Flux pinning property of artificial pinning center introduced by microfabrication

Harada, Naoyuki; Yamada, Hiroshi; Sugai, K.; Munechika, I.; Tsuda, Makoto; Hamajima, T.

doi:10.1016/s0921-4534(03)01181-x

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…For research on vortex dynamics, high-energy heavy ion irradiations to YBCO single crystals were studied in order to form columnar defects or tracks [22]. Moreover, there was research in which the pinning centers were introduced to YBCO films using nanolithography [48,49]. Since these methods are top-down and high-cost techniques, they are not practicable for making long-length superconducting wires.…”

Section: Early Study Of Apcsmentioning

confidence: 99%

Artificial pinning center technology to enhance vortex pinning in YBCO coated conductors

Matsumoto

Mele

2009

Supercond. Sci. Technol.

317

187

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Crystalline defects on the nano-scale, which are called artificial pinning centers (APCs), were successfully introduced into high-temperature superconductors (HTS) by nanotechnology, in order to strongly pin the quantized vortices. The critical current densities, Jc, of the HTS films were dramatically improved by APCs. It is possible to form APCs in high-quality epitaxial films, keeping the desired dimensionality, volume fraction, spatial distribution and so on. The in-field Jc of HTS films at 77 K was improved by one order of magnitude compared with previous values using APCs. This technology can be applied to the coated conductor technology in progress, and a high Jc has already been reported. A current outline of the research is described in this review.

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Section: Early Study Of Apcsmentioning

confidence: 99%

Artificial pinning center technology to enhance vortex pinning in YBCO coated conductors

Matsumoto

Mele

2009

Supercond. Sci. Technol.

317

187

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“…Alternative approaches to control local critical current and the magnetic flux pinning may be the creation of artificial structures in which the size of defects is in the range of several micrometers [9]. From the point of view of the vortex size, the effect of large defects on the magnetic and transport characteristics of superconductors was investigated in Nb [5,10], NbTi [6], Pt [11] and in HTS films [12,13]. To obtain an array of artificial defects after the fabrication process, ion irradiation or lithography followed by ion etching are the methods used [9,[12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Influence of ultrashort laser drilling on magnetic and transport characteristics of HTS tapes

Покровский

Mavritskii

Егоров

et al. 2019

Supercond. Sci. Technol.

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We investigated the magnetic and transport characteristics of second generation high-temperature superconducting (HTS) tapes with an ordered array of antidots. We have performed modification of HTS GdBa2Cu3O7−δ industrial tape produced by SuperOx (Russia) using femtosecond laser exposure. We have created a local lattice of defects with the period 50 μm and the size of every hole up to 1 μm. We studied the dependence of the critical current on magnetic field and the angular dependence of the critical current. The influence of the array of artificial defects on the pinning force was shown in a wide range of magnetic fields. Transport and magnetization measurements reveal that these modifications of HTS tapes increases the trapped magnetic field and the critical current. The local increase in the critical current reaches 49%. These enhancements of the critical current have been observed in the intermediate angles. The proposed method of antidot arrays by laser drilling can be used for local modification of HTS tapes, and can improve the current-carrying characteristics of industrial tapes.

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“…In this study, therefore, we chose a groove pattern instead of an antidot pattern for generating the asymmetric potential because the former can be easily fabricated by conventional photolithography and was expected to be more effective for the generation of the asymmetric pinning potential. 13) Several methods can be used to observe the magnetic flux distribution caused by the anisotropic motion of vortices. Lorentz microscopy facilitates real-time observation of individual vortices as reported by Togawa et al 12) Other methods that use a scanning probe such as a scanning superconducting quantum interference device (SQUID) 14) and a scanning micro-Hall probe 15) also allow us to measure the magnetic flux distribution.…”

Section: Introductionmentioning

confidence: 99%

Magneto-Optical Observation of Anisotropic Critical Current Density in Nb Films with Artificial Asymmetric Pinning Potential

He¹,

Harada²,

Ishibashi

et al. 2009

jjap

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Flux pinning property of artificial pinning center introduced by microfabrication

Cited by 6 publications

References 16 publications

Artificial pinning center technology to enhance vortex pinning in YBCO coated conductors

Artificial pinning center technology to enhance vortex pinning in YBCO coated conductors

Influence of ultrashort laser drilling on magnetic and transport characteristics of HTS tapes

Magneto-Optical Observation of Anisotropic Critical Current Density in Nb Films with Artificial Asymmetric Pinning Potential

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