Rotational magnetic measurements of vortex flux pinning in Nb at 4.2 K

M. H. Al-Akhras*, I. A. Al-Omari, M. K. Hasan, B. A. Albiss

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Magnetization vector (M) measurements were made on a thin disk of compact Nb powder at 4.2 K. Our results reveal that the vortex-flux density B consists of two components: BR a rotational vortex-flux density which rotates rigidly with the sample, and BF a frictional vortex-flux density which rotates frictionally relative to the sample and stays at a fixed angle (θF) relative to the applied field H. This indicates the existence of a broad distribution in the strength of vortex pinning centers. Moreover, the average pinning torque per vortex (τp/μ) which is represented by the experimental value Hsin(θF) decreases as H increases (τp/μ = Hsin(θF), where μ is the magnetic moment per vortex). This is consistent with the collective-pinning process of vortex bundling.

Original languageEnglish
Pages (from-to)387-389
Number of pages3
JournalSolid State Communications
Volume118
Issue number8
DOIs
Publication statusPublished - May 23 2001

Keywords

  • A. Superconductors
  • D. Flux pinning and creep

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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