Abstract
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 language | English |
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Pages (from-to) | 1-8 |
Number of pages | 8 |
Journal | Physica C: Superconductivity and its Applications |
Volume | 324 |
Issue number | 1 |
DOIs | |
State | Published - 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