Analysis of magnetization loops of electrospun nonwoven superconducting fabrics

Xian Lin Zeng, Thomas Karwoth, Michael R. Koblischka, Uwe Hartmann, Denis Gokhfeld, Crosby Chang, Thomas Hauet

研究成果: Article査読

19 被引用数 (Scopus)


Networks of superconducting Bi2Sr2CaCu2O8 (Bi-2212) nanowires were fabricated by the electrospinning technique. The nanowires have a diameter of the order of 150-200 nm and lengths up to the micrometer range and form a nonwoven, fabric-like network with numerous interconnections enabling a current flow between the nanowires. The porosity of this nanowire network is 0.9928. Therefore, this material represents a novel class of ultraporous high-temperature superconductors. The magnetizations of the nanowire networks [M(T) and M(H)] were recorded by SQUID magnetometry. The magnetic properties were analyzed using the extended critical state model (ECSM). It is supposed that the averaged diameter of the nanowires rules the magnetic field dependence of the critical current density of the nanowire network. Single nanowires have remarkably high values of the critical current density of 1.04×107A/cm2 at 5 K. The macroscopic critical current density less than ∼0.05A/cm2 at 5 K is fine for this lightweight material. Using ECSM, several important magnetic parameters could be determined including the penetration field Hp, the irreversibility fields Hirr, the upper critical field Hc2, and the flux pinning forces. Applications for this material class may be found in the direction of sensors, thin shielding layers, or nanoporous bulks.

ジャーナルPhysical Review Materials
出版ステータスPublished - 2017 9月 8

ASJC Scopus subject areas

  • 材料科学(全般)
  • 物理学および天文学(その他)


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