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arxiv: 2605.18586 · v1 · pith:634NT5GPnew · submitted 2026-05-18 · ❄️ cond-mat.supr-con

Phase dynamics and dissipation in tunnel ferromagnetic Josephson junctions

F. Calloni , R. Satariano , R. Ferraiuolo , H.G. Ahmad , D. Gatta , E. Raja , G. Santo , G. Serpico
show 11 more authors
R. Vydyasagar D. Montemurro N. Poccia A. Vettoliere G. Ausanio C. Granata L. Parlato G.P. Pepe A. Bruno F. Tafuri D. Massarotti
This is my paper

Pith reviewed 2026-05-20 08:08 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con
keywords ferromagnetic Josephson junctionstunnel junctionsphase dynamicsquantum phase diffusionswitching current distributionssuperconducting circuitshybrid devicesescape dynamics
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The pith

Parameters from current-voltage fits in tunnel ferromagnetic Josephson junctions match those from switching measurements.

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

This paper examines Josephson junctions that incorporate a thin ferromagnetic interlayer between superconducting electrodes. It compares devices made with niobium or aluminum electrodes across lateral sizes from micrometers to submicrometers. The authors fit the measured current-voltage curves to a standard tunnel-junction model and extract key parameters such as critical current and resistance. These parameters turn out to be consistent with independent estimates obtained from the statistical distributions of switching currents. The match holds particularly well for the smallest aluminum-based junctions, which also display the phase-diffusion signatures seen in quantum bits.

Core claim

The parameters extracted from the fitting of the current-voltage characteristics using the tunnel junction microscopic model are found to be consistent with those independently estimated from switching current distribution measurements. Submicrometric Al-based devices exhibit electrodynamic properties comparable to those implemented in state-of-the-art transmon qubits and display clear signatures of quantum phase diffusion. The strong agreement between transport modelling and escape dynamics establishes a robust framework for describing hybrid ferromagnetic Josephson junctions consistent with their energy scales.

What carries the argument

Consistency between parameters obtained by fitting current-voltage curves to the tunnel-junction microscopic model and those derived from switching-current distribution statistics.

If this is right

  • Submicrometric aluminum-based junctions possess electrodynamic properties comparable to those used in transmon qubits.
  • These junctions exhibit clear signatures of quantum phase diffusion.
  • The consistent description supports integration of such hybrid junctions into superconducting quantum circuits.
  • The same framework applies to classical digital superconducting circuits.
  • The description remains consistent with the energy scales of the junctions.

Where Pith is reading between the lines

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

  • The validated model could be used to predict behavior when the ferromagnetic interlayer is replaced by other magnetic materials.
  • Similar consistency checks might help assess whether non-tunnel conduction channels appear at still smaller lateral dimensions.
  • If the agreement persists, these junctions could serve as tunable elements whose magnetic state controls the Josephson phase without adding extra loss.

Load-bearing premise

The tunnel-junction microscopic model used to fit the current-voltage curves fully describes the electrodynamic behavior without significant unaccounted dissipation or non-tunnel contributions over the range of materials and sizes tested.

What would settle it

Observation of switching-current distributions or escape rates in submicrometric aluminum junctions that deviate markedly from the values predicted by the parameters fitted to the current-voltage curves.

read the original abstract

We investigate tunnel ferromagnetic Josephson junctions based on Superconductor-Insulator-thin superconductor-Ferromagnet-Superconductor multilayers. A comparative study of their electrodynamic properties is performed for junctions with niobium and aluminum (Al) electrodes, featuring different ferromagnetic interlayer materials and lateral dimensions ranging from the micrometric to the submicrometric scale. The parameters extracted from the fitting of the current-voltage characteristics using the tunnel junction microscopic model are found to be consistent with those independently estimated from switching current distribution measurements. Submicrometric Al-based devices exhibit electrodynamic properties comparable to those implemented in state-of-the-art transmon qubits and display clear signatures of quantum phase diffusion. The strong agreement between transport modelling and escape dynamics establishes a robust framework for describing hybrid ferromagnetic Josephson junctions consistent with their energy scales and supports their potential integration into superconducting quantum and classical digital circuits.

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 investigates the phase dynamics and dissipation in tunnel ferromagnetic Josephson junctions based on S-I-s-F-S multilayers. A comparative analysis is conducted for devices with Nb and Al electrodes, different ferromagnetic interlayers, and dimensions from micro- to sub-micrometric scales. The authors fit the current-voltage characteristics using a tunnel junction microscopic model and report consistency with parameters independently estimated from switching current distribution measurements. Submicrometric Al-based junctions show electrodynamic properties similar to those in transmon qubits and exhibit signatures of quantum phase diffusion. The paper concludes that the agreement between transport modeling and escape dynamics provides a robust framework for these hybrid junctions, consistent with their energy scales, and supports their potential integration into superconducting quantum and classical digital circuits.

Significance. This work could be significant for the development of hybrid superconductor-ferromagnet devices in quantum information processing. By establishing consistency between different measurement techniques for the junction parameters, it provides evidence that the tunnel model accurately describes the electrodynamics in these systems. The demonstration of quantum phase diffusion in submicrometric devices is particularly relevant for applications in superconducting qubits and digital circuits. The comparative study across different materials and sizes offers insights into scaling and material choices for practical implementations.

major comments (2)
  1. [Abstract and fitting/escape dynamics sections] The central claim rests on the 'strong agreement' between parameters extracted from I-V characteristics (using the tunnel junction microscopic model) and those from switching current distribution measurements. However, both analyses interpret the data through the same underlying model assumptions regarding the washboard potential, damping, and critical current (likely an RCSJ framework). This shared modeling choice risks circularity, as any unaccounted ferromagnetic-induced dissipation or non-tunnel channel would consistently affect both datasets without being independently detected. A concrete test, such as comparison to an alternative model or direct measurement of dissipation channels, is needed to establish independence. (Abstract; see also the sections describing the fitting procedure and escape dynamics analysis.)
  2. [Abstract and results on parameter consistency] The abstract reports parameter consistency but provides no visible full datasets, error bars, fit quality metrics (e.g., reduced chi-squared), or explicit exclusion criteria for the I-V and switching data. Without these, the robustness of the claimed agreement cannot be fully evaluated, particularly for submicrometric Al devices where quantum phase diffusion is asserted. (Abstract; Table or Figure presenting fitted parameters and distributions.)
minor comments (2)
  1. [Methods or modeling section] Clarify the exact form of the tunnel junction microscopic model employed for I-V fitting, including any specific expressions for the current-phase relation or damping term, to allow readers to reproduce the parameter extraction.
  2. [Figures] Add scale bars or explicit lateral dimension labels to figures showing device micrographs for the micro- to sub-micrometric junctions to improve clarity on size-dependent behavior.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and the constructive comments. We address the two major points below, defending the independence of our analyses while agreeing to improve the presentation of quantitative details.

read point-by-point responses

  1. Referee: The central claim rests on the 'strong agreement' between parameters extracted from I-V characteristics (using the tunnel junction microscopic model) and those from switching current distribution measurements. However, both analyses interpret the data through the same underlying model assumptions regarding the washboard potential, damping, and critical current (likely an RCSJ framework). This shared modeling choice risks circularity, as any unaccounted ferromagnetic-induced dissipation or non-tunnel channel would consistently affect both datasets without being independently detected. A concrete test, such as comparison to an alternative model or direct measurement of dissipation channels, is needed to establish independence.

    Authors: We respectfully disagree that the agreement is circular. The I-V fitting uses a microscopic tunnel model that explicitly calculates the supercurrent and quasiparticle current through the ferromagnetic interlayer, extracting parameters such as the critical current density and normal-state resistance from DC transport data. The switching current distributions, by contrast, measure the statistics of stochastic phase escapes over the barrier under bias, yielding independent estimates of damping and effective critical current from the dynamics. These observables are physically distinct—one is steady-state current-voltage response, the other is fluctuation-driven switching—and their consistency validates the model assumptions rather than assuming them. We have not detected signatures of non-tunnel channels in the data. We will add a short clarifying paragraph on this independence in the revised manuscript. revision: partial

  2. Referee: The abstract reports parameter consistency but provides no visible full datasets, error bars, fit quality metrics (e.g., reduced chi-squared), or explicit exclusion criteria for the I-V and switching data. Without these, the robustness of the claimed agreement cannot be fully evaluated, particularly for submicrometric Al devices where quantum phase diffusion is asserted.

    Authors: We agree that additional quantitative information would strengthen the presentation. In the revised version we will include a table with all extracted parameters, their uncertainties, reduced chi-squared values for the I-V fits, and explicit criteria used for data selection. Full datasets for the submicrometric Al devices will be provided in the supplementary material to allow independent assessment of the quantum phase diffusion signatures. revision: yes

Circularity Check

0 steps flagged

No significant circularity; cross-validation between independent datasets

full rationale

The central claim rests on consistency between parameters fitted to I-V curves via the tunnel junction model and those estimated from switching current distributions. These are distinct experimental probes (transport vs. escape dynamics) on the same devices, providing external grounding rather than a reduction by construction. No self-definitional steps, fitted inputs renamed as predictions, or load-bearing self-citations appear in the derivation. The model assumptions are stated explicitly and the agreement is presented as empirical support, not tautological.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The central claim rests on the applicability of the standard tunnel junction microscopic model to these hybrid devices and on the assumption that switching current distributions provide an independent measure of the same energy scales. No new entities are postulated.

free parameters (1)
  • fitted junction parameters (critical current, resistance, etc.)
    Extracted from I-V characteristic fits using the tunnel model; values are data-dependent and central to the consistency claim.
axioms (1)
  • domain assumption Tunnel junction microscopic model accurately describes electrodynamics of S-I-S-F-S multilayers
    Invoked when fitting current-voltage characteristics and comparing to escape dynamics.

pith-pipeline@v0.9.0 · 5764 in / 1264 out tokens · 28896 ms · 2026-05-20T08:08:12.263657+00:00 · methodology

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