Transport and magnetic properties of strong ferromagnetic pi-junctions

J. W. A. Robinson*, Samanta Piano, Gavin Burnell, Chris Bell, Mark G. Blamire, Chris Bell

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

5 Citations (Scopus)

Abstract

We have investigated the characteristic voltage dependence with ferromagnetic thickness in Josephson junctions consisting of conventional superconducting Nb electrodes and strongly ferromagnetic barriers: Co, Ni20Fe80(Py) and Ni. Strong oscillations in characteristic voltage suggestive of successive 0-Pi crossovers were observed with the thickness variation of the ferromagnetic layers. Such oscillations show excellent fits to existing theoretical models. The exchange energies of the Co, Py and Ni barriers have been estimated from the periodicity of the oscillations and found to be 309 meV, 201 meV and 80 meV respectively, which is in agreement with previous experimental and theoretical results. We also discuss magnetic behavior of our heterostructures and, in the case of Ni, we have determined its Curie temperature to be similar or equal to 571 K.

Original languageEnglish
Pages (from-to)641-644
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume17
Issue number2
DOIs
Publication statusPublished - Jun 2007
EventApplied Superconductivity Conference 2006 - Seattle, United Kingdom
Duration: 27 Aug 20061 Sep 2006

Keywords

  • SUPERCONDUCTING TRANSITION-TEMPERATURE
  • MULTILAYERS
  • FILMS
  • THICKNESS

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