Finite-size effect on vortex loop excitation in amorphous-W/Si multilayers

Y. Matsuo, T. Nojima, E. Majková, Y. Kuwasawa

研究成果: Article査読

4 被引用数 (Scopus)


A finite size effect on vortex configuration is investigated by the measurements of current-voltage (I-V) characteristics on amorphous-W/Si multilayers as a function of the number of the bilayers N in the absence of field. Critical scaling analysis of the data for the samples with N ≥ 10 shows that the vortex loops are the favored excitation with the dynamic critical exponent z ∼ 3.32, while for 10 > N ≥ 3 it reveals to deviate from the scaling function corresponding with a finite size effect on vortex loops. At a small current density, the vortex loop is probed at a length scale larger than the total sample thickness. A remarkable change in the I-V characteristics is observed between N = 3 and 2. This indicates the vortex configuration crossover to vortex-antivortex string pairs piercing all layers at N = 2. In sample with N = 1, the typical KT transition is observed.

ジャーナルPhysica C: Superconductivity and its applications
出版ステータスPublished - 1998 4 10

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
  • エネルギー工学および電力技術
  • 電子工学および電気工学


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