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

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

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Flux pinning
flux pinning
Magnetic variables measurement
magnetic measurement
Vortex flow
vortices
flux density
Fluxes
guy wires
Magnetic moments
Powders
torque
Magnetization
Torque
magnetic moments
magnetization

Keywords

  • A. Superconductors
  • D. Flux pinning and creep

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Rotational magnetic measurements of vortex flux pinning in Nb at 4.2 K. / Al-Akhras, M. H.; Al-Omari, I. A.; Hasan, M. K.; Albiss, B. A.

In: Solid State Communications, Vol. 118, No. 8, 23.05.2001, p. 387-389.

Research output: Contribution to journalArticle

Al-Akhras, M. H. ; Al-Omari, I. A. ; Hasan, M. K. ; Albiss, B. A. / Rotational magnetic measurements of vortex flux pinning in Nb at 4.2 K. In: Solid State Communications. 2001 ; Vol. 118, No. 8. pp. 387-389.
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