Properties of superconductivity for decoupled ferromagnet/superconductor trilayers and multilayers in Fe/Nb system

S. Y. Huang*, S. F. Lee, Jun Jih Liang, C. Y. Yu, K. L. You, T. W. Chiang, Shih-ying Hsu, Y. D. Yao

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

The transition temperature Tc and upper critical field Hc2 of sputtered Fe/Nb trilayers and multilayers have been determined by measurement of electrical resistivity. For a fixed Fe layer thickness, Tc decreases with decreasing Nb thickness up to a critical thickness dNb crit ≈ 34 nm below which superconductivity vanishes. When the superconducting layers are thin ( dNb < 140 nm ) and decoupled by pair breaking in the ferromagnetic layers, the parallel critical field exhibits nonlinear temperature dependence, revealing a change in the superconducting dimensionality. The strong decrease of Tc with decreasing Nb thickness as well as the temperature dependence of Hc2 can be well described by theoretical model.

Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Volume304
Issue number1
DOIs
StatePublished - 1 Sep 2006

Keywords

  • Critical thickness
  • Dimensional crossover
  • Proximity effect

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