Coupling of morphology to surface transport in ion-beam-irradiated surfaces: normal incidence and rotating targets

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Show simple item record Muñoz-García, Javier Cuerno, Rodolfo Cañadas Castro, Mario 2010-02-16T11:45:13Z 2010-02-16T11:45:13Z 2009-06
dc.identifier.bibliographicCitation Journal of Physics: Condensed Matter, 2009, vol. 21, n. 22, 224020
dc.identifier.issn 0953-8984 (Print)
dc.identifier.issn 1361-648X (Online)
dc.description 12 pages, 11 figures.-- PACS nrs.: 68.35.B-, 79.20.Rf.
dc.description.abstract Continuum models have proved their applicability to describe nanopatterns produced by ion-beam sputtering of amorphous or amorphizable targets at low and medium energies. Here we pursue the recently introduced 'hydrodynamic approach' in the cases of bombardment at normal incidence, or of oblique incidence onto rotating targets, known to lead to self-organized arrangements of nanodots. Our approach stresses the dynamical roles of material (defect) transport at the target surface and of local redeposition. By applying results previously derived for arbitrary angles of incidence, we derive effective evolution equations for these geometries of incidence, which are then numerically studied. Moreover, we show that within our model these equations are identical (albeit with different coefficients) in both cases, provided surface tension is isotropic in the target. We thus account for the common dynamics for both types of incidence conditions, namely formation of dots with short-range order and long-wavelength disorder, and an intermediate coarsening of dot features that improves the local order of the patterns. We provide for the first time approximate analytical predictions for the dependence of stationary dot features (amplitude and wavelength) on phenomenological parameters, that improve upon previous linear estimates. Finally, our theoretical results are discussed in terms of experimental data.
dc.description.sponsorship This work has been partially supported by MEC (Spain) through grant nos. FIS2006-12253-C06-01 and FIS2006-12253-C06-06, by CAM (Spain) through grant no. S-0505/ESP-0158 and by JCCM (Spain) through grant no. PAC-05-005.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher IOP Publishing
dc.rights © Institute of Physics
dc.subject.other [PACS] Structure of clean surfaces (and surface reconstruction)
dc.subject.other [PACS] Atomic, molecular, and ion beam impact and interactions with surfaces
dc.subject.other Condensed matter: electrical, magnetic and optical
dc.subject.other Surfaces, interfaces and thin films
dc.title Coupling of morphology to surface transport in ion-beam-irradiated surfaces: normal incidence and rotating targets
dc.type article PeerReviewed
dc.description.status Publicado
dc.subject.eciencia Matemáticas
dc.rights.accessRights openAccess
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