Ferromagnetic Artificial Pinning Centers in Multifilamentary Superconducting Wires

  • J.-Q. Wang
  • N. D. Rizzo
  • J. D. McCambridge
  • D. E. Prober
  • L. R. Motowidlo
  • B. A. Zeitlin
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)


We fabricated lnultifilamentary NbTi wires with ferromagnetic (FM) artificial pinning centers (APCs) to enhance the critical current density (Jc) in magnetic fields. We used a bundle and draw technique to process the APC wires with either Ni or Fe as the pinning centers. Both wires produced higher Jc in the high field range (5–9 T) than previous non-magnetic APC wires similarly processed, even though we have not yet optimized pin percentage. Using a magnetometer we found that the pins remained ferromagnetic for the wires with maximum Jc. However, we did observe a substantial loss of FM material for the wires where the pin diameter approached 3 nm. Thus, we expect further enhancement of Jc with better pin quality.


Coherence Length Final Size Large Filament Pinning Center Wire Size 
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Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • J.-Q. Wang
    • 1
  • N. D. Rizzo
    • 1
  • J. D. McCambridge
    • 1
  • D. E. Prober
    • 1
  • L. R. Motowidlo
    • 2
  • B. A. Zeitlin
    • 2
  1. 1.Department of Applied PhysicsYale UniversityNew HavenUSA
  2. 2.IGC-Advanced SuperconductorsWaterburyUSA

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