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

doi:10.1016/S0038-1098(01)00128-4

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 journal › Article › peer-review

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: B_R a rotational vortex-flux density which rotates rigidly with the sample, and B_F a frictional vortex-flux density which rotates frictionally relative to the sample and stays at a fixed angle (θ_F) 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 (τ_p/μ) which is represented by the experimental value Hsin(θ_F) decreases as H increases (τ_p/μ = Hsin(θ_F), where μ is the magnetic moment per vortex). This is consistent with the collective-pinning process of vortex bundling.

Original language	English
Pages (from-to)	387-389
Number of pages	3
Journal	Solid State Communications
Volume	118
Issue number	8
DOIs	https://doi.org/10.1016/S0038-1098(01)00128-4
Publication status	Published - May 23 2001
Externally published	Yes

Keywords

A. Superconductors
D. Flux pinning and creep

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

Access to Document

10.1016/S0038-1098(01)00128-4

Cite this

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title = "Rotational magnetic measurements of vortex flux pinning in Nb at 4.2 K",

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.",

keywords = "A. Superconductors, D. Flux pinning and creep",

author = "Al-Akhras, {M. H.} and Al-Omari, {I. A.} and Hasan, {M. K.} and Albiss, {B. A.}",

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doi = "10.1016/S0038-1098(01)00128-4",

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T1 - Rotational magnetic measurements of vortex flux pinning in Nb at 4.2 K

AU - Al-Akhras, M. H.

AU - Al-Omari, I. A.

AU - Hasan, M. K.

AU - Albiss, B. A.

PY - 2001/5/23

Y1 - 2001/5/23

N2 - 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.

AB - 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.

KW - A. Superconductors

KW - D. Flux pinning and creep

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DO - 10.1016/S0038-1098(01)00128-4

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EP - 389

JO - Solid State Communications

JF - Solid State Communications

IS - 8

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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