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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

Schematic representation of the device used in the simultaneous off-normal coating of the two micro-cantilevers. (a) General view showing the plasma and the cone with the two MCLs. (b) (Left) Magnification of the cone with the MCLs: the PA-MCL is parallel to the cone generatrix, and the PE-MCL is perpendicular to the cone generatrix. Each MCL is located at one end of the diameter of a circle, which is a circular section perpendicular to the axis of the cone. Note that the two MCLs travel through the plasma in exactly the same circumference. (b) (Right) Schematic picture of the MCLs indicating the coating plasma direction and the transverse (PA-MCL) or longitudinal (PE-MCL) nano-strings generated.
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Figure 1: Schematic representation of the device used in the simultaneous off-normal coating of the two micro-cantilevers. (a) General view showing the plasma and the cone with the two MCLs. (b) (Left) Magnification of the cone with the MCLs: the PA-MCL is parallel to the cone generatrix, and the PE-MCL is perpendicular to the cone generatrix. Each MCL is located at one end of the diameter of a circle, which is a circular section perpendicular to the axis of the cone. Note that the two MCLs travel through the plasma in exactly the same circumference. (b) (Right) Schematic picture of the MCLs indicating the coating plasma direction and the transverse (PA-MCL) or longitudinal (PE-MCL) nano-strings generated.

Mentions: Si MCLs, 450 × 50 × ≈ 2 μm3 were coated with Co using PLD via an off-normal-incidence plasma procedure. A Nd:YAG laser beam (λ = 1054 nm, 20-Hz repetition rate, 240 mJ per 4.5-ns pulse, ≈12 GW, target spot area ≈12 mm2) was driven onto a pure, polished Co target located inside a chamber with a base pressure of 10-6 mbar. The target rotated at 32 rpm and angle of the laser beam from normal to the target was 45°. The MCLs were positioned at a distance of 73 mm from the target and were placed on the lateral surface of a cone with an angle of π-2θ; the axis of the cone was parallel to the direction of the plasma to allow deposition at an off-normal angle, θ, as shown in Figure 1. In this study, the plasma generated reached two MCLs at an off-normal angle of θ = 55°. The cone rotated around its axis at 73 rpm. MCL holders were designed to allow the simultaneous off-normal coating of two MCLs, one parallel (PA-MCL) and one perpendicular (PE-MCL) to the generatrix of the cone, as shown in Figure 1b. Each MCL was located at each end of the diameter of a circle, a circular section perpendicular to the cone axis. Due to the cone rotation and the position of the two MCLs, the MCLs travelled through the plasma in exactly the same circumference, which ensured that each was coated with the same amount of material.


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)

Schematic representation of the device used in the simultaneous off-normal coating of the two micro-cantilevers. (a) General view showing the plasma and the cone with the two MCLs. (b) (Left) Magnification of the cone with the MCLs: the PA-MCL is parallel to the cone generatrix, and the PE-MCL is perpendicular to the cone generatrix. Each MCL is located at one end of the diameter of a circle, which is a circular section perpendicular to the axis of the cone. Note that the two MCLs travel through the plasma in exactly the same circumference. (b) (Right) Schematic picture of the MCLs indicating the coating plasma direction and the transverse (PA-MCL) or longitudinal (PE-MCL) nano-strings generated.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: Schematic representation of the device used in the simultaneous off-normal coating of the two micro-cantilevers. (a) General view showing the plasma and the cone with the two MCLs. (b) (Left) Magnification of the cone with the MCLs: the PA-MCL is parallel to the cone generatrix, and the PE-MCL is perpendicular to the cone generatrix. Each MCL is located at one end of the diameter of a circle, which is a circular section perpendicular to the axis of the cone. Note that the two MCLs travel through the plasma in exactly the same circumference. (b) (Right) Schematic picture of the MCLs indicating the coating plasma direction and the transverse (PA-MCL) or longitudinal (PE-MCL) nano-strings generated.
Mentions: Si MCLs, 450 × 50 × ≈ 2 μm3 were coated with Co using PLD via an off-normal-incidence plasma procedure. A Nd:YAG laser beam (λ = 1054 nm, 20-Hz repetition rate, 240 mJ per 4.5-ns pulse, ≈12 GW, target spot area ≈12 mm2) was driven onto a pure, polished Co target located inside a chamber with a base pressure of 10-6 mbar. The target rotated at 32 rpm and angle of the laser beam from normal to the target was 45°. The MCLs were positioned at a distance of 73 mm from the target and were placed on the lateral surface of a cone with an angle of π-2θ; the axis of the cone was parallel to the direction of the plasma to allow deposition at an off-normal angle, θ, as shown in Figure 1. In this study, the plasma generated reached two MCLs at an off-normal angle of θ = 55°. The cone rotated around its axis at 73 rpm. MCL holders were designed to allow the simultaneous off-normal coating of two MCLs, one parallel (PA-MCL) and one perpendicular (PE-MCL) to the generatrix of the cone, as shown in Figure 1b. Each MCL was located at each end of the diameter of a circle, a circular section perpendicular to the cone axis. Due to the cone rotation and the position of the two MCLs, the MCLs travelled through the plasma in exactly the same circumference, which ensured that each was coated with the same amount of material.

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