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

*المؤلف المقابل لهذا العمل

نتاج البحث: المساهمة في مجلةمراجعة النظراء

ملخص

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.

اللغة الأصليةEnglish
الصفحات (من إلى)387-389
عدد الصفحات3
دوريةSolid State Communications
مستوى الصوت118
رقم الإصدار8
المعرِّفات الرقمية للأشياء
حالة النشرPublished - مايو 23 2001
منشور خارجيًانعم

ASJC Scopus subject areas

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  • ???subjectarea.asjc.3100.3104???
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