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arxiv: 2505.22789 · v2 · submitted 2025-05-28 · ❄️ cond-mat.mtrl-sci · eess.IV

PdNeuRAM: forming-free, multi-bit Pd/HfO2 ReRAM for energy-efficient neuromorphic computing

Erbing Hua , Theofilos Spyrou , Majid Ahmadi , Abdul Momin Syed , Hanzhi Xun , Laurentiu Braic , Ewout van der Veer , Nazek Elatab
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Anteneh Gebregiorgis Georgi Gaydadjiev Beatriz Noheda Said Hamdioui Ryoichi Ishihara Heba Abunahla
This is my paper

Pith reviewed 2026-05-19 12:46 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci eess.IV
keywords ReRAMforming-freeHfO2neuromorphic computingmemristorenergy efficiencymulti-bitSNN
0
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The pith

A Pd-O-Hf configuration in HfO2 ReRAM enables forming-free operation by facilitating room-temperature charge redistribution.

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

The paper develops PdNeuRAM, HfO2-based ReRAM devices that avoid the usual electroforming step needed to create conductive pathways. It achieves this through a Pd-O-Hf configuration that uses palladium's natural affinity to integrate with hafnium dioxide, allowing charge redistribution at room temperature. The devices operate at low voltages, support multiple resistance states, and show reduced variability compared to standard filamentary ReRAM. When placed in spiking neural networks, they cut programming energy by 43 percent and reading energy by 73 percent. A sympathetic reader would care because removing the forming step lowers power and area costs while raising endurance for neuromorphic hardware.

Core claim

Through material characterization the authors establish that a Pd-O-Hf configuration capitalizes on Pd's innate affinity for integrating into HfO2. This structure actively facilitates charge redistribution at room temperature, thereby eliminating the need for electroforming. The resulting ReRAM devices provide tunable resistance states for dense memory and reduce programming and reading energy when used with spiking neural networks.

What carries the argument

Pd-O-Hf configuration that facilitates charge redistribution at room temperature to eliminate electroforming

Load-bearing premise

The material characterization correctly identifies the Pd-O-Hf configuration as the causal mechanism for forming-free operation rather than other process variables or measurement artifacts.

What would settle it

Fabricating otherwise identical devices that lack the Pd-O-Hf interface and observing whether the forming-free property disappears.

read the original abstract

Memristor technology shows great promise for energy-efficient computing, yet it grapples with challenges like resistance drift and inherent variability. For filamentary Resistive RAM (ReRAM), one of the most investigated types of memristive devices, the expensive electroforming step required to create conductive pathways results in increased power and area overheads and reduced endurance. In this study, we present novel HfO2-based forming-free ReRAM devices, PdNeuRAM, that operate at low voltages, support multi-bit functionality, and display reduced variability. Through a deep understanding and comprehensive material characterization, we discover the key process that allows this unique behavior: a Pd-O-Hf configuration that capitalizes on Pd innate affinity for integrating into HfO2. This structure actively facilitates charge redistribution at room temperature, effectively eliminating the need for electroforming. Moreover, the fabricated ReRAM device provides tunable resistance states for dense memory and reduces programming and reading energy by 43% and 73%, respectively, using spiking neural networks (SNN). This study reveals novel mechanistic insights and delineates a strategic roadmap for the realization of power-efficient and cost-effective ReRAM 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 introduces PdNeuRAM, a forming-free Pd/HfO2 ReRAM device for neuromorphic computing. It claims that a Pd-O-Hf interfacial configuration, enabled by Pd's affinity for HfO2, permits room-temperature charge redistribution that eliminates the electroforming step required in conventional filamentary ReRAM. The devices are reported to operate at low voltages, exhibit multi-bit states with reduced variability, and deliver 43% lower programming energy and 73% lower reading energy when integrated into spiking neural networks.

Significance. If the mechanism is robustly isolated and the performance metrics hold under statistical validation, the work would address a key practical barrier (electroforming overhead) in ReRAM-based neuromorphic hardware, potentially enabling lower-power, higher-density implementations.

major comments (2)
  1. [Device fabrication and material characterization sections] The attribution of forming-free behavior specifically to the Pd-O-Hf configuration (abstract and results on material characterization) is not isolated from fabrication variables. No side-by-side control experiments are described that fix HfO2 deposition, thickness, and annealing while varying only the top electrode (Pd versus Pt or TiN), leaving open the possibility that differences in oxygen-vacancy density, stoichiometry, or interface roughness account for the observed yield.
  2. [Electrical characterization and device performance] Statistical evidence for reproducibility is insufficient. Forming-voltage distributions or yield statistics across multiple batches or wafers are not reported, which is required to substantiate the claim that the Pd-O-Hf structure reliably eliminates electroforming rather than reflecting process-specific artifacts.
minor comments (2)
  1. [Neuromorphic application results] The energy-reduction percentages (43% programming, 73% reading) in the SNN section should include explicit details on the network topology, spike-rate assumptions, and baseline comparison device used for the calculation.
  2. [Figures and captions] Figure captions and axis labels in the material-characterization panels should explicitly state the measurement conditions (e.g., XPS binding-energy calibration, TEM sample preparation) to allow direct comparison with literature.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the thorough review and valuable suggestions. We address the major comments below and will revise the manuscript accordingly to enhance the clarity and robustness of our claims regarding the PdNeuRAM devices.

read point-by-point responses

  1. Referee: [Device fabrication and material characterization sections] The attribution of forming-free behavior specifically to the Pd-O-Hf configuration (abstract and results on material characterization) is not isolated from fabrication variables. No side-by-side control experiments are described that fix HfO2 deposition, thickness, and annealing while varying only the top electrode (Pd versus Pt or TiN), leaving open the possibility that differences in oxygen-vacancy density, stoichiometry, or interface roughness account for the observed yield.

    Authors: We recognize the importance of isolating the contribution of the Pd-O-Hf configuration through controlled experiments. While our manuscript presents detailed material characterization (XPS, TEM) demonstrating the Pd integration into HfO2 and its role in room-temperature charge redistribution, we did not include explicit comparisons with alternative top electrodes under identical HfO2 conditions. To strengthen this aspect, we will add data from control devices fabricated with Pt and TiN top electrodes, maintaining the same HfO2 deposition parameters. This will help confirm that the forming-free behavior is indeed attributable to the Pd-O-Hf interface rather than other process variables. revision: yes

  2. Referee: [Electrical characterization and device performance] Statistical evidence for reproducibility is insufficient. Forming-voltage distributions or yield statistics across multiple batches or wafers are not reported, which is required to substantiate the claim that the Pd-O-Hf structure reliably eliminates electroforming rather than reflecting process-specific artifacts.

    Authors: We agree that broader statistical validation is necessary to support the reproducibility of the forming-free operation. The presented results include measurements from numerous devices showing low variability and consistent low-voltage operation. However, we acknowledge the lack of forming-voltage distributions and yield data from multiple independent batches or wafers. In the revised manuscript, we will include additional statistics from devices across different fabrication runs to demonstrate that the elimination of electroforming is a reliable feature of the Pd-O-Hf configuration and not an artifact of specific process conditions. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental claim with no derivation chain

full rationale

The paper advances its central claim—that a Pd-O-Hf configuration enables room-temperature charge redistribution and eliminates electroforming—solely through material characterization and device measurements. No equations, fitted parameters, predictions, or mathematical derivations appear in the provided text. The argument rests on direct experimental observation rather than any self-referential reduction, self-citation load-bearing step, or ansatz smuggled via prior work. This is the most common honest finding for purely experimental materials papers that do not invoke uniqueness theorems or rename known results.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The work is experimental and relies on standard materials science assumptions about device fabrication and electrical testing rather than explicit free parameters or invented entities.

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Lean theorems connected to this paper

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

  • IndisputableMonolith/Cost/FunctionalEquation.lean washburn_uniqueness_aczel unclear
    ?
    unclear

    Relation between the paper passage and the cited Recognition theorem.

    a Pd–O–Hf configuration that capitalizes on Pd innate affinity for integrating into HfO2-x. This structure actively facilitates charge redistribution at room temperature, effectively eliminating the need for electroforming.

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
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uses
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contradicts
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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

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    Gu, D., Dey, S.K., Majhi, P.: Effective work function of pt, pd, and re on atomic layer deposited hfo2. Applied Physics Letters89(8) (2006) 22 Acknowledgements This work was supported by Delft University of Technology. We acknowledge the kind support of the Delft Kavli Nanofabrication cleanroom, especially Marinus Fischer, Roald van der Kolk, Charles de B...

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    These vacan- cies are primarily generated during the sputtering process [35] and through reactive interactions between titanium (Ti) and nonstoichiometric hafnium oxide, HfO2−x

    Doubly positively charged oxygen vacancies formation Within pristine PtHT devices, the formation of doubly charged oxygen vacancies, V 2+ O , is inherently expected in amorphous hafnia-based PtHT devices. These vacan- cies are primarily generated during the sputtering process [35] and through reactive interactions between titanium (Ti) and nonstoichiometr...

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    Further validation of Pd-O-Hf configuration presence Meanwhile, a finding that is corroborated byAFMmeasurements (Fig. S6a, b). Sta- tistical analysis shows that the Pd film exhibits a roughness of 715 pm, markedly lower than the 1087 pm measured for the Pt film, implying that the Pd surface is less prone to form spikes [49] and thereby reduces potential ...

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    Based on this model (withS= 0.52, see ref

    MIGS model explanation The MIGS model attributesSBHpinning to a finite density of metal Fermi energy, we use the relation: ϕBn =S [ ϕM −χHfO2 ] + (1−S) [ ECNL −E CBM ] (1) whereϕBn is the Schottky barrier height,ϕM represents the effective work function of the metal,Sis the pinning factor at the metal/HfO2-x interface,E CNL is the charge neutrality level ...

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    Study on the SBH for Pd/HfO2-x and Pt/HfO2-x Apart from the aforementioned observations and analyses, we also investigated the band structures and Schottky barriers of the PdHT and PtHT memristors to ascer- tain whether the forming-free behavior arises from differences in Schottky barrier heights. From previous studies [45, 51–53], it is well established ...

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