Critical currents of ion-beam sputtered amorphous beryllium thin films and their application to an Abrikosov vortex memory

Minoru Okamoto, Koji Takei, Shugo Kubo, Masashi Mukaida, Kazunori Miyahara

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Critical current and flux pinning were examined for ion-beam sputtered (IBS) amorphous beryllium (a-Be) thin films with Tc 6 K. Pinning forces in IBS a-Be films were one or more than one order of magnitude smaller than those for crystalline superconductors, but were still rather large for amorphous superconductors. The viscosity coefficient for IBS a-Be was very small, 1-2×10-9 N s/m2, which was only a few tenths as large as viscosity coefficients for other metallic superconductors. Write operation characteristics for Abrikosov vortex memory with an IBS a-Be vortex storage region was tested. The write current level was reduced to about two thirds of that for fine-grained PbInAu previously reported. IBS a-Be films were proved to be a potential material for use in an Abrikosov vortex memory.

Original languageEnglish
Pages (from-to)212-215
Number of pages4
JournalJournal of Applied Physics
Volume62
Issue number1
DOIs
Publication statusPublished - Dec 1 1987
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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