Giant orbital-magnon conversion driven perpendicular magnetization switching

Baiyan Kang; Donglin Song; Fanyu Meng; Jia Zhang; Jijun Zhao; Mingyang Sun; Tuo Zhang; Wenping Zhou; Ying Feng; Yi Wang

arxiv: 2605.04486 · v1 · submitted 2026-05-06 · ❄️ cond-mat.mes-hall

Giant orbital-magnon conversion driven perpendicular magnetization switching

Fanyu Meng , Ying Feng , Mingyang Sun , Baiyan Kang , Donglin Song , Tuo Zhang , Jia Zhang , Wenping Zhou

show 2 more authors

Jijun Zhao Yi Wang

This is my paper

Pith reviewed 2026-05-08 17:43 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall

keywords orbital-magnon conversionperpendicular magnetization switchingroom temperatureorbitronicsmagnonicsantiferromagnetic insulatorCoFeBbilayer heterostructure

0 comments

The pith

Direct orbital-to-magnon conversion enables efficient room-temperature perpendicular magnetization switching in a CoFeB layer.

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

The paper demonstrates that orbital angular momentum converts directly to magnons in an orbital metal paired with an antiferromagnetic insulator. This conversion happens at room temperature and reaches an efficiency more than ten times higher than in orbital systems that lack the magnon step. The generated magnons then produce torque that switches the magnetization of an adjacent CoFeB ferromagnetic layer from in-plane to out-of-plane. A reader would care because the result connects orbitronics with magnonics and points toward information carriers that could operate with lower power than charge-based electronics.

Core claim

In an orbital metal/antiferromagnetic insulator bilayer, orbital angular momentum converts to magnons at room temperature with efficiency over an order of magnitude higher than in traditional orbital systems. The conversion mediates efficient perpendicular magnetization switching in a CoFeB ferromagnetic layer, establishing a direct link between orbitronics and magnonics.

What carries the argument

Orbital-to-magnon (L-M) conversion in the orbital metal/antiferromagnetic insulator bilayer, which generates magnons that deliver torque to switch the magnetization direction in the adjacent CoFeB layer.

If this is right

Room-temperature perpendicular switching becomes possible without cryogenic cooling or high current densities.
Device energy use drops because the L-M channel is more than ten times more efficient than prior orbital-only routes.
A hybrid orbitronics-magnonics platform emerges for information processing that uses both orbital and magnon degrees of freedom.
Perpendicular geometry allows higher-density memory cells than in-plane configurations.

Where Pith is reading between the lines

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

If the bilayer can be integrated with existing magnonic waveguides, orbital injection could serve as a new way to launch and steer magnons at room temperature.
The same structure might allow voltage-controlled orbital currents to modulate magnon flow, creating hybrid logic elements.
Scaling the mechanism to other antiferromagnetic insulators could tune the operating frequency range for different magnonic applications.

Load-bearing premise

The observed perpendicular switching is produced specifically by orbital-to-magnon conversion rather than by conventional spin-orbit torque or other interfacial effects at the bilayer interfaces.

What would settle it

A control sample in which the antiferromagnetic insulator is replaced by a non-magnetic insulator of similar thickness and interface quality, yet still shows comparable switching efficiency, would falsify the claim that L-M conversion is the mediating mechanism.

read the original abstract

The pursuit of beyond-Moore information technologies has stimulated the exploration of novel information carriers, such as electron spin, orbital, and magnon, beyond electron charge. Efficient interconversion among these degrees of freedom and precise control over the information states are crucial for advancing nanoelectronic devices. However, a direct coupling between orbital angular momentum (L) and magnons (M) has remained elusive, and magnetization switching through orbital-to-magnon (L-M) conversion has not yet been achieved. Here, we report the experimental demonstration of L-M conversion in an orbital metal/antiferromagnetic insulator bilayer at room temperature, with an efficiency over an order of magnitude higher than that in traditional orbital systems lacking the L-M process. Consequently, we achieved efficient room-temperature perpendicular magnetization switching in a CoFeB ferromagnetic layer mediated by this new mechanism. Our findings establish a direct link between orbitronics and magnonics, providing a new platform for the development of advanced nano-devices based on orbital-driven magnonic phenomena.

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 claims the first direct orbital-magnon conversion for high-efficiency room-temperature perpendicular switching in a bilayer, but the attribution to this new mechanism over standard interfacial torques rests on thin evidence.

read the letter

The core claim is an experimental demonstration of orbital-to-magnon conversion in an orbital metal/antiferromagnetic insulator bilayer that supposedly drives efficient perpendicular magnetization switching in an adjacent CoFeB layer at room temperature, with efficiency more than ten times higher than prior orbital systems. If the data back this up, it would give a concrete experimental bridge between orbitronics and magnonics that has been missing so far. That is the main thing worth knowing about the work. The abstract frames the result as the first time direct L-M coupling has been shown and used for switching, which positions it as new relative to earlier orbital torque or magnon studies. The paper does a clear job stating the device geometry and the reported outcome without overclaiming beyond the abstract. The soft spot is the mechanistic attribution. The switching is presented as mediated specifically by the L-M process, yet the provided text gives no quantitative controls such as orbital-layer thickness dependence, temperature scaling of the torque, or comparison samples without the antiferromagnetic insulator that would rule out conventional spin-orbit torques at the interfaces. Without those, the order-of-magnitude efficiency gain cannot be confidently tied to the new conversion channel rather than more established effects. The full manuscript is said to be available, but the abstract alone leaves this gap. This work is for people in spintronics and magnonics who follow new torque mechanisms and room-temperature device concepts. A reader looking for fresh experimental platforms would find the bilayer idea worth examining, though they would need to check the controls themselves. It deserves a serious referee to assess whether the data actually isolate the claimed mechanism. I would send it to peer review rather than desk reject, with the expectation that the authors will have to strengthen the evidence for L-M dominance.

Referee Report

2 major / 1 minor

Summary. The manuscript reports the experimental demonstration of giant orbital-to-magnon (L-M) conversion in an orbital metal/antiferromagnetic insulator (AFI) bilayer at room temperature. The L-M process is claimed to yield an efficiency more than an order of magnitude higher than in conventional orbital systems, enabling efficient perpendicular magnetization switching in an adjacent CoFeB ferromagnetic layer mediated specifically by this orbital-magnon mechanism.

Significance. If the mechanistic attribution holds, the work would establish a direct experimental link between orbitronics and magnonics, offering a potentially more efficient route to room-temperature magnetization control than existing spin-orbit torque approaches and opening a new platform for orbital-driven magnonic devices.

major comments (2)

[Abstract and Results] The central claim that the observed switching is 'mediated by this new mechanism' (L-M conversion) rather than interfacial spin-orbit torques requires explicit isolation. The abstract and results sections provide no quantitative signatures such as orbital-layer thickness dependence, temperature scaling of the torque, or control samples with non-AFI insulators that would be needed to exclude conventional SOT contributions.
[Methods/Experimental Details] No experimental methods, bilayer characterization details, error bars, or control measurements are described, making it impossible to assess whether the reported efficiency gain is reproducible or attributable to L-M conversion as stated.

minor comments (1)

[Abstract] The abstract states an efficiency 'over an order of magnitude higher' without specifying the reference value or the exact metric (e.g., torque efficiency per current density); this should be quantified with a direct comparison in the main text.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading and constructive comments on our manuscript. We address the major comments point by point below and indicate the revisions that will be made.

read point-by-point responses

Referee: [Abstract and Results] The central claim that the observed switching is 'mediated by this new mechanism' (L-M conversion) rather than interfacial spin-orbit torques requires explicit isolation. The abstract and results sections provide no quantitative signatures such as orbital-layer thickness dependence, temperature scaling of the torque, or control samples with non-AFI insulators that would be needed to exclude conventional SOT contributions.

Authors: We agree that stronger isolation of the L-M mechanism from possible conventional SOT contributions is necessary to support the central claim. In the revised manuscript we will expand the abstract and results sections to explicitly present the orbital-layer thickness dependence (showing non-monotonic behavior consistent with orbital diffusion), the temperature scaling of the effective torque, and switching data from control samples using non-AFI insulators that exhibit substantially lower efficiency. These additions will be used to argue that the observed perpendicular switching is mediated by the L-M process rather than interfacial SOT. revision: yes
Referee: [Methods/Experimental Details] No experimental methods, bilayer characterization details, error bars, or control measurements are described, making it impossible to assess whether the reported efficiency gain is reproducible or attributable to L-M conversion as stated.

Authors: We apologize for the insufficient detail in the submitted version. The revised manuscript will contain an expanded Methods section that describes the bilayer fabrication process, structural and magnetic characterization methods, the full measurement protocols, and the statistical basis for the reported error bars. Control measurements, including those with non-AFI insulators, will be moved into the main text with accompanying discussion to allow direct assessment of reproducibility and the attribution to L-M conversion. revision: yes

Circularity Check

0 steps flagged

No derivation chain; experimental report with no circular reductions

full rationale

The paper is an experimental demonstration of orbital-to-magnon conversion and room-temperature perpendicular switching in a bilayer structure. No equations, theoretical derivations, fitted parameters, or self-citation chains are presented that reduce any claimed efficiency, switching mechanism, or prediction to inputs defined by the same data. The central claims rest on observed phenomena and efficiency comparisons rather than any self-referential mathematical construction, making the work self-contained against external benchmarks with no detectable circularity.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The claim rests on standard condensed-matter assumptions about interfacial coupling and magnon generation; no free parameters, ad-hoc axioms, or new invented entities are introduced in the abstract.

axioms (1)

domain assumption Standard assumptions of spin-orbit coupling and magnon propagation at interfaces in magnetic heterostructures
Invoked implicitly to interpret the bilayer behavior as L-M conversion.

pith-pipeline@v0.9.0 · 5493 in / 1296 out tokens · 62893 ms · 2026-05-08T17:43:47.903771+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

Cost.FunctionalEquation (J-cost forcing) washburn_uniqueness_aczel unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

the L-M conversion coefficient in NiO can be quantitatively determined ... and the value is ~0.033 ... the final L-M conversion coefficient is ~ 0.06

What do these tags mean?

matches: The paper's claim is directly supported by a theorem in the formal canon.
supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses: The paper appears to rely on the theorem as machinery.
contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Reference graph

Works this paper leans on

48 extracted references · 48 canonical work pages

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[1] [1]

Nobel Lecture: Origin, development, and future of spintronics

Fert, A. Nobel Lecture: Origin, development, and future of spintronics. Rev. Mod. Phys. 80, 1517-1530 (2008)

work page 2008

[2] [2]

Brataas, A., Kent, A. D. & Ohno, H. Current -induced torques in magnetic materials. Nat. Mater. 11, 372-381 (2012)

work page 2012

[3] [3]

V ., Vasyuchka, V

Chumak, A. V ., Vasyuchka, V . I., Serga, A. A. & Hillebrands, B. Magnon spintronics. Nat. Phys. 11, 453-461 (2015)

work page 2015

[4] [4]

& Zhang, T

Han, X., Wu, H. & Zhang, T. Magnonics: Materials, physics, and devices. Appl. Phys. Lett. 125, 020501 (2024)

work page 2024

[5] [5]

Choi, Y . G. et al. Observation of the orbital Hall effect in a light metal Ti. Nature 619, 52- 56 (2023)

work page 2023

[6] [6]

Hayashi, H. et al. Observation of orbital pumping. Nat. Electron. 7, 646-652 (2024)

work page 2024

[7] [7]

& Wunderlich, J

Jungwirth, T., Marti, X., Wadley, P. & Wunderlich, J. Antiferromagnetic spintronics. Nat. Nanotechnol. 11, 231-241 (2016)

work page 2016

[8] [8]

Baltz, V . et al. Antiferromagnetic spintronics. Rev. Mod. Phys. 90, 015005 (2018)

work page 2018

[9] [9]

Slonczewski, J. C. Current -driven excitation of magnetic multilayers. J. Magn. Magn. Mater. 159, L1-L7 (1996)

work page 1996

[10] [10]

Emission of spin waves by a magnetic multilayer traversed by a current

Berger, L. Emission of spin waves by a magnetic multilayer traversed by a current. Phys. Rev. B 54, 9353-9358 (1996)

work page 1996

[11] [11]

Myers, E. B. et al. Current-Induced Switching of Domains in Magnetic Multilayer Devices. Science 285, 867-870 (1999)

work page 1999

[12] [12]

Liu, L. et al. Spin-Torque Switching with the Giant Spin Hall Effect of Tantalum. Science 336, 555-558 (2012)

work page 2012

[13] [13]

Miron, I. M. et al. Perpendicular switching of a single ferromagnetic layer induced by in - plane current injection. Nature 476, 189-193 (2011)

work page 2011

[14] [14]

Kajiwara, Y . et al. Transmission of electrical signals by spin -wave interconversion in a magnetic insulator. Nature 464, 262-266 (2010)

work page 2010

[15] [15]

Lebrun, R. et al. Tunable long-distance spin transport in a crystalline antiferromagnetic iron oxide. Nature 561, 222-225 (2018)

work page 2018

[16] [16]

Cornelissen, L. J. et al. Long-distance transport of magnon spin information in a magnetic insulator at room temperature. Nat. Phys. 11, 1022-1026 (2015)

work page 2015

[17] [17]

Wang, Y . et al. Magnetization switching by magnon -mediated spin torque through an antiferromagnetic insulator. Science 366, 1125-1128 (2019)

work page 2019

[18] [18]

& Yang, H

Wang, Y . & Yang, H. Spin-Orbit Torques Based on Topological Materials. Acc. Mater. Res. 3, 1061-1072 (2022)

work page 2022

[19] [19]

Wang, F. et al. Deterministic switching of perpendicular magnetization by out -of-plane anti-damping magnon torques. Nat. Nanotechnol. 19, 1478-1484 (2024)

work page 2024

[20] [20]

Zheng, D. et al. High-Efficiency Magnon-Mediated Magnetization Switching in All-Oxide 13 Heterostructures with Perpendicular Magnetic Anisotropy. Adv. Mater. 34, 2203038 (2022)

work page 2022

[21] [21]

Guo, C. Y . et al. Switching the perpendicular magnetization of a magnetic insulator by magnon transfer torque. Phys. Rev. B 104, 094412 (2021)

work page 2021

[22] [22]

Shi, G. et al. Room -Temperature Switching of Perpendicular Magnetization by Magnon Torques. Phys. Rev. Appl. 19, 034039 (2023)

work page 2023

[23] [23]

Lee, S. et al. Efficient conversion of orbital Hall current to spin current for spin-orbit torque switching. Commun. Phys. 4, 234 (2021)

work page 2021

[24] [24]

& Gambardella, P

Sala, G. & Gambardella, P. Giant orbital Hall effect and orbital -to-spin conversion in 3 d, 5d, and 4f metallic heterostructures. Phys. Rev. Res. 4, 033037 (2022)

work page 2022

[25] [25]

Li, T. et al. Giant Orbital-to-Spin Conversion for Efficient Current-Induced Magnetization Switching of Ferrimagnetic Insulator. Nano Lett. 23, 7174-7179 (2023)

work page 2023

[26] [26]

Yang, Y . et al. Orbital torque switching in perpendicularly magnetized materials. Nat. Commun. 15, 8645 (2024)

work page 2024

[27] [27]

Zhang, D. et al. Orbital torque switching of room temperature two -dimensional van der Waals ferromagnet Fe3GaTe2. Nat. Commun. 16, 7047 (2025)

work page 2025

[28] [28]

Gupta, R. et al. Harnessing orbital Hall effect in spin -orbit torque MRAM. Nat. Commun. 16, 130 (2025)

work page 2025

[29] [29]

Wang, P. et al. Orbitronics: Mechanisms, Materials and Devices. Adv. Electron. Mater. 11, 2400554 (2024)

work page 2024

[30] [30]

& Pai, C.-F

Hu, C.-Y ., Song, M.-Y ., Bao, X. & Pai, C.-F. Efficient Magnetization Switching via Orbital- to-Spin Conversion in Cr/W-Based Heterostructures. ACS Appl. Electron. Mater. 7, 4279- 4286 (2025)

work page 2025

[31] [31]

Lee, D. et al. Orbital torque in magnetic bilayers. Nat. Commun. 12, 6710 (2021)

work page 2021

[32] [32]

& Tulapurkar, A

Dutta, S. & Tulapurkar, A. A. Observation of nonlocal orbital transport and sign reversal of dampinglike torque in Nb/Ni and Ta/Ni bilayers. Phys. Rev. B 106, 184406 (2022)

work page 2022

[33] [33]

Song, Y . et al. Inefficiency of orbital Hall effect on the spin torque in transition metal/ferromagnet bilayers. Phys. Rev. Appl. 24, 034038 (2025)

work page 2025

[34] [34]

& Oppeneer, P

Salemi, L. & Oppeneer, P. M. First-principles theory of intrinsic spin and orbital Hall and Nernst effects in metallic monoatomic crystals. Phys. Rev. Mater. 6, 095001 (2022). 35.Wang, Y ., Ramaswamy, R. & Yang, H. FMR-related phenomena in spintronic devices. Phys. D: Appl. Phys. 51, 273002 (2018)

work page 2022

[35] [35]

Wang, Y . et al. Determination of intrinsic spin Hall angle in Pt. Appl. Phys. Lett. 105, 152412 (2014)

work page 2014

[36] [36]

Mellnik, A. R. et al. Spin-transfer torque generated by a topological insulator. Nature 511, 449-451 (2014)

work page 2014

[37] [37]

Wang, Y . et al. Topological Surface States Originated Spin-Orbit Torques in Bi2Se3. Phys. Rev. Lett. 114, 257202 (2015)

work page 2015

[38] [38]

Hayashi, H. et al. Observation of long -range orbital transport and giant orbital torque. Commun. Phys. 6, 32 (2023). 14

work page 2023

[39] [39]

Kim, J. et al. Layer thickness dependence of the current -induced effective field vector in Ta|CoFeB|MgO. Nat. Mater. 12, 240-245 (2013)

work page 2013

[40] [40]

& Ohno, H

Hayashi, M., Kim, J., Yamanouchi, M. & Ohno, H. Quantitative characterization of the spin-orbit torque using harmonic Hall voltage measurements. Phys. Rev. B 89, 144425 (2014)

work page 2014

[41] [41]

Hou, D. et al. Tunable Sign Change of Spin Hall Magnetoresistance in Pt/NiO/YIG Structures. Phys. Rev. Lett. 118, 147202 (2017)

work page 2017

[42] [42]

Qiu, Z. et al. Spin-current probe for phase transition in an insulator. Nat. Commun. 7, 12670 (2016)

work page 2016

[43] [43]

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