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

Madurga, V.; Vergara, José; Favieres, C.

doi:10.1186/1556-276x-6-325

Cited by 6 publications

(9 citation statements)

References 15 publications

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“…Study into the mechanical properties of OAD thin films and three-dimensional nanostructures such as nanohelixes and nanosprings has received continuous attention in reviews [16] and numerous works on the subject [66,[479][480][481][482][483][484][485][486]. These studies have provided very useful information regarding the elastic and mechanical properties of this type of thin films and nanostructures; knowledge that has been applied to the development of different sensor devices for the monitoring of mechanical forces and pressure.…”

Section: Pressure Sensors and Actuatorsmentioning

confidence: 98%

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Barranco

Borrás

González‐Elipe

et al. 2016

Progress in Materials Science

617

436

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a b s t r a c tThe oblique angle configuration has emerged as an invaluable tool for the deposition of nanostructured thin films. This review develops an up to date description of its principles, including the atomistic mechanisms governing film growth and nanostructuration possibilities, as well as a comprehensive description of the applications benefiting from its incorporation in actual devices. In contrast with other reviews on the subject, the electron beam assisted evaporation technique is analyzed along with other methods operating at oblique angles, including, among others, magnetron sputtering and pulsed laser or ion beam-assisted deposition techniques. To account for the existing differences between deposition in vacuum or in the presence of a plasma, mechanistic simulations are critically revised, discussing well-established paradigms such as the tangent or cosine rules, and proposing new models that explain the growth of tilted porous nanostructures. In the second part, we present an extensive description of applications wherein oblique-angle-deposited thin films are of relevance. From there, we proceed by considering the requirements of a large number of functional devices in which these films are currently being utilized (e.g., solar cells, Li batteries, electrochromic glasses, biomaterials, sensors, etc.), and subsequently describe how and why these nanostructured materials meet with these needs.

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Section: Pressure Sensors and Actuatorsmentioning

confidence: 98%

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Barranco

Borrás

González‐Elipe

et al. 2016

Progress in Materials Science

617

436

View full text Add to dashboard Cite

show abstract

“…In this work, we show for the first time the zigzag magnetic domain walls of Co thin films obtained by PLD. PLD is a versatile method for preparing an extensive range of thin films, including magnetic films [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61]. In PLD systems, the high directionality of the plasma plume results in small modifications in the trajectory and attenuation due to the high vacuum during the deposition processes.…”

Section: Introductionmentioning

confidence: 99%

Charged magnetic domain walls as observed in nanostructured thin films: dependence on both film thickness and anisotropy

Favieres

Vergara

Madurga

2013

J. Phys.: Condens. Matter

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The magnetic domain configurations of soft magnetic, nanostructured, pulsed laser-deposited Co films were investigated. Their dependence on both the thickness t (20 nm ≤ t ≤ 200 nm) and the anisotropy was studied. Charged zigzag walls, with a characteristic saw-tooth vertex angle θ, were observed. θ changed with t from θ ≈ 17° to ≈25°, presenting an intermediate sharp maximum that has not been described before. The reduced length of the zigzag walls also exhibited a peak at t ≈ 70 nm. The relationship between the total reduced length and the density energy of the magnetic wall allowed us to establish a change from a Néel-type to a Bloch-type core of the zigzag walls at this thickness, t ≈ 70 nm. We also accounted for the magnetic energy arising from the surface roughness of the thinner films after imaging the film surface morphologies. Moreover, this distinctive behaviour of the zigzag walls of these low-anisotropy films was compared to that of high-anisotropy films.

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“…The rotation symmetry axis of the cone was parallel to the plasma direction. This cone can be static or rotating with respect to this axis during deposition to increase the homogeneity of the film [ 19 , 20 , 21 , 22 , 23 , 24 ]. In addition to the obliquely deposited films, we have also deposited Co films in normal deposition geometry θ = 0° in order to highlight the difference in the physical properties between the Co films deposited in the oblique or normal geometry.…”

Section: Experimental Methodsmentioning

confidence: 99%

Structurally Oriented Nano-Sheets in Co Thin Films: Changing Their Anisotropic Physical Properties by Thermally-Induced Relaxation

et al. 2017

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We show how nanocrystalline Co films formed by separated oblique nano-sheets display anisotropy in their resistivity, magnetization process, surface nano-morphology and optical transmission. After performing a heat treatment at 270 °C, these anisotropies decrease. This loss has been monitored measuring the resistivity as a function of temperature. The resistivity measured parallel to the direction of the nano-sheets has been constant up to 270 °C, but it decreases when measured perpendicular to the nano-sheets. This suggests the existence of a structural relaxation, which produces the change of the Co nano-sheets during annealing. The changes in the nano-morphology and the local chemical composition of the films at the nanoscale after heating above 270 °C have been analysed by scanning transmission electron microscopy (STEM). Thus, an approach and coalescence of the nano-sheets have been directly visualized. The spectrum of activation energies of this structural relaxation has indicated that the coalescence of the nano-sheets has taken place between 1.2 and 1.7 eV. In addition, an increase in the size of the nano-crystals has occurred in the samples annealed at 400 °C. This study may be relevant for the application in devices working, for example, in the GHz range and to achieve the retention of the anisotropy of these films at higher temperatures.

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

Cited by 6 publications

References 15 publications

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Charged magnetic domain walls as observed in nanostructured thin films: dependence on both film thickness and anisotropy

Structurally Oriented Nano-Sheets in Co Thin Films: Changing Their Anisotropic Physical Properties by Thermally-Induced Relaxation

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