Investigation of the Critical Currents in Thin-Film MoGe Devices

Ivan P. Nevirkovets*, Scott T. Grudichak, Mikhail Belogolovskii, John B. Ketterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We report on flux-flow properties of 50 nm thick thin-film amorphous MoGe bridges of different sizes with and without patterned sub-micron holes with different diameters and spacings. Characterization of the devices was carried out in liquid He at 4.2 K in a magnetic field, H, applied perpendicular to the device plane. Two critical currents, Ic1 and Ic2, were studied. The current Ic1 is identified as the onset of a low-resistance state, whereas Ic2 is the current at which the device switches to a high-resistance state, and the corresponding dependences Ic1(H) and Ic2(H) were determined. In the absence of the holes, Ic1 decreases monotonically with H, whereas Ic2(H) manifests lobes resembling those in the Fraunhofer-like pattern characteristic of Josephson junctions. This behavior may be due to formation of an ordered vortex lattice in some current and field ranges. Introducing the hole-line arrays modifies both Ic1(H) and Ic2(H) in a way that is most complicated for larger hole diameters.

Original languageEnglish (US)
Article number8000304
Pages (from-to)1-4
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume34
Issue number3
DOIs
StatePublished - May 1 2024

Keywords

  • Flux flow
  • hole arrays
  • magnetic vortices
  • superconducting microbridges
  • superconductivity
  • thin films

ASJC Scopus subject areas

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

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