Investigation of homoepitaxial growth on bcc surfaces with STM and kinetic Monte Carlo simulation

Köhler, Ulrich; Jensen, Christer; Wolf, Claudia; Schindler, A. C.; Brendel, Lothar; Wolf, Dietrich E.

doi:10.1016/s0039-6028(00)00151-5

Cited by 24 publications

(26 citation statements)

References 7 publications

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“…At higher coverages, there is increasingly preferential growth along the ͓001 ͔ direction with an elongation of islands along this direction. This phenomenon was encountered in other bcc ͑110͒ epitaxial systems, [22][23][24] and was attributed to both anisotropic sticking probabilities 22 and the local diffusion behavior at the island edges. 24 Other factors which may contribute to the island shape are anisotropic surface diffusion due to the two fold symmetry of the bcc ͑110͒ surface 25 and stress anisotropy within the film, due to the higher cost in elastic energy required to pseudomorphically strain an Fe layer along the ͓11 0͔ direction compared to the ͓001 ͔ direction.…”

Section: A Room-temperature Growthmentioning

confidence: 80%

Morphology and strain-induced defect structure of ultrathin epitaxial Fe films on Mo(110)

et al. 2002

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Fe films in a coverage range of 0.4рр4.7 ML were deposited on a Mo͑110͒ substrate in the 300рT р700 K temperature range. It is found that growth around 300 K is mediated by the step-flow growth mechanism, in contrast with previous studies of the Fe/Mo͑110͒ and Fe/W͑110͒ systems, where growth at 300 K was mediated by two-dimensional island nucleation and coalescence. This difference is attributed to the slightly higher substrate temperature ͑between 300 and 345 K͒ during deposition. A transition from layer-bylayer to Stranski-Krastanov growth is observed in films grown in the 300рTр345 K range at around a 1.8 ML coverage. Strain-relieving dislocation defects appear along the ͓001 ͔ direction in the second Fe layer and develop with increasing film thickness into a dislocation network at around a 2.4 ML coverage. The dislocation defects in the second Fe layer act as preferential nucleation sites for third layer islands. At elevated temperatures (495рTр700 K), the first and second Fe layers are formed by the step-flow growth mechanism. Subsequent coverages are characterized by the formation of distinctive wedge-shaped islands supported on an Fe monolayer. A two-dimensional dislocation network is formed in the fourth Fe layer of these islands, from an array of closely-spaced dislocation lines in the third layer. Similar to the Fe/W͑110͒ system, the magnetic properties of these films are expected to vary significantly on the nanometer scale and they are therefore potential candidates for spin-polarized scanning tunneling microscopy studies.

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Section: A Room-temperature Growthmentioning

confidence: 80%

Morphology and strain-induced defect structure of ultrathin epitaxial Fe films on Mo(110)

et al. 2002

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“…For example, Fe on Fe(110) [12,13], Fe on W(110) or Mo(110) [14], and Cu on W(110) [15] have been studied. Modeling and understanding of growth on this anisotropic surface is still very limited.…”

Section: Introductionmentioning

confidence: 99%

Multiscale modeling of submonolayer growth for Fe/Mo (110)

Mašín

Kotrla

et al. 2013

Eur. Phys. J. B

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Abstract. We use a multiscale approach to study a lattice-gas model of submonolayer growth of Fe/Mo(110) by Molecular Beam Epitaxy. To begin with, we construct a two-dimensional lattice-gas model of the Fe/Mo(110) system based on first-principles calculations of the monomer diffusion barrier and adatom-adatom interactions. The model is investigated by equilibrium Monte Carlo (MC) simulations to compute the diffusion coefficients of Fe islands of different sizes. These quantities are then used as input to the coarse-grained Kinetic Rate Equation (KRE) approach, which provides time evolution of the island size distributions for a system undergoing diffusion driven aggregation within the 2D submonolayer regime. We calculate these distributions at temperatures T = 500 K and 1000 K using the KRE method. We also employ direct kinetic MC simulations of our model to study island growth at T = 500 K, and find good agreement with the KRE results, which validates our multi-scale approach.

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“…The existence of a stationary angle was postulated in Ref. 18 , however the analysis concluded to facets of type 310 with θ ∼ 26.57…”

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confidence: 99%

“…The second step consists of the preparation of a nonmagnetic template. It was inspired by reports of the kinetic uniaxial roughening of films of the bcc elements Fe(110) 17 and W(110) 18 during homoepitaxy at moderate temperature, explained by anisotropic diffusion along the steps and the occurrence of an Ehrlich-Schwoebel barrier . FIG.…”

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confidence: 99%

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Kinetic self-organization of trenched templates for the fabrication of versatile ferromagnetic nanowires

Borca

Fruchart

David

et al. 2007

Applied Physics Letters

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We have self-organized versatile magnetic nanowires, i.e. with variable period and adjustable magnetic anisotropy energy (MAE). First, using the kinetic roughening of W(110) uniaxial templates of trenches were grown on commercial Sapphire wafers. Unlike most templates used for self-organization, those have a variable period, 4-12 nm are demonstrated here. Fe deposition then results in the formation of wires in the trenches. The magnitude of MAE could be engineered up or down by changing the capping-or underlayer, in turn affecting the mean superparamagnetic temperature, raised to 175 K so far.The bottom-up approach is promising for the fabrication of nanostructures at moderate cost, with better resolution and less microscopic defects than with lithography. In epitaxial self-organization (SO) the building blocks are atoms that aggregate to each other during growth, a process that can be engineered to fabricate wires and dots with lateral dimensions from the micron size 1 down to the atomic size 2,3,4 . The interest of SO for fundamental research is often the narrow size dispersion 5 , so that macroscopic measurements reveal the properties of one single nanostructure. Issues like the increase of orbital momentum and magnetic anisotropy energy (MAE) at atomic edges or kinks have been addressed 2,3,5 . Concerning applications it is sometimes argued that SO arrays could be used by addressing single nanostructures one by one, to store one bit of information for example. A more realistic view is the use of the array as a material with specific properties arising from the nanoscale. This is the case of semiconductor quantum dots with lasing properties 6 .Do magnetic SO systems meet the requirements of applied materials? A prerequisite is that some versatility of geometrical as well as physical properties is achieved, like tuning the magnitude of the MAE. We focus here on the fabrication and properties of wires, which lie at the background of the fast-developing field of spin electronics making use of the propagation of domain walls in wires for storage or logics devices 7,8,9 .SO magnetic wires are often achieved by stepdecoration of vicinal surfaces 10,11,12 . This approach is not versatile as a new crystal has to be prepared with a specific miscut whenever the period needs to be changed. Templates resulting from kinetic effects are potentially more versatile as the period can be changed with processing parameters, like temperature. This has been explored using ion etching under grazing incidence to create ripples on surfaces, independently of crystalline directions 14 . However a significant control of the period has not been demonstrated so far. Here we explore a new approach, * Olivier.Fruchart@grenoble.cnrs.fr based on the growth of body-centered-cubic (110) materials on nominally-flat Saphir yielding parallel trenches with an adjustable period, which we then use to grow magnetic nanowires. We could tune the magnitude of the MAE of the wires using suitably-chosen capping layers or underlayers. The use of commercial...

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Investigation of homoepitaxial growth on bcc surfaces with STM and kinetic Monte Carlo simulation

Cited by 24 publications

References 7 publications

Morphology and strain-induced defect structure of ultrathin epitaxial Fe films on Mo(110)

Morphology and strain-induced defect structure of ultrathin epitaxial Fe films on Mo(110)

Multiscale modeling of submonolayer growth for Fe/Mo (110)

Kinetic self-organization of trenched templates for the fabrication of versatile ferromagnetic nanowires

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