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5 Jan 1998

Volume 72, Issue 1, pp. 1-133

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Enhanced cluster mobilities on Pt(111) during film growth from the vapor phase

V. Chirita, E. P. Münger, J.-E. Sundgren, and J. E. Greene

Appl. Phys. Lett. 72, 127 (1998); http://dx.doi.org/10.1063/1.120664 (3 pages) | Cited 9 times

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We use molecular dynamics simulations to follow the dynamics of small two-dimensional Pt clusters on Pt(111) at 1000 K. While close-packed Pt7 heptamers are extremely stable structures, the addition of a single cluster vacancy or an on-top adatom immediately results in intracluster bond breaking, reconfigurations, rotations, the introduction of stacking faults, and greatly enhanced cluster diffusion rates. Mapping center-of-mass motion for total simulation times >145 ns revealed increases in cluster velocities by more than an order of magnitude with cluster migration occurring primarily by concerted motion and a novel diffusion mechanism involving double shearing of dimers/trimers. Contrary to some previous reports, edge-atom diffusion plays only a minor role. © 1998 American Institute of Physics.
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68.35.Fx Diffusion; interface formation
61.72.Nn Stacking faults and other planar or extended defects
61.46.-w Structure of nanoscale materials
61.72.J- Point defects and defect clusters
68.08.-p Liquid-solid interfaces
68.43.-h Chemisorption/physisorption: adsorbates on surfaces
68.55.-a Thin film structure and morphology

Transient photocurrents in lead zirconate titanate thin films

A. Kholkin, O. Boiarkine, and N. Setter

Appl. Phys. Lett. 72, 130 (1998); http://dx.doi.org/10.1063/1.120663 (3 pages) | Cited 27 times

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Transient photocurrents are investigated in ferroelectric lead zirconate titanate (PZT) films illuminated by laser pulses in the spectral range of 340–380 nm. At low electric fields, the photocurrent is sensitive to the ferroelectric polarization state and changes sign upon the polarization switching. At higher fields, the polarization-independent current proportional to the applied electric field is dominant. The spectral dependence of polarization-dependent current is controlled by the excitation of charge carriers over the forbidden band of PZT having a maximum near 3.5 eV. Possible mechanisms of the observed effect are discussed and the possibilities of a nondestructive read out of polarization state in the ultraviolet spectral range are demonstrated. © 1998 American Institute of Physics.
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77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.55.-g Dielectric thin films
73.50.Pz Photoconduction and photovoltaic effects
77.80.Fm Switching phenomena
77.22.Ej Polarization and depolarization
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