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

doi:10.1016/S0921-4534(99)00452-9

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

Physics And Astronomy

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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
Pages (from-to)	1-8
Number of pages	8
Journal	Physica C: Superconductivity and its Applications
Volume	324
Issue number	1
DOIs	https://doi.org/10.1016/S0921-4534(99)00452-9
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

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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.",

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AU - Morgan, D. J.

AU - Ketterson, J. B.

N1 - 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.

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AB - 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.

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

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