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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 Au coated MCLs: isotropic elasticity of the films. (a) Resonant frequency of an MCL before coating, νo, and the corresponding frequency, ν(CPA-MCL) of the same MCL (now referred to as the CPA-MCL) after 4 min Au coating and positioned with its longitudinal direction parallel to the cone generatrix. (b) Resonant frequencies for the MCL prior to coating and the same MCL (now referred to as the CPE-MCL) after 4 min simultaneous Au coating and positioned with its longitudinal direction perpendicular to the cone generatrix. Note that the same value of the ratio ν2(C-MCL)/νo2 was measured for CPA-MCL and CPE-MCL. Evidence that the mass deposited on the PA-MCL is identical to that deposited on the PE-MCL is also shown.
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Figure 2: Resonant frequencies of two simultaneously Au coated MCLs: isotropic elasticity of the films. (a) Resonant frequency of an MCL before coating, νo, and the corresponding frequency, ν(CPA-MCL) of the same MCL (now referred to as the CPA-MCL) after 4 min Au coating and positioned with its longitudinal direction parallel to the cone generatrix. (b) Resonant frequencies for the MCL prior to coating and the same MCL (now referred to as the CPE-MCL) after 4 min simultaneous Au coating and positioned with its longitudinal direction perpendicular to the cone generatrix. Note that the same value of the ratio ν2(C-MCL)/νo2 was measured for CPA-MCL and CPE-MCL. Evidence that the mass deposited on the PA-MCL is identical to that deposited on the PE-MCL is also shown.

Mentions: Our previous studies of the surface morphology and physical properties of off-normal PLD Au thin films showed that no nano-strings, no electrical anisotropy and no optical anisotropy were generated in these samples. These results were different from those of off-normal PLD Co. Figure 2 shows the results for the two MCLs simultaneously coated with Au using deposition time td = 4 min. The resonant frequencies of the MCLs before they were coated with Au, νo, and afterwards, ν(C-MCL), are indicated in this figure. The resonant frequency of a MCL before coating satisfies the expression νo2 ~ ko/mo with ko the spring constant of the MCL and mo its mass. For the coated MCL, the C-MCL, the ratio ν2(C-MCL)/νo2 = (k(C-MCL)/m(C-MCL))/(ko/mo) will vary when k or m changes: an increase in mass will decrease this ratio, and an increase in the spring constant will increase this ratio. For the PA-MCL, Figure 2a shows the difference between its resonant frequency, νo, and its frequency after coating with its longitudinal direction parallel to the cone generatrix, frequency ν(CPA-MCL). It is apparent that resonant frequency changes after coating, and the value of ν2(CPA-MCL)/νo2 is 0.8965. Figure 2b shows the corresponding results for the PE-MCL positioned with its longitudinal direction perpendicular to the cone generatrix. The corresponding frequency ratio is ν2(CPE-MCL)/νo2 = 0.8967. The measurements indicate that this ratio is equal for the two simultaneously Au-coated MCLs; the same shift in resonant frequency was detected. These first results suggest that no mechanical anisotropy was induced in the Au off-normal coated MCLs. Also, important evidence emerged indicating that the mass deposited on the PA-MCL was identical to that deposited on the PE-MCL. This last fact confirms that our system allows differential studies for both MCLs.


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 Au coated MCLs: isotropic elasticity of the films. (a) Resonant frequency of an MCL before coating, νo, and the corresponding frequency, ν(CPA-MCL) of the same MCL (now referred to as the CPA-MCL) after 4 min Au coating and positioned with its longitudinal direction parallel to the cone generatrix. (b) Resonant frequencies for the MCL prior to coating and the same MCL (now referred to as the CPE-MCL) after 4 min simultaneous Au coating and positioned with its longitudinal direction perpendicular to the cone generatrix. Note that the same value of the ratio ν2(C-MCL)/νo2 was measured for CPA-MCL and CPE-MCL. Evidence that the mass deposited on the PA-MCL is identical to that deposited on the PE-MCL is also shown.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: Resonant frequencies of two simultaneously Au coated MCLs: isotropic elasticity of the films. (a) Resonant frequency of an MCL before coating, νo, and the corresponding frequency, ν(CPA-MCL) of the same MCL (now referred to as the CPA-MCL) after 4 min Au coating and positioned with its longitudinal direction parallel to the cone generatrix. (b) Resonant frequencies for the MCL prior to coating and the same MCL (now referred to as the CPE-MCL) after 4 min simultaneous Au coating and positioned with its longitudinal direction perpendicular to the cone generatrix. Note that the same value of the ratio ν2(C-MCL)/νo2 was measured for CPA-MCL and CPE-MCL. Evidence that the mass deposited on the PA-MCL is identical to that deposited on the PE-MCL is also shown.
Mentions: Our previous studies of the surface morphology and physical properties of off-normal PLD Au thin films showed that no nano-strings, no electrical anisotropy and no optical anisotropy were generated in these samples. These results were different from those of off-normal PLD Co. Figure 2 shows the results for the two MCLs simultaneously coated with Au using deposition time td = 4 min. The resonant frequencies of the MCLs before they were coated with Au, νo, and afterwards, ν(C-MCL), are indicated in this figure. The resonant frequency of a MCL before coating satisfies the expression νo2 ~ ko/mo with ko the spring constant of the MCL and mo its mass. For the coated MCL, the C-MCL, the ratio ν2(C-MCL)/νo2 = (k(C-MCL)/m(C-MCL))/(ko/mo) will vary when k or m changes: an increase in mass will decrease this ratio, and an increase in the spring constant will increase this ratio. For the PA-MCL, Figure 2a shows the difference between its resonant frequency, νo, and its frequency after coating with its longitudinal direction parallel to the cone generatrix, frequency ν(CPA-MCL). It is apparent that resonant frequency changes after coating, and the value of ν2(CPA-MCL)/νo2 is 0.8965. Figure 2b shows the corresponding results for the PE-MCL positioned with its longitudinal direction perpendicular to the cone generatrix. The corresponding frequency ratio is ν2(CPE-MCL)/νo2 = 0.8967. The measurements indicate that this ratio is equal for the two simultaneously Au-coated MCLs; the same shift in resonant frequency was detected. These first results suggest that no mechanical anisotropy was induced in the Au off-normal coated MCLs. Also, important evidence emerged indicating that the mass deposited on the PA-MCL was identical to that deposited on the PE-MCL. This last fact confirms that our system allows differential studies for both MCLs.

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