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REVIEW 4 major objections 4 minor 49 references

Identification of orbital pumping from spin pumping and rectification effects

T0 review · 4 major / 4 minor · reviewed 2026-08-08 · deepseek-v4-flash

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Pith's one-line read A sign flip fingerprints orbital pumping in Nb/Ni bilayers.

desk verdict A plausible but sign-dependent orbital pumping identification in Nb/Ni, worth refereeing despite relying on a self-cited OHA sign. read the letter →

arxiv 2502.08269 v1 pith:PAMR6YRU submitted 2025-02-12 cond-mat.mtrl-sci physics.app-ph

Nils Keller , Arnab Bose , Nozomi Soya , Elias Hauth , Fabian Kammerbauer , Rahul Gupta , Hiroki Hayashi , Hisanobu Kashiki
show 4 more authors
Gerhard Jakob Sachin Krishnia Kazuya Ando Mathias Kläui
This is my paper · ORCID
classification cond-mat.mtrl-sciphysics.app-ph
keywords orbitalpumpinginverseHalleffectspinrectificationeffectsniobiumferromagneticresonanceorbitronics
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper sets out to show that the recently predicted effect of orbital pumping—a precessing magnet emitting a pure orbital current into an adjacent metal—can be identified in experiment despite large backgrounds from spin pumping and spin rectification. Its evidence is a sign reversal of the symmetric Lorentzian voltage in Nb/Ni compared with Nb/FeCoB, which conventional spin pumping cannot explain. Because Nb's spin Hall angle and orbital Hall angle have opposite signs, the reversal indicates that the orbital current converted by the inverse orbital Hall effect dominates in Nb/Ni. The paper also establishes angular- and spatial-dependence procedures that separate the pumping signal from rectification artifacts.

What carries the argument

The load-bearing objects are (i) the bilayer device placed in the slot of a coplanar waveguide, which produces a uniform radio-frequency field and lets the induced current path be distinguished from the pumping path; (ii) the angular decomposition $V_S(\phi) \approx V_S^{\mathrm{pump}}\sin\phi + V_{S,\mathrm{AMR}}^{\mathrm{ST-FMR}}\cos\phi\sin 2\phi + V_{S,\mathrm{AMR}}^{\mathrm{NL}}\sin 2\phi$, which assigns the $\sin\phi$ term to the pumping signal and the other terms to spin-torque and nonlocal rectification; and (iii) the sign competition between the spin Hall angle (negative) and orbital Hall angle (positive) of Nb relative to Pt, which makes orbital pumping reverse the sign of the symmetric voltage. The inverse orbital Hall effect in the Nb layer is the conversion mechanism that turns the pumped orbital current into a measurable voltage.

What would settle it

Measure the sign of the orbital Hall angle of these exact Nb(4) films by an independent technique, for example harmonic Hall or orbital-torque magnetometry on Nb/CoFeB with a heavy-metal capping layer. If the orbital Hall angle of this Nb is found to have the opposite sign to Pt, the observed sign reversal in Nb/Ni would have to be re-assigned to spin pumping or another mechanism rather than to orbital pumping.

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Extended reading notes

Core claim

The central claim is that the sign reversal of the symmetric Lorentzian voltage observed in Nb(4)/Ni(6) compared with Nb(4)/FeCoB(8) cannot be explained by the conventional spin pumping effect, and therefore identifies orbital pumping via the inverse orbital Hall effect in Nb. The same sign of $V_S$ in Nb/Ni and Pt/(Ni or FeCoB), combined with the opposite sign in Nb/FeCoB, is read as evidence that the injected orbital current dominates the measured voltage in Nb/Ni, while spin pumping sets the sign in Nb/FeCoB and Pt. The angular dependence of $V_S$ is fitted to $V_S(\phi) \approx V_S^{\mathrm{pump}}\sin\phi + V_{S,\mathrm{AMR}}^{\mathrm{ST-FMR}}\cos\phi\sin 2\phi + V_{S,\mathrm{AMR}}^{\mathrm{NL}}\sin 2\phi$, and the $\sin\phi$ coefficient is shown to be positive in Nb/Ni, indicating orbital-pumping dominance; the gap-width dependence of this coefficient scales as $1/d^{m}$ with $m\approx 1$, as expected for a pumping signal, separating it from the $m\approx 2$ scaling of the rectification term.

Load-bearing premise

The interpretation rests on the assumption that the specific Nb films have a spin Hall angle opposite in sign to Pt and an orbital Hall angle of the same sign as Pt, taken from prior work on orbital Hall torques.

Editorial extensions

If this is right

  • Orbital pumping generates a pure orbital current from a precessing ferromagnet without any electrical current injection, offering a route to orbital-current sources free of conductivity-mismatch losses.
  • Ni emits a detectable orbital current into Nb, and the sign of the symmetric voltage can be used as a fingerprint of the dominant pumped angular-momentum channel.
  • The angular-dependence decomposition isolates the pumping contribution from spin-torque and nonlocal rectification terms in the same measurement.
  • The gap-width scaling ($m\approx 1$ for pumping vs $m\approx 2$ for ST-FMR rectification) provides a spatial test that separates pumping from rectification artifacts.
  • The approach should transfer to other NM/FM pairs whose spin and orbital Hall angles have opposite signs, enabling material screening for orbital pumping.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • A direct test would be to measure the orbital Hall angle of the specific sputtered Nb films used here by an independent orbital-torque experiment; if the sign differs from the assumption taken from earlier work, the sign-reversal interpretation would need revision.
  • The $\sin\phi$ sign criterion could be used as a fast screening tool to rank candidate nonmagnetic metals by their orbital-pumping efficiency without needing separate spin- and orbital-Hall calibrations.
  • If orbital currents indeed survive in light metals with weak spin-orbit coupling, the same geometry could be used to probe orbital pumping in stacks where conductivity mismatch would otherwise hide spin pumping.
  • The gap-width scaling suggests that measuring the same device at several waveguide distances is a general separator; one could extend it to extract the orbital diffusion length from the $d$-dependence at short separations.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 4 minor

Summary. The paper reports spin-pumping and orbital-pumping measurements in Nb/Ni and Nb/FeCoB bilayers compared with Pt/Ni and Pt/FeCoB controls. The central observation is a sign reversal of the symmetric Lorentzian voltage VS in Nb/Ni relative to Nb/FeCoB, which the authors attribute to orbital pumping dominating over spin pumping because Nb is assumed to have a spin Hall angle opposite to Pt but the same orbital Hall angle. The authors also present angular-dependent measurements fitted by Eq. (1) and a gap-width dependence of the extracted coefficients, which they propose as methods to separate pumping signals from spin rectification effects (SREs).

Significance. If the interpretation is correct, the work provides a practical scheme for identifying orbital pumping in metallic bilayers using sign reversal and angular/spatial fingerprints, building on the recently predicted orbital pumping mechanism. The device geometry with the sample placed in the waveguide slot is a useful methodological contribution, and the explicit treatment of ST-FMR as a source of symmetric voltage is a valuable caveat for the field. However, the central conclusion rests on an external, self-cited sign assignment for the orbital Hall angle of Nb that is not verified on the specific films used here, and the key fits lack error analysis. The result is therefore plausible but not yet load-bearing without further experimental support.

major comments (4)
  1. [RESULTS AND DISCUSSION, paragraph after Figure 2] The identification of orbital pumping in Nb/Ni hinges on the assumption that Nb has the same sign of the orbital Hall angle (OHA) as Pt and an opposite spin Hall angle, as stated in the text: 'We chose Nb and Pt as they exhibit opposite signs for the spin Hall angle (SHA), yet have the same sign for the orbital Hall angle (OHA) [24].' This OHA sign is imported from Ref. [24], a prior study by the same group, and is not verified for the specific Ta(1)/Nb(4) films used in this work. If the OHA sign in these films were opposite to Pt, the positive VS in Nb/Ni would be indistinguishable from conventional spin pumping with a positive SHA in Nb, and the orbital-pumping claim would collapse. The authors should either directly characterize the OHA sign on identical films (e.g., via harmonic Hall or orbital torque measurements) or explicitly restrict the conclusion to the assumed sign convention and specify a measurement that could falsify the orbital-pumping interpretation.
  2. [Eq. (1) and Figures 2(e-h), 3] The angular dependence in Eq. (1) is fitted to the data in Figures 2(e-h) and 3, but no error bars, confidence intervals, or goodness-of-fit metrics are reported for the fitted coefficients. The central observable is the sign of V_S^pump, the coefficient of the sin φ term; without uncertainty estimates the reader cannot judge whether the sign reversal between Nb/Ni and Nb/FeCoB is statistically significant, nor whether the magnitudes of the SRE terms are reliably separated from the pumping term. Please report standard errors or confidence intervals for all fitted coefficients, and show representative residuals.
  3. [Figure 3 and 'RESULTS AND DISCUSSION' text on gap-width dependence] The claim that the pumping signal V_S^pump scales as 1/d^m with m ≈ 1.0, whereas the ST-FMR term scales as m ≈ 2.0, is used to argue that the sin φ term is a true pumping signal rather than a rectification artifact. However, no uncertainty on m is reported, and the number of devices and error bars per gap width are not stated. Without this information, the spatial-dependence separation is not quantitatively established. Please provide the individual data points with uncertainties, the fit with confidence bands, and specify how many independent measurements were taken.
  4. [RESULTS AND DISCUSSION, paragraph after Figure 2] The paper states that the sign reversal 'cannot be explained by the conventional spin pumping effect', but no quantitative estimate of the expected spin pumping voltage in Nb/Ni is provided. To support this statement, the authors should estimate the spin pumping contribution from the known (negative) SHA of Nb and show that it cannot account for the observed positive VS. Without such a comparison, the argument rests entirely on the assumed sign of the OHA, and other sources of positive VS (e.g., thermal or Nernst contributions) are not excluded.
minor comments (4)
  1. [Introduction, first paragraph] The phrase 'chiral magenetic skyrmions' contains a typo; it should be 'chiral magnetic skyrmions'.
  2. [RESULTS AND DISCUSSION, paragraph on SREs] The text reads 'variouscurrent-inducedmagneticfields' without spacing; please correct the formatting to 'various current-induced magnetic fields'.
  3. [Figure 3 and text] Figure 3 uses the symbol d for gap width, but the experimental section uses 'gap width' without defining d; please define d explicitly in the caption or text.
  4. [Eq. (1)] The notation V_S^pump is used as a coefficient in Eq. (1) but is not explicitly defined as the amplitude of the sin φ term; please add a sentence defining this notation.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the sign-reversal measurement is a new result, and the imported OHA sign rests on independent prior experiment and theory, not on the present fit.

full rationale

The paper's central claim is an experimental observation (sign of the symmetric Lorentzian voltage and its sin φ component) interpreted through material-specific signs of the spin and orbital Hall effects. The spin Hall sign in Nb is inferred in this work from the Nb/FeCoB vs Pt/FeCoB comparison, not assumed. The orbital Hall sign of Nb is imported from Ref. [24], a prior experimental study by overlapping authors, and is also said to be consistent with first-principles theory Ref. [19]; it is not fitted to or defined by the present voltage data. Equation (1) is a fitting decomposition of the angular dependence, not a definition of the conclusion, and the sign reversal is an independently measured input to the interpretation. The only substantive risk is whether the specific Ta(1)/Nb(4) films have the OHA sign assumed from Ref. [24]; that is a correctness/validity concern about sample transferability, not circularity, because the cited prior result is externally falsifiable and does not include the present target result. Accordingly no circular step is identified.

Assumptions & free parameters 1 free parameters · 4 assumptions · 0 invented entities

The paper introduces no new free entities. Its central interpretation relies on literature values for spin and orbital Hall angle signs, on the theoretical prediction of orbital pumping, and on a specific angular model for rectification voltages. The only fitted parameter that plays a role in the separation argument is the gap-width exponent m.

free parameters (1)
  • gap-width scaling exponent m = m ≈ 1.0 for V_pump; m ≈ 2.0 for V_ST-FMR
    Fitted to the measured voltage coefficients as a function of the gap width d (Figure 3). The separation of pumping from SREs relies on this difference in scaling.
assumptions (4)
  • domain assumption Nb and Pt have spin Hall angles of opposite sign and orbital Hall angles of the same sign.
    Invoked in Experiment and Results sections; the sign reversal in Nb/Ni is interpreted as orbital pumping only under this sign assignment, which is taken from Ref. [24] by the same group.
  • domain assumption The symmetric voltage component follows V_S(phi) = V_pump sin phi + V_ST-FMR cos phi sin 2phi + V_NL sin 2phi.
    Equation (1) is used to extract the pumping coefficient from angular sweeps. If unmodeled rectification terms also have a sin phi dependence, the extracted V_pump is contaminated.
  • domain assumption Orbital pumping exists and is governed by Onsager reciprocity such that Ni emits a strong orbital current while FeCoB does not.
    The expected contrast between Ni and FeCoB motivates the sample choice and the interpretation of the Nb/Ni sign as orbital-dominated. This rests on theory Refs. [33-35] and prior observation Ref. [45].
  • standard math Field-swept voltage spectra can be decomposed into symmetric and antisymmetric Lorentzians, with the symmetric part carrying the pumping signal.
    Standard ferromagnetic resonance analysis, but its validity for separating orbital pumping from rectification is the paper's central methodological claim.

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Cite this review

Pith. "Pith review of Identification of orbital pumping from spin pumping and rectification effects." pith.science (2026). https://pith.science/paper/PAMR6YRU

@misc{pith2026250208269,
  author       = {Pith},
  title        = {Pith review of: Identification of orbital pumping from spin pumping and rectification effects},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/PAMR6YRU}},
  note         = {Machine review of arXiv:2502.08269}
}
abstract

The recently predicted mechanism of orbital pumping enables the generation of pure orbital current from a precessing ferromagnet (FM) without the need for electrical current injection. This orbital current can be efficiently injected into an adjacent nonmagnetic material (NM) without being hampered by electrical conductivity mismatch. However, experimentally identifying this novel effect presents significant challenges due to the substantial background contributions from spin pumping and spin rectification effects (SREs). In this work, we disentangle the effects of orbital pumping from spin pumping in bilayer structures composed of Nb/Ni and Nb/$\mathrm{Fe_{60}Co_{20}B_{20}}$ by observing a sign reversal of the measured voltage. This reversal arises from the competing signs of the spin and orbital Hall effects in the Nb. We establish methods to differentiate the pumping signal from SREs by analyzing the distinct angular dependence of the measured voltage and its spatial dependence relative to the radio frequency excitation source.

Figures

Figures reproduced from arXiv: 2502.08269 by the authors.

Figure 1
Figure 1. Schematic representation of (a) orbital pumping and (b) spin pumping from a precessing magnet into an adjacent [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Magnetic field sweep measurements for (a) Nb(4)/Ni(6), (b) Nb(4)/FeCoB(8), (c) Pt(4)/Ni(6) and (d) [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. The strengths of the different effects in [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗

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Pith tools

Reviewed August 8, 2026 · model on record in the stance chip above.