Flux pinning in multifilamentary superconducting wires with ferromagnetic artificial pinning centers

Author

Wang, J.-Q. ; Rizzo, N.D. ; Prober, D.E. ; Motowidlo, L.R. ; Zeitlin, B.A.

Author_Institution

Dept. of Appl. Phys. & Phys., Yale Univ., New Haven, CT, USA

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

1130

Lastpage

1133

Abstract

We demonstrate that ferromagnets are effective artificial pinning centers for the enhancement of critical current (J/sub c/) in multifilamentary superconducting wires. We have analyzed theoretically the proximity effect due to the FM pins near the final size of several nanometers and determined that one should achieve a large pinning force by such centers at these sizes. There is also additional pinning strength resulting from the interaction between ferromagnetic moments of the pins and the magnetic field gradient of the fluxon lattice. The measured results of J/sub c/, T/sub c/ and H/sub c2/ are analyzed, and compared with our model analysis.

Keywords

critical current density (superconductivity); ferromagnetic materials; flux pinning; flux-line lattice; magnetic moments; multifilamentary superconductors; proximity effect (superconductivity); superconducting critical field; superconducting transition temperature; critical current; ferromagnetic artificial pinning centers; ferromagnetic moments; flux pinning; fluxon lattice; magnetic field gradient; multifilamentary superconducting wires; pinning strength; proximity effect; Flux pinning; Iron; Magnetic analysis; Magnetic flux; Multifilamentary superconductors; Physics; Pins; Superconducting filaments and wires; Superconducting magnets; Superconducting materials;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.620690

Filename

620690