Levitation force from high-Tcsuperconducting thin-film disks

Anjali B. Riise, T. H. Johansen, H. Bratsberg, M. R. Koblischka, Y. Q. Shen

研究成果: Article査読

29 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)9855-9861
ページ数7
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
60
13
DOI
出版ステータスPublished - 1999
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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