AFM analysis of MgB2 films and nanostructures

Portesi, C.; Borini, Stefano; Picotto, Gian Bartolo; Monticone, E.

doi:10.1016/j.susc.2006.09.004

Cited by 10 publications

(12 citation statements)

References 11 publications

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“…The values that have been obtained are 172 μ cm, 371 μ cm and 572 μ cm respectively. These resistivity values are in agreement with values reported in our previous works [18,19] and referred to MgB 2 microstrip and nanobridges. According to Rowell [21], our MgB 2 films can be classified as magnesium diboride samples with intermediate resistivity and it has been pointed out that the resistivity values in this intermediate regime can be explained by arguments involving both high residual resistivities and reduced effective areas [21].…”

Section: Characterization Of Mgb 2 Nanostructuressupporting

confidence: 93%

“…The calculated critical current density J c0 is about 5 × 10 5 A cm −2 . This value, even if still consistent with values in the literature for MgB 2 thin film [27,28], is lower than that calculated for our thicker films [5,18,19]. On the other hand, the higher sensitivity of thinner films to deterioration during patterning has also been observed in the literature for different superconducting materials [29,30].…”

Section: Characterization Of Mgb 2 Nanostructuressupporting

confidence: 91%

“…The results obtained in the fabrication of the first MgB 2 nanostructures 100-150 nm thick have been reported and discussed elsewhere [5,18,19]. Summarizing, the critical temperature and the transition width of nanobridges were not dramatically changed because of the structuring process.…”

Section: Characterization Of Mgb 2 Nanostructuresmentioning

confidence: 71%

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Fabrication of superconducting MgB₂nanostructures

Portesi¹,

Monticone²,

Borini³

et al. 2008

J. Phys.: Condens. Matter

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Electron beam lithography has been used for the fabrication of superconducting magnesium diboride nanofilms (thickness lower than 100 nm), which were then characterized by atomic force microscopy. The analysis reported in this paper demonstrates that these nanofilms have self-affine surfaces with a fractal dimension of ∼2.25. A size-effect on the critical temperature for activating the superconductive state is discussed and fractal scaling laws are consequently proposed. Only a moderate reduction of the critical temperature is imposed by the shrinking of the investigated nanofilms with respect to their bulk counterpart, suggesting that MgB 2 nanostructures could play a fundamental role in superconductive nanocircuits.

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Section: Characterization Of Mgb 2 Nanostructuressupporting

confidence: 93%

Section: Characterization Of Mgb 2 Nanostructuressupporting

confidence: 91%

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Fabrication of superconducting MgB₂nanostructures

Portesi¹,

Monticone²,

Borini³

et al. 2008

J. Phys.: Condens. Matter

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“…Although oscillations are expected at large length scale, Yang et al demonstrated that the existence of sampling induced oscillation in HHCF even for self-affine surface . Despite these observations, HHCF was used by some to measure the average grain size. ,, Table shows the local maxima position and the ξ value extracted from the HHCF of the model surface (Figure ). Except the value of ξ which can be related to the grain size, the others local maxima cannot be clearly associated to a characteristic dimension.…”

Section: Resultsmentioning

confidence: 99%

“…19 Despite these observations, HHCF was used by some to measure the average grain size. 10,29,30 Table 1 shows the local maxima position and the ξ value extracted from the HHCF of the model surface (Figure 2). Except the value of ξ which can be related to the grain size, the others local maxima cannot be clearly associated to a characteristic dimension.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Statistical Analysis of Mounded Surfaces: Application to the Evolution of Ultrathin Gold Film Morphology with Deposition Temperature

et al. 2012

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Extracting characteristic dimensions from mounded surfaces such as grain size or intergrain lengths is usually made by statistical analysis. Different statistical functions are used in the literature to extract characteristic lengths. The main issue is that depending on the choice of the statistical function the results can be very different. In this paper, we demonstrate using a series of model mounded surfaces for which characteristic dimensions are known, that a method (namely, interfacial differential function, IDF) is the most effective method to determine the different characteristic lengths. The influence on the statistical treatment of the variation of the different characteristic lengths is then studied and confirms the ability of the IDF analysis. The IDF method was used to analyze the evolution of ultrathin gold film morphology as function of deposition temperature. This approach allows us to demonstrate that the roughness increase with deposition temperature is mainly due to a grain height increase and not to a grain coarsening phenomena as it was claimed before.

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