Planar MoRe-based direct current nanoSQUID

A. G. Shishkin, O. V. Skryabina, V. L. Gurtovoi, S. E. Dizhur*, M. I. Faley, A. A. Golubov, V. S. Stolyarov

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

We have developed planar nanoSQUID with nanobridge-type Josephson junctions based on the oxidation resistant and high H c2 MoRe alloy. The objective of the research was to reduce size of the SQUID loop with the aim being to reduce magnetic flux noise and improve the spatial resolution of the SQUID sensors. Employing RF-magnetron sputtering, electron-beam lithography, and reactive ion etching in CHF3 + O2 plasma using Al hard masks, we have realized nanoSQUIDs with Josephson junctions in the form of 30 - 50 nm wide nanobridges and an effective magnetic flux capture radius of ∼ 95 nm. The critical temperature of the fabricated devices was T c = 7.9 K. The I(V)-characteristics demonstrated critical current I 0≃ 114 µA at 4.2 K and modulation period in magnetic fields of ∼ 700 Oe.

Original languageEnglish
Article number065005
JournalSuperconductor science and technology
Volume33
Issue number6
DOIs
Publication statusPublished - Jun 2020

Keywords

  • Molybdenum Rhenium
  • MoRe
  • nanobridges
  • nanoSQUID
  • scanning SQUID microscopy

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