Magnetization Processes

Vlasko-Vlasov, Vitalii; Indenbom, M. V.; Polyanskii, A.A.

doi:10.1007/978-3-642-78137-7_6

Cited by 10 publications

(6 citation statements)

References 98 publications

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“…The strongly non-monotonic low-field dependence of the magnetization observed at 4.5 K is not due to matching effects but is caused by flux avalanches. This behavior is frequently observed in high-pinning superconductors [20] and has been confirmed directly using magneto-optical imaging [21].…”

supporting

confidence: 69%

Vortex pinning in Nb films patterned with nano-scale hole-arrays

Welp

Xiao

Jiang

et al. 2003

Physica B: Condensed Matter

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supporting

confidence: 69%

Vortex pinning in Nb films patterned with nano-scale hole-arrays

Welp

Xiao

Jiang

et al. 2003

Physica B: Condensed Matter

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“…In addition, they should not depolarize the polarized light beam. Different experimental set-ups which were used for the investigation of HTS are described by several authors (Moser et al 1989, Indenbom et al 1990, Gotoh et al 1990, Forkl et al 1990, Belyaeva et al 1991b, Schuster et al 1991, Forkl 1993, Vlasko-Vlasov et al 1993b and for large-area magneto-optics by Kuhn et al (1999b); for details of an optical cryostat, see e.g. Greubel et al (1990).…”

Section: Experimental Set-up and Resolutionmentioning

confidence: 99%

“…The exiting flux lines cause a dark zone of reduced flux line density which spreads from the edges into the sample. On reaching the remanent state (H ex = 0, bottom row in figure 20) flux lines with opposite sign, as compared to the pinned ones, start to penetrate the sample and partly annihilate with the pinned flux lines (Szymczak et al 1990, Schuster et al 1991, 1992a, 1992b, 1992d, 1992e, Forkl et al 1991, Vlasko-Vlasov et al 1993b. The boundary between regions containing flux lines of opposite polarity is indicated by the bold line H ex = 0 in the middle plot in the bottom row in figure 20.…”

Section: Thin Films-partly Penetrated Statementioning

confidence: 99%

Magneto-optical studies of current distributions in high-T_csuperconductors

et al. 2002

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In the past few years magneto-optical flux imaging (MOI) has come to take an increasing role in the investigation and understanding of critical current densities in high-T c superconductors (HTS). This has been related to the significant progress in quantitative high-resolution magnetooptical imaging of flux distributions together with the model-independent determination of the corresponding current distributions. We review in this article the magneto-optical imaging technique and experiments on thin films, single crystals, polycrystalline bulk ceramics, tapes and melt-textured HTS materials and analyse systematically the properties determining the spatial distribution and the magnitude of the supercurrents. First of all, the current distribution is determined by the sample geometry. Due to the boundary conditions at the sample borders, the current distribution in samples of arbitrary shape splits up into domains of nearly uniform parallel current flow which are separated by current domain boundaries, where the current streamlines are sharply bent. Qualitatively, the current pattern is described by the Bean model; however, changes due to a spatially dependent electric field distribution which is induced by flux creep or flux flow have to be taken into account. For small magnetic fields, the Meissner phase coexists with pinned vortex phases and the geometry-dependent Meissner screening currents contribute to the observed current patterns. The influence of additional factors on the current domain patterns are systematically analysed: local magnetic field dependence of j c (B), current anisotropy, inhomogeneities and local transport properties of grain boundaries. We then continue to an overview of the current distribution and current-limiting factors of materials, relevant to technical applications like melt-textured samples, coated conductors and tapes. Finally, a selection of magneto-optical experiments which give direct insight into vortex pinning and depinning mechanisms are reviewed.

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“…The two crossing lattices interact to produce a complex phase diagram [107], containing spontaneous vortex stripes and intricate melting behavior for fields very close to the ab plane [108]. Advances in scanning Hall probe technology [109] and magneto-optical imaging [110] now allow these crossing lattice states to be imaged, directly illuminating these phase transitions in real space. The dynamic properties of Josephson lattices are also fascinating.…”

Section: C)mentioning

confidence: 99%