Hysteresis losses and magnetic phenomena in oscillating disks of type II superconductors

Hysteresis losses and the behavior of the magnetic flux threading superconducting disks of Nb oscillating slowly over various angular displacements in static magnetic fields H0 directed perpendicular to the axis of rotation have been investigated by continuously monitoring 〈Bz〉 and 〈By〉, the average...

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Veröffentlicht in:J. Appl. Phys.; (United States) 1982-03, Vol.53 (3), p.1631-1648
Hauptverfasser: Cave, J. R., LeBlanc, M. A. R.
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LeBlanc, M. A. R.
description Hysteresis losses and the behavior of the magnetic flux threading superconducting disks of Nb oscillating slowly over various angular displacements in static magnetic fields H0 directed perpendicular to the axis of rotation have been investigated by continuously monitoring 〈Bz〉 and 〈By〉, the average components of the magnetic induction, in the plane of the disk, parallel and perpendicular to H0. A simple model proposed previously satisfactorily accounts for the initial changes, starting from various initial flux configurations, the subsequent cyclical behavior, and the hysteresis losses. Expulsion of flux from the disk occurs during part of the first oscillation, then the amount of flux threading the disk remains constant during the subsequent oscillations, although the orientation distribution of the flux profile undergoes spectacular periodic variations. The analysis shows that dψ/dx = ±k dB/dx describes the orientation of the sheets of flux lines with respect to H0 with distance from the flat surfaces. dB/dx is the critical gradient of flux density and k(T) is the shearing parameter of the flux lattice for the sample. The surface step, ignored in the previous work, is introduced in the model using simple approximations.
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Expulsion of flux from the disk occurs during part of the first oscillation, then the amount of flux threading the disk remains constant during the subsequent oscillations, although the orientation distribution of the flux profile undergoes spectacular periodic variations. The analysis shows that dψ/dx = ±k dB/dx describes the orientation of the sheets of flux lines with respect to H0 with distance from the flat surfaces. dB/dx is the critical gradient of flux density and k(T) is the shearing parameter of the flux lattice for the sample. The surface step, ignored in the previous work, is introduced in the model using simple approximations.</abstract><cop>United States</cop><doi>10.1063/1.330613</doi><tpages>18</tpages></addata></record>
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1089-7550
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subjects 656102 - Solid State Physics- Superconductivity- Acoustic, Electronic, Magnetic, Optical, & Thermal Phenomena- (-1987)
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONFIGURATION
DATA
ELEMENTS
ENERGY LOSSES
FLUX DENSITY
HYSTERESIS
INFORMATION
LOSSES
MAGNETIC DISKS
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIC PROPERTIES
MAGNETIC STORAGE DEVICES
MATHEMATICAL MODELS
MEMORY DEVICES
METALS
MONITORING
NIOBIUM
NUMERICAL DATA
OSCILLATIONS
PHYSICAL PROPERTIES
REFRACTORY METALS
SHEAR
SUPERCONDUCTORS
TEMPERATURE GRADIENTS
THEORETICAL DATA
TRANSITION ELEMENTS
TYPE-II SUPERCONDUCTORS
VARIATIONS
title Hysteresis losses and magnetic phenomena in oscillating disks of type II superconductors
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