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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

Evolution of the ratio ν2(C-MCL)/νo2 with consecutive Co deposition times. (a) Evolution of the ratio ν2(C-MCL)/νo2 with a consecutive deposition time of 1.0 min. This ratio for the CPA-MCL (featuring transverse nano-strings) has a slope that is practically equal to its initial slope and is consistent with the increment in mass of the C-MCL. This slope for the coated CPE-MCL (longitudinal nano-strings) is smaller than the slope for the CPA-MCL: an increase in the value of its spring constant, ko, must have occurred because the increase in mass was the same for the two MCLs. (b) The same behaviour was observed for the other two simultaneously off-normal Co-coated micro-cantilevers with consecutive deposition times of 4.0 min.
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Figure 6: Evolution of the ratio ν2(C-MCL)/νo2 with consecutive Co deposition times. (a) Evolution of the ratio ν2(C-MCL)/νo2 with a consecutive deposition time of 1.0 min. This ratio for the CPA-MCL (featuring transverse nano-strings) has a slope that is practically equal to its initial slope and is consistent with the increment in mass of the C-MCL. This slope for the coated CPE-MCL (longitudinal nano-strings) is smaller than the slope for the CPA-MCL: an increase in the value of its spring constant, ko, must have occurred because the increase in mass was the same for the two MCLs. (b) The same behaviour was observed for the other two simultaneously off-normal Co-coated micro-cantilevers with consecutive deposition times of 4.0 min.

Mentions: At higher deposition times, when the nano-strings had begun to grow successfully, the difference between the mechanical behaviour of the simultaneously off-normal coated PA- and PE-MCLs increased, as shown in Figure 6. The changes in the ratio ν2(C-MCL)/νo2 with a Co consecutive deposition time of 1.0 min (see Figure 6a) show how this ratio for the CPA-MCL (featuring the transverse nano-strings) has a slope practically equal to its initial slope and consistent with the increase in mass of the MCL. The slope for the CPE-MCL (with longitudinal nano-strings) is lower than the slope for the CPA-MCL, and because the increase in mass was equal for both MCLs, an increase in the value of the spring constant, k0, must have occurred for the CPE-MCL. One preliminary conclusion can be made: the off-normal Co-coating process increased the spring constant of the MCL with longitudinal nano-strings, whereas for the MCL with transverse nano-strings, which was coated during the same process, only small changes of its spring constant occurred.


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)

Evolution of the ratio ν2(C-MCL)/νo2 with consecutive Co deposition times. (a) Evolution of the ratio ν2(C-MCL)/νo2 with a consecutive deposition time of 1.0 min. This ratio for the CPA-MCL (featuring transverse nano-strings) has a slope that is practically equal to its initial slope and is consistent with the increment in mass of the C-MCL. This slope for the coated CPE-MCL (longitudinal nano-strings) is smaller than the slope for the CPA-MCL: an increase in the value of its spring constant, ko, must have occurred because the increase in mass was the same for the two MCLs. (b) The same behaviour was observed for the other two simultaneously off-normal Co-coated micro-cantilevers with consecutive deposition times of 4.0 min.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 6: Evolution of the ratio ν2(C-MCL)/νo2 with consecutive Co deposition times. (a) Evolution of the ratio ν2(C-MCL)/νo2 with a consecutive deposition time of 1.0 min. This ratio for the CPA-MCL (featuring transverse nano-strings) has a slope that is practically equal to its initial slope and is consistent with the increment in mass of the C-MCL. This slope for the coated CPE-MCL (longitudinal nano-strings) is smaller than the slope for the CPA-MCL: an increase in the value of its spring constant, ko, must have occurred because the increase in mass was the same for the two MCLs. (b) The same behaviour was observed for the other two simultaneously off-normal Co-coated micro-cantilevers with consecutive deposition times of 4.0 min.
Mentions: At higher deposition times, when the nano-strings had begun to grow successfully, the difference between the mechanical behaviour of the simultaneously off-normal coated PA- and PE-MCLs increased, as shown in Figure 6. The changes in the ratio ν2(C-MCL)/νo2 with a Co consecutive deposition time of 1.0 min (see Figure 6a) show how this ratio for the CPA-MCL (featuring the transverse nano-strings) has a slope practically equal to its initial slope and consistent with the increase in mass of the MCL. The slope for the CPE-MCL (with longitudinal nano-strings) is lower than the slope for the CPA-MCL, and because the increase in mass was equal for both MCLs, an increase in the value of the spring constant, k0, must have occurred for the CPE-MCL. One preliminary conclusion can be made: the off-normal Co-coating process increased the spring constant of the MCL with longitudinal nano-strings, whereas for the MCL with transverse nano-strings, which was coated during the same process, only small changes of its spring constant occurred.

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