scheme opens up possibilities for new architectures of integrated and miniaturized non-reciprocal microwave devices.

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 claims the first experimental demonstration of a micron-sized 3-port magnonic circulator. It uses nanowire gratings to achieve chiral excitation of rectilinear, unidirectional spin-wave beams in three channels and reports genuine circulation via full 3-port spin-wave spectroscopy. The narrow operating band is stated to be tunable from 2-8 GHz by external field (up to 100 mT) and grating dimensions.

Significance. If the experimental demonstration of circulation is robust, the work would represent a meaningful step toward compact, integrated non-reciprocal magnonic components compatible with microwave circuits. The grating-based chiral excitation approach and field/grating tunability are potentially useful features for device engineering.

major comments (2)
  1. [Abstract / Results] Abstract and main text assert a 'demonstration via a full 3-port spin-wave spectroscopy' of genuine circulation, yet no transmission spectra (S-parameters), isolation ratios, error bars, or control measurements are supplied. Without these data the central experimental claim cannot be evaluated.
  2. [Device Design / Experimental Methods] The design rests on the assumption that the nanowire gratings produce truly unidirectional rectilinear beams with negligible backscattering or parasitic coupling. No direct characterization of beam directivity, isolation, or exclusion of reverse-propagating modes is described, which is load-bearing for interpreting the 3-port circulation data as genuine non-reciprocity rather than an artifact.
minor comments (2)
  1. [Introduction / Results] The frequency range is given as 2-8 GHz but no explicit relation between grating wavevector, dispersion relation, and observed band edges is provided.
  2. [Abstract] Notation for the three ports and circulation direction (clockwise vs. counterclockwise) should be defined consistently in text and any figures.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their detailed and constructive review. We address each major comment below and will revise the manuscript accordingly to strengthen the presentation of the experimental evidence.

read point-by-point responses

  1. Referee: [Abstract / Results] Abstract and main text assert a 'demonstration via a full 3-port spin-wave spectroscopy' of genuine circulation, yet no transmission spectra (S-parameters), isolation ratios, error bars, or control measurements are supplied. Without these data the central experimental claim cannot be evaluated.

    Authors: We agree that the central claim requires explicit supporting data for full evaluation. The revised manuscript will include the complete 3-port transmission spectra presented as S-parameters, quantitative isolation ratios between ports, error bars derived from repeated measurements, and control experiments (e.g., measurements with reversed field polarity or modified grating orientations) to confirm genuine circulation rather than reciprocal behavior. revision: yes

  2. Referee: [Device Design / Experimental Methods] The design rests on the assumption that the nanowire gratings produce truly unidirectional rectilinear beams with negligible backscattering or parasitic coupling. No direct characterization of beam directivity, isolation, or exclusion of reverse-propagating modes is described, which is load-bearing for interpreting the 3-port circulation data as genuine non-reciprocity rather than an artifact.

    Authors: We acknowledge that direct experimental characterization of the beam properties is necessary to substantiate the unidirectional assumption. In the revision we will add dedicated measurements and/or micromagnetic simulations quantifying the directivity of the rectilinear beams, the isolation between forward and reverse propagation directions, and evidence that reverse-propagating modes are suppressed below detectable levels under the operating conditions used for the 3-port data. revision: yes

Circularity Check

0 steps flagged

No significant circularity: purely experimental demonstration

full rationale

The manuscript reports an experimental realization and 3-port spin-wave spectroscopy characterization of a magnonic circulator. No derivation chain, theoretical model, or set of equations is presented whose outputs are claimed to follow from first principles or predictions; the central claims rest on measured transmission spectra, device fabrication parameters, and external field tuning. The unidirectional-beam design is stated as an input assumption consistent with the observed data rather than a quantity derived or fitted within the paper itself. No self-citation load-bearing steps, fitted-input predictions, or ansatz smuggling appear in the reported work.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Central claim rests on the experimental premise that nanowire gratings enable chiral unidirectional excitation of rectilinear spin-wave beams; no explicit free parameters, axioms, or invented entities are stated in the abstract.

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