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Inclined Substrate Deposition by Evaporation of Magnesium Oxide for Coated Conductors

Published online by Cambridge University Press:  15 March 2011

Markus Bauer ,
Ralf Metzger ,
Robert Semerad ,
Paul Berberich  and
Helmut Kinder
Markus Bauer
Affiliation:
Technische Universität München, Physik Department, D-85747 Garching, Germany
Ralf Metzger
Affiliation:
Technische Universität München, Physik Department, D-85747 Garching, Germany
Robert Semerad
Affiliation:
Technische Universität München, Physik Department, D-85747 Garching, Germany
Paul Berberich
Affiliation:
Technische Universität München, Physik Department, D-85747 Garching, Germany
Helmut Kinder
Affiliation:
Technische Universität München, Physik Department, D-85747 Garching, Germany
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Abstract

Biaxially textured MgO buffer layers were deposited on metal substrates using “inclined substrate deposition” (ISD). The influence of the substrate inclination angle, deposition rate, and film thickness on the texture is shown. Scanning electron microscopy reveals columnar growth. We developed a growth model to explain the texturing. To test this model we have carried out 3D Monte-Carlo simulations. We find that the preferred orientation arises from mutual shadowing of the columns and directional surface diffusion due to their initial momentum.

YBa2Cu3O7 (YBCO) films deposited on the ISD buffer layers are highly textured. The ab-planes of the YBCO are tilted with respect to the surface by typically 25° towards the direction of MgO vapor incidence. Therefore, the critical current density jc is anisotropic with up to 8 × 105MA/cm2 in one direction and 4 × 105MA/cm2 in the other. For tape coating the MgO deposition direction can be chosen so that the high jc is along the tape.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 587: Symposium O – Substrate Engineering - Paving the Way to Epitaxy , 1999 , O2.2
Copyright
Copyright © Materials Research Society 2000

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References

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