Levitation force from high-Tcsuperconducting thin-film disks

Anjali B. Riise, T. H. Johansen, H. Bratsberg, Michael Rudolf Koblischka, Y. Q. Shen

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Experimental studies and theoretical modeling of the levitation force between a permanent magnet and superconducting thin film are reported. Measurements of the force Fzand magnetic stiffness κz=δFzz as functions of the magnet-superconductor separation z, show several features contrasting all previous levitation force data for bulk superconductors. In particular, the Fz(z) curves measured for decreasing and increasing separation form hysteresis loops of nearly symmetrical shape, also displaying a peak in the repulsive force branch. Recent theories for flux penetration in thin type-II superconductors in transverse magnetic fields are invoked to explain the results, which were obtained using a cylindrical Nd-Fe-B magnet and a YBa2Cu3O7-δcircular disk made by laser ablation. We derive explicit formulas for both Fzand κz, reproducing quantitatively all the features seen experimentally.

Original languageEnglish
Pages (from-to)9855-9861
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number13
DOIs
Publication statusPublished - 1999 Jan 1
Externally publishedYes

Fingerprint

levitation
Superconducting materials
Thin films
Magnets
thin films
Superconducting films
magnets
Laser ablation
Hysteresis loops
Permanent magnets
Stiffness
permanent magnets
Magnetic fields
Fluxes
laser ablation
stiffness
penetration
hysteresis
curves
magnetic fields

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Levitation force from high-Tcsuperconducting thin-film disks. / Riise, Anjali B.; Johansen, T. H.; Bratsberg, H.; Koblischka, Michael Rudolf; Shen, Y. Q.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 60, No. 13, 01.01.1999, p. 9855-9861.

Research output: Contribution to journalArticle

Riise, Anjali B. ; Johansen, T. H. ; Bratsberg, H. ; Koblischka, Michael Rudolf ; Shen, Y. Q. / Levitation force from high-Tcsuperconducting thin-film disks. In: Physical Review B - Condensed Matter and Materials Physics. 1999 ; Vol. 60, No. 13. pp. 9855-9861.
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