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Communication Dans Un Congrès Année : 2022

Samples for 3rd Harmonic Magnetometry Assessment of NbTiN-Based SIS Structures

David Beverstock
  • Fonction : Auteur
Jean Delayen
  • Fonction : Auteur
Dennis Manos
  • Fonction : Auteur
Iresha Senevirathne
  • Fonction : Auteur
Joshua Spradlin
  • Fonction : Auteur
Anne-Marie Valente-Feliciano
  • Fonction : Auteur

Résumé

In the quest for alternative superconducting materials to bring accelerator cavity performance beyond the bulk niobium (Nb) intrinsic limits, a promising concept uses superconductor-insulator-superconductor (SIS) thin film structures that allows magnetic flux shielding in accelerator cavities to higher fields [1]. Candidate materials for such structures are NbTiN as the superconductor and AlN as the insulator. We have demonstrated high quality NbTiN and AlN deposited by reactive DC magnetron sputtering (DCMS), both for individual layers and multilayers. Interface quality has been assessed for bilayer stacks with 250 nm NbTiN layers and AlN thicknesses from 30 nm down to1 nm. These SIS structures show continued sharp interfaces with total average roughness under 2 nm. The Hfp enhancement of the films will be examined with a 3rd harmonic magnetometry. The system is being designed and built in a continuing collaboration with CEA Saclay. It can measure 25 to 50 mm samples on a temperature controlled stage. This contribution presents an overview of the design of the 3rd harmonic magnetometer and the material properties assessment of standalone films and multilayer nanostructures.

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Dates et versions

hal-03960228 , version 1 (27-01-2023)

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Citer

David Beverstock, Claire Antoine, Jean Delayen, Dennis Manos, Iresha Senevirathne, et al.. Samples for 3rd Harmonic Magnetometry Assessment of NbTiN-Based SIS Structures. 20th International Conference on RF Superconductivity, Jun 2021, Online Conference, United States. pp.SUPTEV016, ⟨10.18429/JACoW-SRF2021-SUPTEV016⟩. ⟨hal-03960228⟩
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