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6 Aug 2007

Volume 91, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 91, 063118 (2007); http://dx.doi.org/10.1063/1.2768861 (3 pages)

Douglas C. Meier, Steve Semancik, Bradley Button, Evgheni Strelcov, and Andrei Kolmakov
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Reduction of mosaic spread using iridium interlayers: A route to improved oxide heteroepitaxy on silicon

S. Gsell, M. Fischer, R. Brescia, M. Schreck, P. Huber, F. Bayer, B. Stritzker, and D. G. Schlom

Appl. Phys. Lett. 91, 061501 (2007); http://dx.doi.org/10.1063/1.2768003 (3 pages) | Cited 8 times

Online Publication Date: 6 August 2007

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Using epitaxial SrTiO3 and yttria-stabilized zirconia (YSZ) buffer layers deposited on silicon as a starting point, epitaxial iridium layers were grown by electron-beam evaporation using a two-step growth process with an extremely low initial deposition rate. The iridium layers had in-plane (twist) and out-of-plane (tilt) full widths at half maximum as narrow as 0.08° and 0.15°, respectively, up to an order of magnitude narrower than the underlying SrTiO3 and YSZ layers. SrTiO3 and ZnO films grown on the iridium showed significantly narrower twist and tilt values than without the iridium interlayer, demonstrating a route to improved oxide heteroepitaxy on silicon.
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68.55.A- Nucleation and growth
81.15.-z Methods of deposition of films and coatings; film growth and epitaxy

Mechanism of catalyst diffusion on magnesium oxide nanowire growth

Takeshi Yanagida, Kazuki Nagashima, Hidekazu Tanaka, and Tomoji Kawai

Appl. Phys. Lett. 91, 061502 (2007); http://dx.doi.org/10.1063/1.2768202 (3 pages) | Cited 23 times

Online Publication Date: 6 August 2007

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In nanowire growth using vapor-liquid-solid (VLS) mechanism, controlling catalyst diffusion has been a key issue since VLS growth is essentially no longer feasible in the absence of catalyst on the tip. Here the authors demonstrate the controllability of catalyst diffusion on MgO nanowire growth by ambient pressure and discuss the underlying physical mechanism. Drastic enhancement of oxide nanowire growth was found when increasing the ambient pressure under oxygen atmosphere, and surprisingly even under argon atmosphere. This indicates that the ambient pressure rather than the amount of ambient oxygen dominates the oxide nanowire growth via suppressing the catalyst diffusion.
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82.20.Hf Product distribution
82.30.Vy Homogeneous catalysis in solution, polymers and zeolites
68.65.-k Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties
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