Deposition of ultrathick heavy-metal alloys on rotating substrates by high-power impulse magnetron sputtering: Target erosion effects

Sputter deposition of ultrathick ( ≈ 20 μm) Au–Ta alloy coatings on sphero-cylindrical substrates is key for the fabrication of hohlraums for magnetically assisted inertial confinement fusion. Here, we study the deposition of AuTa 4 alloy coatings onto rotating substrates. We use high-power impulse...

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Veröffentlicht in:Journal of applied physics 2024-01, Vol.135 (3)
Hauptverfasser: Shin, S. J., Bae, J. H., Engwall, A. M., Bayu Aji, L. B., Baker, A. A., Taylor, G. V., Merlo, J. B., Sohngen, L. R., Moody, J. D., Kucheyev, S. O.
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Sprache:eng
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Zusammenfassung:Sputter deposition of ultrathick ( ≈ 20 μm) Au–Ta alloy coatings on sphero-cylindrical substrates is key for the fabrication of hohlraums for magnetically assisted inertial confinement fusion. Here, we study the deposition of AuTa 4 alloy coatings onto rotating substrates. We use high-power impulse magnetron sputtering (HiPIMS) in a constant peak target voltage mode. Results show that the target erosion state has a strong impact on the dominant crystallographic phase, microstructure, surface morphology, and electrical resistivity of AuTa 4 films. This is due to effects of changes in the confining magnetic field with target erosion on the HiPIMS discharge characteristics and the sputter source output. We quantify these effects via plasma diagnostics and discuss the optimization of HiPIMS deposition of ultrathick films for cases when target erosion effects dominate film properties.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0186803