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Generating and measuring the anisotropic elastic behaviour of Co thin films with oriented surface nano-strings on micro-cantilevers.

Madurga V, Vergara J, Favieres C - Nanoscale Res Lett (2011)

Bottom Line: The anisotropic elastic behaviour of these Co films was determined by measuring the changes that took place in the resonant frequency of each micro-cantilever after this process of creating differently oriented plasma coatings had been completed.This differential procedure allowed us to determine the difference between the Young's modulus of the different films based on the different direction of the nano-strings.This difference was determined to be, at least, the 20% of the Young's modulus of the bulk Co.PACS: 62.25.-g; 81.16.Rf; 68.60.Bs; 81.15.Fg; 68.37.Ef; 85.85.+j.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory of Magnetism, Department of Physics, Public University of Navarre, Campus Arrosadía s/n, Pamplona 31006, Spain. vmadurga@unavarra.es.

ABSTRACT
In this research, the elastic behaviour of two Co thin films simultaneously deposited in an off-normal angle method was studied. Towards this end, two Si micro-cantilevers were simultaneously coated using pulsed laser deposition at an oblique angle, creating a Co nano-string surface morphology with a predetermined orientation. The selected position of each micro-cantilever during the coating process created longitudinal or transverse nano-strings. The anisotropic elastic behaviour of these Co films was determined by measuring the changes that took place in the resonant frequency of each micro-cantilever after this process of creating differently oriented plasma coatings had been completed. This differential procedure allowed us to determine the difference between the Young's modulus of the different films based on the different direction of the nano-strings. This difference was determined to be, at least, the 20% of the Young's modulus of the bulk Co.PACS: 62.25.-g; 81.16.Rf; 68.60.Bs; 81.15.Fg; 68.37.Ef; 85.85.+j.

No MeSH data available.


Related in: MedlinePlus

Resonant frequencies of two simultaneously Co coated MCLs: anisotropic elasticity of the films. (a) (Top) Resonant frequencies for the PA-MCL: νo representing the resonant frequency before the coating process and ν(CPA-MCL) representing the resonant frequency after the Co coating process with deposition time t = 4 min. ν2(CPA-MCL)/νo2 = 0.9778. (Bottom) Resonant frequencies for the simultaneously coated PE-MCL: νo representing the resonant frequency prior to the coating process and ν(CPE-MCL) representing the resonant frequency after the coating process; ν2(CPE-MCL)/νo2 = 0.9864. (b) Resonant frequencies of the two simultaneously coated MCLs coated consecutively for 4 min: that is, for a total deposition time of 8 min. ν2(CPA-MCL)/νo2 = 0.9532 and ν2(CPE-MCL)/νo2 = 0.9768. Note the significant difference between the PA-MCL and PE-MCL ratios for the two cases and the difference between these results and those displayed in Figure 2.
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Figure 4: Resonant frequencies of two simultaneously Co coated MCLs: anisotropic elasticity of the films. (a) (Top) Resonant frequencies for the PA-MCL: νo representing the resonant frequency before the coating process and ν(CPA-MCL) representing the resonant frequency after the Co coating process with deposition time t = 4 min. ν2(CPA-MCL)/νo2 = 0.9778. (Bottom) Resonant frequencies for the simultaneously coated PE-MCL: νo representing the resonant frequency prior to the coating process and ν(CPE-MCL) representing the resonant frequency after the coating process; ν2(CPE-MCL)/νo2 = 0.9864. (b) Resonant frequencies of the two simultaneously coated MCLs coated consecutively for 4 min: that is, for a total deposition time of 8 min. ν2(CPA-MCL)/νo2 = 0.9532 and ν2(CPE-MCL)/νo2 = 0.9768. Note the significant difference between the PA-MCL and PE-MCL ratios for the two cases and the difference between these results and those displayed in Figure 2.

Mentions: The top of Figure 4a shows the resonant frequencies of the PA-MCL: νo, before the coating process and ν(CPA-MCL) after the coating process for a deposition time t = 4 min. For this coated PA-MCL, the ratio ν2(CPA-MCL)/νo2 is 0.9778. The PE-MCL, simultaneously coated with the PA-MCL, also exhibited a shift in its resonant frequency such that ν2(CPE-MCL)/νo2 = 0.9864, as shown on the bottom of Figure 4a. Unlike the two Au-coated MCLs (for which the two ratios were equal: 0.8965 and 0.8967), these two simultaneously Co-coated MCLs exhibited different mechanical behaviour depending on the position of the cantilever during the coating process; when the MCL was parallel to the cone generatrix, the PA-MCL, the ratio was 0.9778, and when the MCL was perpendicular to the cone generatrix, the PE-MCL, the ratio was 0.9864. This effect remained when the deposition time increased. Figure 4b shows the results when the two simultaneously coated MCLs were consecutively coated for other 4 min; that is, for a total deposition time of 8 min. Having demonstrated that the amount of material deposited onto each MCL was equal, we can remark that the spring constant of each Co-coated PA- or PE-MCL changed according to the longitudinal or transverse orientation of the film's nano-strings.


Generating and measuring the anisotropic elastic behaviour of Co thin films with oriented surface nano-strings on micro-cantilevers.

Madurga V, Vergara J, Favieres C - Nanoscale Res Lett (2011)

Resonant frequencies of two simultaneously Co coated MCLs: anisotropic elasticity of the films. (a) (Top) Resonant frequencies for the PA-MCL: νo representing the resonant frequency before the coating process and ν(CPA-MCL) representing the resonant frequency after the Co coating process with deposition time t = 4 min. ν2(CPA-MCL)/νo2 = 0.9778. (Bottom) Resonant frequencies for the simultaneously coated PE-MCL: νo representing the resonant frequency prior to the coating process and ν(CPE-MCL) representing the resonant frequency after the coating process; ν2(CPE-MCL)/νo2 = 0.9864. (b) Resonant frequencies of the two simultaneously coated MCLs coated consecutively for 4 min: that is, for a total deposition time of 8 min. ν2(CPA-MCL)/νo2 = 0.9532 and ν2(CPE-MCL)/νo2 = 0.9768. Note the significant difference between the PA-MCL and PE-MCL ratios for the two cases and the difference between these results and those displayed in Figure 2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211413&req=5

Figure 4: Resonant frequencies of two simultaneously Co coated MCLs: anisotropic elasticity of the films. (a) (Top) Resonant frequencies for the PA-MCL: νo representing the resonant frequency before the coating process and ν(CPA-MCL) representing the resonant frequency after the Co coating process with deposition time t = 4 min. ν2(CPA-MCL)/νo2 = 0.9778. (Bottom) Resonant frequencies for the simultaneously coated PE-MCL: νo representing the resonant frequency prior to the coating process and ν(CPE-MCL) representing the resonant frequency after the coating process; ν2(CPE-MCL)/νo2 = 0.9864. (b) Resonant frequencies of the two simultaneously coated MCLs coated consecutively for 4 min: that is, for a total deposition time of 8 min. ν2(CPA-MCL)/νo2 = 0.9532 and ν2(CPE-MCL)/νo2 = 0.9768. Note the significant difference between the PA-MCL and PE-MCL ratios for the two cases and the difference between these results and those displayed in Figure 2.
Mentions: The top of Figure 4a shows the resonant frequencies of the PA-MCL: νo, before the coating process and ν(CPA-MCL) after the coating process for a deposition time t = 4 min. For this coated PA-MCL, the ratio ν2(CPA-MCL)/νo2 is 0.9778. The PE-MCL, simultaneously coated with the PA-MCL, also exhibited a shift in its resonant frequency such that ν2(CPE-MCL)/νo2 = 0.9864, as shown on the bottom of Figure 4a. Unlike the two Au-coated MCLs (for which the two ratios were equal: 0.8965 and 0.8967), these two simultaneously Co-coated MCLs exhibited different mechanical behaviour depending on the position of the cantilever during the coating process; when the MCL was parallel to the cone generatrix, the PA-MCL, the ratio was 0.9778, and when the MCL was perpendicular to the cone generatrix, the PE-MCL, the ratio was 0.9864. This effect remained when the deposition time increased. Figure 4b shows the results when the two simultaneously coated MCLs were consecutively coated for other 4 min; that is, for a total deposition time of 8 min. Having demonstrated that the amount of material deposited onto each MCL was equal, we can remark that the spring constant of each Co-coated PA- or PE-MCL changed according to the longitudinal or transverse orientation of the film's nano-strings.

Bottom Line: The anisotropic elastic behaviour of these Co films was determined by measuring the changes that took place in the resonant frequency of each micro-cantilever after this process of creating differently oriented plasma coatings had been completed.This differential procedure allowed us to determine the difference between the Young's modulus of the different films based on the different direction of the nano-strings.This difference was determined to be, at least, the 20% of the Young's modulus of the bulk Co.PACS: 62.25.-g; 81.16.Rf; 68.60.Bs; 81.15.Fg; 68.37.Ef; 85.85.+j.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory of Magnetism, Department of Physics, Public University of Navarre, Campus Arrosadía s/n, Pamplona 31006, Spain. vmadurga@unavarra.es.

ABSTRACT
In this research, the elastic behaviour of two Co thin films simultaneously deposited in an off-normal angle method was studied. Towards this end, two Si micro-cantilevers were simultaneously coated using pulsed laser deposition at an oblique angle, creating a Co nano-string surface morphology with a predetermined orientation. The selected position of each micro-cantilever during the coating process created longitudinal or transverse nano-strings. The anisotropic elastic behaviour of these Co films was determined by measuring the changes that took place in the resonant frequency of each micro-cantilever after this process of creating differently oriented plasma coatings had been completed. This differential procedure allowed us to determine the difference between the Young's modulus of the different films based on the different direction of the nano-strings. This difference was determined to be, at least, the 20% of the Young's modulus of the bulk Co.PACS: 62.25.-g; 81.16.Rf; 68.60.Bs; 81.15.Fg; 68.37.Ef; 85.85.+j.

No MeSH data available.


Related in: MedlinePlus