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4. Remarkable progress in fabricating RE123 coated conductors by IBAD/PLD technique at Fujikura

Author

T. Hayashida, Yasuhiro Iijima, H. Kutami, Shinji Fujita, M. Igarashi, N. Nakamura, Kazuomi Kakimoto, Y. Sutoh, Katsuhiro Morita, T. Saitoh, C. Tashita, Y. Hanada, and S. Hanyu

Subjects
History, Materials science, Nanotechnology, Electrical conductor, Throughput (business), Deposition (law), Ion source, Computer Science Applications, Education, Production rate
Abstract

Increase of production rate and improvement of quality for RE123 coated conductors have been tried. In-plane texturing of MgO was attempted by the IBAD system with the world largest ion source. As a result of optimizing condition in large deposition area, the dramatically high throughput of 1000 m / h was realized to obtain the IBAD-MgO with Δ 600 A except some locations was obtained at the throughput of 15 m / h. In addition to the speed-up, the very high Ic of 1040 A was also achieved by the hot-wall heating PLD system. more...

Published
2010
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5. Fabrication of km-length IBAD-MgO substrates at a production rate of km h−1

Author

T. Saitoh, Kazuomi Kakimoto, M. Igarashi, Katsuhiro Morita, H. Kutami, Yasuhiro Iijima, Y. Sutoh, C. Tashita, S. Hanyu, T. Hayashida, and Y. Hanada

Subjects
Materials science, Fabrication, business.industry, Metals and Alloys, Condensed Matter Physics, Ion source, Transmission electron microscopy, Materials Chemistry, Ceramics and Composites, Optoelectronics, Critical current, Texture (crystalline), Electrical and Electronic Engineering, business, Current density, Deposition (law), Production rate
Abstract

We have studied the ion-beam-assisted deposition (IBAD)-MgO process using a large IBAD system with a large ion source. Using the large IBAD system, we successfully fabricated a long-length IBAD-MgO tape (1 km) at a production rate of 1 km h−1. We have also studied a process to deposit CeO2 films directly on IBAD-MgO tapes. It is revealed that the CeO2 film is fully textured at about 100 nm. GdBa2Cu3O7−x (GdBCO) film was fabricated on a 180 m-long CeO2 /IBAD-MgO film. Its critical current (Ic) and current density (Jc) were over 300 A and 3 MA cm−2 at 77 K, self-field. more...

Published
2009
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6. High-speed deposition of high-quality RE123 films by a PLD system with hot-wall heating

Author

Kazuomi Kakimoto, Y. Hanada, Katsuhiro Morita, Yasuhiro Iijima, M. Igarashi, T. Saitoh, Y. Sutoh, C. Tashita, H. Kutami, T. Hayashida, and S. Hanyu

Subjects
Yield (engineering), Materials science, business.industry, Metals and Alloys, Analytical chemistry, Condensed Matter Physics, Evaporation (deposition), Pulsed laser deposition, Optics, Heating system, Quality (physics), Materials Chemistry, Ceramics and Composites, Laser power scaling, Electrical and Electronic Engineering, business, Electrical conductor, Deposition (law)
Abstract

We have studied the use of a hot-wall heating system for producing GdBa2Cu3O7?X (Gd123) films with large critical current (Ic), stably, at high speed, by a pulsed laser deposition (PLD) method. We achieved a material yield from the PLD system with hot-wall heating of about 50% through optimization of the evaporation conditions. With the PLD system, we were able to fabricate a Gd123 film about 20?cm long with a high Ic of 997?A (77?K, self-field) at about 6??m thickness. The maximum Ic that we achieved for a Gd123 film about 2?cm long was 1040?A (77?K, self-field) at about 6? ?m thickness. Furthermore, we were able to form a Gd123 film about 1? ?m thick and 20?cm long with an Ic of 352?A (77?K, self-field) at a high speed of 60? m?h?1 using high laser power. For the production of long conductors coated with RE123 (REBa2Cu3O7?X, where RE stands for rare earth) using hot-wall heating, it was found that RE123 coated conductors over 100?m long with Ic of over 200?A had uniform Ic distributions with ? 2% variations in the direction of the length. more...

Published
2009
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7. Fabrication of km-length IBAD-MgO substrates at a production rate of km h?1.

Author

Hanyu, S, Tashita, C, Hanada, Y, Hayashida, T, Morita, K, Sutoh, Y, Igarashi, M, Kakimoto, K, Kutami, H, Iijima, Y, and Saitoh, T

Subjects
THIN films, MAGNESIUM oxide, MICROFABRICATION, ION bombardment, CERIUM oxides, GADOLINIUM, MATERIALS texture, CRITICAL currents
Abstract

We have studied the ion-beam-assisted deposition (IBAD)-MgO process using a large IBAD system with a large ion source. Using the large IBAD system, we successfully fabricated a long-length IBAD-MgO tape (1 km) at a production rate of 1 km h[?]1. We have also studied a process to deposit CeO2 films directly on IBAD-MgO tapes. It is revealed that the CeO2 film is fully textured at about 100 nm. GdBa2Cu3O7[?]x (GdBCO) film was fabricated on a 180 m-long CeO2 /IBAD-MgO film. Its critical current (Ic) and current density (Jc) were over 300 A and 3 MA cm[?]2 at 77 K, self-field. [ABSTRACT FROM AUTHOR] more...

Published
2010
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8. High-speed deposition of high-quality RE123 films by a PLD system with hot-wall heating.

Author

Kakimoto, K, Igarashi, M, Hanada, Y, Hayashida, T, Tashita, C, Morita, K, Hanyu, S, Sutoh, Y, Kutami, H, Iijima, Y, and Saitoh, T

Subjects
THIN films, PULSED laser deposition, CRITICAL currents, HEATING, EVAPORATION (Chemistry), GADOLINIUM, SUPERCONDUCTORS
Abstract

We have studied the use of a hot-wall heating system for producing GdBa2Cu3O7[?]X (Gd123) films with large critical current (Ic), stably, at high speed, by a pulsed laser deposition (PLD) method. We achieved a material yield from the PLD system with hot-wall heating of about 50% through optimization of the evaporation conditions. With the PLD system, we were able to fabricate a Gd123 film about 20 cm long with a high Ic of 997 A (77 K, self-field) at about 6 um thickness. The maximum Ic that we achieved for a Gd123 film about 2 cm long was 1040 A (77 K, self-field) at about 6 um thickness. Furthermore, we were able to form a Gd123 film about 1 um thick and 20 cm long with an Ic of 352 A (77 K, self-field) at a high speed of 60 m h[?]1 using high laser power. For the production of long conductors coated with RE123 (REBa2Cu3O7[?]X, where RE stands for rare earth) using hot-wall heating, it was found that RE123 coated conductors over 100 m long with Ic of over 200 A had uniform Ic distributions with +- 2% variations in the direction of the length. [ABSTRACT FROM AUTHOR] more...

Published
2010
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