Magnetic Flux Penetration Into Superconducting Thin Films PDF Download
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Author: Gerald Earl Peabody
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Gerald Earl Peabody
Publisher:
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Category :
Languages : en
Pages :
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Author: Robert N. Goren
Publisher:
ISBN:
Category :
Languages : en
Pages : 204
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Book Description
Patterns of magnetic flux penetration have been observed in thin superconducting films of tin, lead, and indium in perpendicular applied fields of 0.1 - 100 Oe. The flux patterns were studied by measuring the magnetic field very close to the film with a high resolution Hall probe which could be scanned in a plane parallel to the surface of the film. The observed patterns appear to contain both laminar and round normal regions. Using Landau's theory of the intermediate state as a guide, a similar model is considered in which the flux pattern consists of normal spots, rather than laminae. Within the accuracy of an approximate calculation, the free energy of both models is roughly the same in low fields, which implies that both spots and laminae can exist in the intermediate state. The results for the thicker indium samples (1.1 - 6.3 micrometers) are in good agreement with the temperature, field, and thickness dependences of either Landau's laminar model or our spot model for the intermediate state. (Author).
Author: Tetyana Shapoval
Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG
ISBN: 9783838124759
Category :
Languages : en
Pages : 116
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Local studies of vortex distribution in superconducting (SC) thin films and their pinning by natural and artificial defects were performed using low-temperature magnetic force microscopy (MFM). The depinning of vortices by the MFM tip was visualized and the local pinning force was estimated in a good agreement with global transport measurements. It was shown that the presence of an ordered array of ferromagnetic dots being in a magnetic vortex state underneath the SC film significantly influences the natural pinning landscape of the superconductor leading to commensurate pinning effects. This strong pinning exceeds the repulsive interaction between the SC vortices and allows vortex clusters to be located at each dot. For industrially applicable YBCO films the main question discussed was a correlation between vortices and artificial defects as well as vortex imaging on rough thin films. Since the surface roughness causes a severe problem to the scanning tip, a nanoscale wedge polishing technique was developed. Mounting the sample under a defined small angle results in a smooth surface and a monotonic thickness reduction of the film along the length of the sample.
Author: A. V. Narlikar
Publisher: Nova Publishers
ISBN: 9781560721826
Category : Science
Languages : en
Pages : 468
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Book Description
Visualisation of Shubnikov Phase Using the High Resolution Faraday Effect; Mechanism of microwave Absorption and Flux Distribution in High Temperature Superconductors; Field Penetration and Magnetisation of Hts; Experimental Aspects of Megnetisation Studies in Superconductors; Recent Development of the Critical State Model; Anomalous Magnetisation in Ybacuo Single Crystals; Surface Barrier and Fish Tail; Low Field Magnetic Behaviour of High Temperature Superconductors; Irreversible Part of Magnetisation Due to Flux Pinning; Irreversibility Line in High Temperature Superconductors; Non-Linear Flux Flow Regime High-Temperature Superconductors.
Author: John Robert Bruce Smithyman
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Andrew Raymond Sass
Publisher:
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Category : Strip transmission lines
Languages : en
Pages : 36
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Author:
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Category :
Languages : en
Pages :
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When a weak magnetic field is applied to a superconducting strip or disk of thickness d (of the order of the penetration depth [lambda]) much less than its width or radius, induced super-currents flow so as to prevent magnetic flux from penetrating the superconductor (except within [lambda] of the edge). A stronger field causes vortices to enter, and the profiles of the macroscopic flux density B are determined by critical-state equations describing bulk pinning. Near the sample edge, where the vortices are, the magnitude of the current density J is J[sub c]. In vortex-free regions of the sample, the magnitude of J is less than J[sub c] but is not zero. The profiles of B can be calculated analytically by assuming that J, averaged over the film thickness, is given by the difference between the values of the tangential component of B at the top and bottom surfaces of the film. This paper examines the basis for this assumption, which is equivalent to assuming that the current density is determined solely by the curvature of H, rather than by the gradient of its magnitude. It is shown that this is a good approximation for thin-film strips and disks.
Author: I. D. Skurnick
Publisher:
ISBN:
Category : Superconductivity
Languages : en
Pages : 20
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Author: R.P. Huebener
Publisher: Springer Science & Business Media
ISBN: 3662084465
Category : Technology & Engineering
Languages : en
Pages : 324
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Book Description
This second edition has been brought up to date by the inclusion of an extensive new chapter on aspects relevant to high-temperature superconductors. The new edition provides researchers, engineers and other scientists with an introduction to the field and makes useful supplementary reading for graduate students in low-temperature physics.
Author: Rudolf Huebener
Publisher: Springer Science & Business Media
ISBN: 3662023059
Category : Science
Languages : en
Pages : 272
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Book Description
The idea for this book originated from an International Conference on Mag netic Structures in Superconductors organized by John R. Clem and the author at Argonne National Laboratory (ANL) in September of 1973. Large parts of the book evolved from lectures given to graduate students at the University of TUbingen during the past three years. It is the purpose of this book to provide an introduction to the many features of magnetic flux structures in superconductors and to discuss the this field. Here, in addition to the static proper recent developments in ties of magnetic flux structures, the time-dependent phenomena represent an important subject including flux flow and the transport effects in supercon ductors. Throughout the book the emphasis is placed on the physical phenom ena and the experimental results. We do not attempt a general introduction to superconductivity. Except for a brief discussion of the Ginzburg-Landau theory, with respect to the theoretical developments we only give an outline and refer to the original papers or other reviews for the detail of the calculations. The book is intended for researchers and graduate students interested in the subject of magnetic flux structures in superconductors. It may serve as supplementary material for a graduate course on low-temperature solid state physics. During recent years technological applications of supercon ducting materials are becoming increasingly important. Here the static and dynamic behavior of magnetic flux structures playa distinguished role. The book may be helpful for people envolved in these engineering aspects of superconductivity.
