Magnetooptical investigations of large transport currents in Y-Ba-Cu-O-thin films

Marcus Kuhn; Andreas Heinrich; Bernd Schey; Wolfgang Biegel; Kai Numssen; Helmut Kinder; Bernd Stritzker

doi:10.1109/77.919738

Magnetooptical investigations of large transport currents in Y-Ba-Cu-O-thin films

Marcus Kuhn, Andreas Heinrich, Bernd Schey, Wolfgang Biegel, Kai Numssen, Helmut Kinder, Bernd Stritzker

Department of Physics

Research output: Contribution to journal › Conference article › peer-review

1 Scopus citations

Abstract

Inhomogeneities in large area YBCO-thin films can be studied in external magnetic fields with a specially designed magnetooptical apparatus. Moreover, an investigation of transport current induced magnetic fields in patterned HTS-thin films is possible as well. In the present work we studied the flux penetration of the current induced fields into YBCO-bridges of 8 × 0.7 cm² dimensions as a function of the applied currents at 77 K. For the first time transport currents up to I_tr ∼ 60 A could be investigated magnetooptically in HTS-thin films. Flux penetration starts just above a threshold value of the applied current I_tr/I_c ≥ 0.3. The influence of the bridge geometry and of inhomogeneities on flux penetration has been investigated. Flux and therefore current distributions change drastically with increasing bend-angle of the YBCO-path. A magnetic interaction between adjacent bridges with parallel and antiparallel current directions as well as a thermal interaction could be observed.

Original language	English
Pages (from-to)	3178-3181
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	11
Issue number	1 III
DOIs	https://doi.org/10.1109/77.919738
State	Published - Mar 2001
Event	2000 Applied Superconductivity Conference - Virginia Beach, VA, United States Duration: 17 Sep 2000 → 22 Sep 2000

Keywords

Current limiter
Magnetooptic effects
Superconducting films

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10.1109/77.919738

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title = "Magnetooptical investigations of large transport currents in Y-Ba-Cu-O-thin films",

abstract = "Inhomogeneities in large area YBCO-thin films can be studied in external magnetic fields with a specially designed magnetooptical apparatus. Moreover, an investigation of transport current induced magnetic fields in patterned HTS-thin films is possible as well. In the present work we studied the flux penetration of the current induced fields into YBCO-bridges of 8 × 0.7 cm2 dimensions as a function of the applied currents at 77 K. For the first time transport currents up to Itr ∼ 60 A could be investigated magnetooptically in HTS-thin films. Flux penetration starts just above a threshold value of the applied current Itr/Ic ≥ 0.3. The influence of the bridge geometry and of inhomogeneities on flux penetration has been investigated. Flux and therefore current distributions change drastically with increasing bend-angle of the YBCO-path. A magnetic interaction between adjacent bridges with parallel and antiparallel current directions as well as a thermal interaction could be observed.",

keywords = "Current limiter, Magnetooptic effects, Superconducting films",

author = "Marcus Kuhn and Andreas Heinrich and Bernd Schey and Wolfgang Biegel and Kai Numssen and Helmut Kinder and Bernd Stritzker",

year = "2001",

month = mar,

doi = "10.1109/77.919738",

language = "English",

volume = "11",

pages = "3178--3181",

journal = "IEEE Transactions on Applied Superconductivity",

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number = "1 III",

note = "2000 Applied Superconductivity Conference ; Conference date: 17-09-2000 Through 22-09-2000",

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T1 - Magnetooptical investigations of large transport currents in Y-Ba-Cu-O-thin films

AU - Kuhn, Marcus

AU - Heinrich, Andreas

AU - Schey, Bernd

AU - Biegel, Wolfgang

AU - Numssen, Kai

AU - Kinder, Helmut

AU - Stritzker, Bernd

PY - 2001/3

Y1 - 2001/3

N2 - Inhomogeneities in large area YBCO-thin films can be studied in external magnetic fields with a specially designed magnetooptical apparatus. Moreover, an investigation of transport current induced magnetic fields in patterned HTS-thin films is possible as well. In the present work we studied the flux penetration of the current induced fields into YBCO-bridges of 8 × 0.7 cm2 dimensions as a function of the applied currents at 77 K. For the first time transport currents up to Itr ∼ 60 A could be investigated magnetooptically in HTS-thin films. Flux penetration starts just above a threshold value of the applied current Itr/Ic ≥ 0.3. The influence of the bridge geometry and of inhomogeneities on flux penetration has been investigated. Flux and therefore current distributions change drastically with increasing bend-angle of the YBCO-path. A magnetic interaction between adjacent bridges with parallel and antiparallel current directions as well as a thermal interaction could be observed.

AB - Inhomogeneities in large area YBCO-thin films can be studied in external magnetic fields with a specially designed magnetooptical apparatus. Moreover, an investigation of transport current induced magnetic fields in patterned HTS-thin films is possible as well. In the present work we studied the flux penetration of the current induced fields into YBCO-bridges of 8 × 0.7 cm2 dimensions as a function of the applied currents at 77 K. For the first time transport currents up to Itr ∼ 60 A could be investigated magnetooptically in HTS-thin films. Flux penetration starts just above a threshold value of the applied current Itr/Ic ≥ 0.3. The influence of the bridge geometry and of inhomogeneities on flux penetration has been investigated. Flux and therefore current distributions change drastically with increasing bend-angle of the YBCO-path. A magnetic interaction between adjacent bridges with parallel and antiparallel current directions as well as a thermal interaction could be observed.

KW - Current limiter

KW - Magnetooptic effects

KW - Superconducting films

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U2 - 10.1109/77.919738

DO - 10.1109/77.919738

M3 - Conference article

AN - SCOPUS:0035268402

SN - 1051-8223

VL - 11

SP - 3178

EP - 3181

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

IS - 1 III

T2 - 2000 Applied Superconductivity Conference

Y2 - 17 September 2000 through 22 September 2000

ER -

Magnetooptical investigations of large transport currents in Y-Ba-Cu-O-thin films

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Keywords

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