Observation of magnetic flux pinning in a thin Nb film with a square lattice of nickel dots

A. Terentiev, D. B. Watkins, L. E. De Long, D. J. Morgan, J. B. Ketterson

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22 Scopus citations


The pinning of magnetic flux by a square lattice of ferromagnetic Ni dots embedded in a superconducting Nb film was investigated. In the case of demagnetized Ni dots, both AC susceptibility and DC magnetization data exhibit clear anomalies at the first and second matching fields, H1≈13 Oe and H2 = 2H1, respectively. The second matching anomaly is clearly observed in both AC and DC data only when a remanent magnetization of Ni dots is induced along the external magnetic field, which is oriented perpendicular to the Nb film plane. The observed behavior supports theoretical predictions of a substantial contribution to the flux pinning energy by anisotropic interactions between the superconducting condensate of Nb and the Ni dot magnetization.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalPhysica C: Superconductivity and its Applications
Issue number1
StatePublished - Oct 15 1999

Bibliographical note

Funding Information:
Research at the University of Kentucky was supported by the US Department of Energy Office of Basic Energy Research, Division of Materials Science, under Grant #DE-FG02-97ER45653. Research at Northwestern University was supported by the Materials Research Center grant DMR-9309061.

ASJC Scopus subject areas

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


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