Flux avalanches triggered by AC magnetic fields in superconducting thin films

被引：7

作者：

Motta, M. ^{[1
]}

Colauto, F. ^{[1
]}

Johansen, T. H. ^{[2
,3
]}

Dinner, R. B. ^{[4
]}

Blamire, M. G. ^{[4
]}

Ataklti, G. W. ^{[5
]}

Moshchalkov, V. V. ^{[5
]}

Silhanek, A. V. ^{[5
,6
]}

Ortiz, W. A. ^{[1
,3
]}

机构：

[1] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP, Brazil

[2] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

[3] Norwegian Acad Sci & Letters, Ctr Adv Study, NO-0271 Oslo, Norway

[4] Univ Cambridge, Dept Mat Sci, Cambridge CB2 3QZ, England

[5] Katholieke Univ Leuven, INPAC Inst Nanoscale Phys & Chem, Nanoscale Superconduct & Magnetism Grp, B-3001 Louvain, Belgium

[6] Univ Liege, Dept Phys, B-4000 Sart Tilman Par Liege, Belgium

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2012年 / 479卷

基金：

英国工程与自然科学研究理事会; 巴西圣保罗研究基金会;

关键词：

Superconducting thin film; Flux avalanches; Magneto optical imaging; Antidot array; INSTABILITY; GROWTH;

D O I：

10.1016/j.physc.2011.12.030

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Flux avalanches are known to occur as a consequence of thermomagnetic instabilities. Some of their fingerprints are jumps in magnetization curves, or a paramagnetic reentrance in AC susceptibility measurements. In this work we have studied flux avalanches triggered by an AC field cycle by means of AC susceptibility and residual magnetization after an applied AC field measured as a function of an AC excitation field (h). These measurements allow comparing both results with magneto-optical imaging carried out in similar conditions. The results show a correspondence for the onset of the avalanche activity, as well as between the residual magnetic moment and the mean gray value calculated from the magneto-optical images in the remanent state. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：134 / 136

页数：3

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