Reduced Critical Current Spread in Planar MgB 2 Josephson Junction Array Made by Focused Helium Ion Beam

Leila Kasaei, Thomas Melbourne, Mengjun Li, Viacheslav Manichev, Fei Qin, Hussein Hijazi, Leonard C Feldman, Torgny Gustafsson, Bruce A. Davidson, Xiaoxing Xi, Ke Chen

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have fabricated series arrays of closely spaced planar Josephson junctions on MgB 2 films using a 30 keV focused helium ion beam. Uniformity of junction parameters within the arrays is sufficient for achieving phase-lock into an applied microwave signal, and flat giant Shapiro steps are observed. The spread in critical current of a 60-Josephson junction array is estimated to be less than 3.5%, significantly better than reported in MgB 2 junctions fabricated by other techniques. These results demonstrate the potential of the focused He + ion beam irradiation technique in MgB 2 Josephson multi-junction circuit applications such as quantum voltage standards.

Original languageEnglish
Article number8661661
JournalIEEE Transactions on Applied Superconductivity
Volume29
Issue number5
DOIs
Publication statusPublished - Aug 1 2019

Fingerprint

Helium
helium ions
Critical currents
Focused ion beams
Josephson junctions
Ion beams
critical current
ion beams
Microwaves
Irradiation
Networks (circuits)
Electric potential
microwaves
irradiation
electric potential

Keywords

  • Focused helium ion microscope (HIM)
  • Josephson junction and series array
  • lumped array
  • MgB
  • voltage metrology

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Reduced Critical Current Spread in Planar MgB 2 Josephson Junction Array Made by Focused Helium Ion Beam . / Kasaei, Leila; Melbourne, Thomas; Li, Mengjun; Manichev, Viacheslav; Qin, Fei; Hijazi, Hussein; Feldman, Leonard C; Gustafsson, Torgny; Davidson, Bruce A.; Xi, Xiaoxing; Chen, Ke.

In: IEEE Transactions on Applied Superconductivity, Vol. 29, No. 5, 8661661, 01.08.2019.

Research output: Contribution to journalArticle

Kasaei, L, Melbourne, T, Li, M, Manichev, V, Qin, F, Hijazi, H, Feldman, LC, Gustafsson, T, Davidson, BA, Xi, X & Chen, K 2019, ' Reduced Critical Current Spread in Planar MgB 2 Josephson Junction Array Made by Focused Helium Ion Beam ', IEEE Transactions on Applied Superconductivity, vol. 29, no. 5, 8661661. https://doi.org/10.1109/TASC.2019.2903418
Kasaei, Leila ; Melbourne, Thomas ; Li, Mengjun ; Manichev, Viacheslav ; Qin, Fei ; Hijazi, Hussein ; Feldman, Leonard C ; Gustafsson, Torgny ; Davidson, Bruce A. ; Xi, Xiaoxing ; Chen, Ke. / Reduced Critical Current Spread in Planar MgB 2 Josephson Junction Array Made by Focused Helium Ion Beam In: IEEE Transactions on Applied Superconductivity. 2019 ; Vol. 29, No. 5.
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