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REVIEW 2 major objections 4 minor 65 references

Foundry CMOS platform for multimodal quantum materials characterization

T0 review · 2 major / 4 minor · reviewed 2026-08-01 · deepseek-v4-flash

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Pith's one-line read A commercial 65-nm CMOS chip, repurposed as a passive platform, can perform cryogenic magnetic susceptibility measurements and low-power NV-center magnetometry without custom fabrication.

desk verdict A genuine integration result—RF, heater, and electrodes on one foundry CMOS chip—with a strong ODMR power benchmark and a robust qualitative susceptibility peak, undercut by an uncalibrated absolute susceptibility number that should be fixed before publication. read the letter →

arxiv 2607.18059 v1 pith:FYHI3C27 submitted 2026-07-20 cond-mat.mtrl-sci physics.ins-detquant-ph

Sharad Kumar Yadav , Luca Nessi , Ondrej Dyck , Jinchen Wang , Bogdan Dryzhakov , Alex Melendez , Huan Zhao , Qian Song
show 8 more authors
Doha Amer Cole Brabec Saleh Alqazlan Ruonan Han Riccardo Comin Stephen Jesse Dirk Englund Jawaher Almutlaq
This is my paper · ORCID
classification cond-mat.mtrl-sciphysics.ins-detquant-ph
keywords CMOSintegrationfoundryplatformquantummaterialscharacterizationnitrogen-vacancycentersODMRmagneticsusceptibilityFe3GeTe2cryogenic
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

This paper claims that a standard commercial 65-nm CMOS chip, built for digital and radio-frequency circuits, can be repurposed as a passive, foundry-manufacturable platform for characterizing quantum materials. The authors partition the chip's metal stack into an on-chip microwave inductor, a resistive heater, and interdigitated electrodes—all within a 1 mm² footprint—and demonstrate three functions: cryogenic magnetic susceptibility measurements of the van der Waals magnet Fe3GeTe2 at temperatures down to 1.75 K, room-temperature NV-center optically detected magnetic resonance with greater than 20% contrast at only 4–9 dBm microwave power, and compatible operation inside a scanning electron microscope. The significance lies in replacing experiment-specific hardware with a reproducible, mass-producible chip that delivers localized microwave fields, making quantum sensing and materials characterization cheaper, smaller, and more standardized.

What carries the argument

The load-bearing object is the on-chip octagonal loop inductor (four turns, 212 µm outer span, 10 µm conductor width, 2 µm spacing) fabricated in the top metal layers of the CMOS stack. Electromagnetic simulations and S-parameter measurements show that this inductor delivers a localized RF magnetic field within the central region, and the near-field localization is what allows high ODMR contrast (>20%) at only 4–9 dBm, a 20–25 dB power reduction compared to a commercial antenna. The platform also partitions lower metal layers into a resistive meander heater (M5–M6) and interdigitated electrodes (M7), giving thermal control and electrical interfacing in the same 1 mm² footprint.

What would settle it

Measure the RF magnetic field at the sample position (e.g., with a calibrated pick-up coil, a known paramagnet, or a spectroscopy-based field probe) and compare it with the electromagnetic simulation used to compute χ. If the measured field differs substantially, the absolute susceptibility claim fails even though the phase-transition peak remains.

Watch

Extended reading notes

Core claim

The paper's central discovery is that the existing metal stack of a commercial 65-nm CMOS process can be 'functionally partitioned' into the passive subsystems needed for quantum materials experiments. The integrated RF architecture—specifically a four-turn octagonal loop inductor on the top metal layers—concentrates microwave magnetic fields near the chip surface, enabling AC magnetic excitation and spin control. The authors validate the platform through three demonstrations: an hBN-encapsulated Fe3GeTe2 flake transferred directly onto the chip shows a magnetic susceptibility peak near 220 K (the known Curie temperature) with an absolute susceptibility of about 12.2; NV centers in diamond s

Load-bearing premise

The quantitative susceptibility value (χ ≈ 12.2) is computed using a simulated maximum inductor field that is not reported or experimentally calibrated; the qualitative peak at the known Curie temperature (220 K) is robust, but the absolute number depends on that uncalibrated simulation.

Editorial extensions

If this is right

  • If correct, quantum materials labs can replace custom-built antennas and sample-specific excitation structures with a standard foundry chip, improving reproducibility and reducing development time.
  • The 20–25 dB reduction in microwave power needed for NV-center ODMR would allow compact, low-power quantum sensors, possibly battery-powered or integrated into portable devices.
  • Because the chip is foundry-manufacturable, arrays of identical platforms could enable high-throughput, automated materials characterization across multiple laboratories.
  • The demonstrated compatibility with electron-beam imaging means the same chip can support combined structural, electrical, magnetic, and optical probes in one workflow.
  • The integrated heater and IDE open the door to temperature- and field-dependent studies of air-sensitive van der Waals materials without lithographic processing.

Reading between the lines

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

  • A natural extension is to calibrate the inductor's absolute field strength using a standard paramagnetic or superconducting sample, which would turn the susceptibility measurement from a relative peak into a quantitative magnetometer.
  • The near-field RF architecture could be adapted to other spin qubits and to pulsed or AC-modulated magnetometry, since the inductor supports kilohertz-to-megahertz field modulation that superconducting magnets cannot.
  • The 1 mm² platform suggests a route to dense arrays of independent measurement sites, each with its own heater and electrodes, enabling combinatorial screening of phase diagrams.
  • Combining this passive platform with existing cryo-CMOS active circuits (microwave generation, readout) could yield a fully integrated, autonomous materials-characterization system.
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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

2 major / 4 minor

Summary. The manuscript reports a CMOS chip fabricated in a commercial 65 nm process that integrates an RF octagonal inductor, a resistive meander heater, and interdigitated electrodes within a 1 mm2 footprint, with the metal stack partitioned by function. The authors demonstrate three applications: Kerr-rotation magnetic susceptibility measurements on hBN/Fe3GeTe2/hBN heterostructures transferred directly onto the chip at cryogenic temperatures, room-temperature ODMR on NV centers with >20% contrast at 4–9 dBm, and SEM imaging during device operation with no resolvable image degradation. The paper claims this establishes a scalable, foundry-manufacturable platform for multimodal quantum materials characterization.

Significance. If the results hold, the platform addresses a real need for reproducible, scalable hardware in quantum materials research. The foundry CMOS approach is attractive because it uses a standard commercial process, and the functional partitioning of the metal stack is a sensible design. The experimental demonstrations are relevant: the susceptibility measurement on an exfoliated air-sensitive flake without sample-specific lithography is a useful capability, and the direct benchmarking against a commercial antenna on the same microscope is a strength. The paper also provides open-source analysis code for the knife-edge SEM analysis, which supports reproducibility. The main quantitative weakness is the calibration of the absolute susceptibility, which is not documented.

major comments (2)
  1. [Magnetic susceptibility measurements] The absolute susceptibility χ≈12.2 is derived from an unreported simulated field value ('the maximum field value generated by the CMOS chip') and a bulk-literature remanent magnetization [23]. The conversion from Kerr rotation to ΔM is not described, no drive current is specified, and no uncertainty is propagated into χ or the detection limit (~0.75). Since χ scales linearly with the assumed field amplitude, the headline numerical value is not reproducible from the manuscript. Provide the simulated field value at the flake position, the applied inductor current, the calibration procedure linking Kerr rotation to magnetization units, and a full uncertainty budget.
  2. [Quantum control enabled by the CMOS RF architecture] The claimed '20–25 dB reduction in required power' relative to the commercial antenna is derived from a range comparison (24.6–30 dBm vs 4–9 dBm) that yields a spread of ~15.6 to 26.5 dB depending on the operating points chosen. Specify the exact pair of power levels used for the comparison (e.g., minimum power achieving ≥20% contrast in each case, or matched contrast) and show the corresponding data from the power sweep (Supplementary Fig. S4). Without this, the quantitative power-reduction claim is not uniquely determined.
minor comments (4)
  1. [References] References [22] and [23] are identical (May et al., PRB 93, 014411, 2016); merge them and update the in-text citations accordingly.
  2. [Quantum control enabled by the CMOS RF architecture] The magnetic sensitivity values (2.2–2.9 µT/√Hz) are reported without specifying the measurement parameters (e.g., integration time, photon collection rate, linewidth, and the formula used). Provide these details so the values are reproducible.
  3. [Data availability] The data availability statement says data are available 'upon request'. For a platform paper claiming reproducibility and scalability, depositing raw data and analysis scripts (beyond the knife-edge code) in a public repository would strengthen the contribution.
  4. [Magnetic susceptibility measurements] The phrase 'maximum field value generated by the CMOS chip' is ambiguous. Specify the drive current, frequency, and any matching conditions under which the field is defined; this is closely related to the major comment above but should be clarified even in a revised manuscript.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity; the platform demonstrations are direct measurements benchmarked against external references.

full rationale

The paper's central claims are experimental demonstrations, not derivations from fitted inputs. The magnetic susceptibility measurement uses Kerr rotation with AC excitation from the on-chip inductor; the reported χ ≈ 12.2 is converted using a literature remanent magnetization and an unreported simulated maximum field value. This is a calibration step using external and simulated inputs, not a fit to the target quantity, and the qualitative Tc peak at 220 K is checked against an external literature value. The ODMR power reduction claim is supported by a direct same-instrument comparison against a commercial antenna, and the SEM-compatibility analysis is a quantitative knife-edge study. Self-citations to prior CMOS NV work (Refs. 10–11) and cryo-CMOS work (Refs. 24–28) are contextual and not load-bearing for the new claims. No equation or parameter in the paper reduces by construction to the claimed output. The uncalibrated simulated field affecting absolute χ is a correctness/calibration concern, not circularity, because it is not derived from the susceptibility being reported.

Assumptions & free parameters 2 free parameters · 3 assumptions · 0 invented entities

No new physical entities are introduced. The central claim rests on two external calibration inputs (simulated inductor field, literature magnetization) and on standard assumptions about MOKE proportionality and benchmark fairness.

free parameters (2)
  • Simulated on-chip inductor magnetic field at sample = not reported
    Used to convert Kerr signal to absolute susceptibility χ≈12.2; the value is neither stated nor measured in the text (Magnetic susceptibility measurements section).
  • Remanent magnetization of Fe3GeTe2 from literature = implicit from ref [23]
    Assumed to apply to the measured flake for computing ΔM/ΔH; uncertainty from crystal-to-crystal variation is not accounted for.
assumptions (3)
  • domain assumption Kerr rotation signal is proportional to out-of-plane magnetization of Fe3GeTe2
    Standard MOKE assumption used to interpret hysteresis loops as magnetization switching and to extract susceptibility (Magnetic susceptibility measurements section).
  • domain assumption Commercial antenna vs on-chip inductor benchmark is a fair comparison
    Comparing transmitted power assumes the NV sensor is equivalently coupled in both cases; near-field localization is claimed as the mechanism, but a far-field antenna and a near-field inductor differ fundamentally (ODMR section).
  • domain assumption Foundry CMOS metal stack matches design values used in EM simulations
    S-parameter interpretation and field localization simulations rely on foundry-provided stack dimensions; no post-fabrication electrical verification of the exact geometry beyond SEM images.

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Cite this review

Pith. "Pith review of Foundry CMOS platform for multimodal quantum materials characterization." pith.science (2026). https://pith.science/paper/FYHI3C27

@misc{pith2026260718059,
  author       = {Pith},
  title        = {Pith review of: Foundry CMOS platform for multimodal quantum materials characterization},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/FYHI3C27}},
  note         = {Machine review of arXiv:2607.18059}
}
read the original abstract

Quantum materials experiments increasingly rely on microwave, electrical, thermal, optical, and structural probes, but these capabilities are typically assembled from custom hardware that limits reproducibility and scalability. Here we show that a commercial 65-nm CMOS process can be repurposed as a passive, foundry-manufacturable characterization platform by functionally partitioning its metal stack into microwave, thermal, and electrical subsystems within a 1 mm2 footprint. The integrated RF architecture enables cryogenic magnetic susceptibility measurements of Fe3GeTe2 heterostructures at 1.75 K without sample-specific fabrication. We further demonstrate NV-center optically detected magnetic resonance (ODMR) with >20% contrast at 4-9 dBm microwave power, reducing power requirements by 20-25 dB relative to conventional antenna-based approaches while maintaining sensitivities of 2-3 uT/sqrt(Hz). We additionally confirm compatibility with in-situ electron-beam imaging, showing no measurable degradation in image quality upon device operation. These results establish a scalable, foundry-manufacturable platform for multimodal quantum sensing and materials characterization.

Figures

Figures reproduced from arXiv: 2607.18059 by the authors.

Figure 1
Figure 1. Foundry-fabricated CMOS platform for multimodal materials characterization. Schematic illustration of the CMOS-integrated platform implemented in a commercial semiconductor pro￾cess. The architecture supports the heterogeneous integration and multimodal characterization of quantum materials. Insets highlight key platform components, including the integrated RF inductor, resistive heater, interdigitated electrodes (I… view at source ↗
Figure 2
Figure 2. Fabricated CMOS-integrated platform: architecture and subsystem characterization. (a) Schematic of the layered chip stack and corresponding functional partitioning of the CMOS metal layers, together with false-colored SEM images of the realized structures: the octagonal RF inductor (100 µm scale bar), the interdigitated-electrode (IDE) array (1 µm scale bar), and the resistive heater (50 µm scale bar). (b) False-col… view at source ↗
Figure 3
Figure 3. Cryogenic magnetic susceptibility measurements using the CMOS platform. Illus￾tration of the heterogeneous integration process, showing transfer of an encapsulated hBN/Fe3GeTe2/hBN heterostructure from the source substrate onto the foundry-fabricated CMOS characterization chip. (b) Op￾tical micrograph of the CMOS chip after transfer; inset shows the encapsulated heterostructure positioned over the integrated micro-i… view at source ↗
Figures from the paper (2 more)
Figure 4
Figure 4. Figure 4: Benchmarking the foundry CMOS platform against a commercial microwave antenna for low-power NV spin control. (a) Schematic of the scanning NV measurement configuration, showing optical excitation and microwave delivery from the on-chip RF inductor. (b) Optical microgra…
Figure 5
Figure 5. Figure 5: SEM compatibility of the CMOS platform during device operation. (a) Schematic of SEM imaging while the integrated inductor is electrically driven. (b–d) Representative SEM images acquired under different inductor bias conditions; corresponding FFTs are shown as insets.…

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Pith tools

Reviewed August 1, 2026 · model on record in the stance chip above.