Improving the thermal stability of nickel thin films on sapphire by a minor alloying addition of gold

Barda, Hagit; Rabkin, Eugen

doi:10.1016/j.apsusc.2019.04.176

Cited by 18 publications

(2 citation statements)

References 42 publications

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“…Diffusion in the liquid phase may be faster, but as a result of the melting (and in the thin layers, it occurs earlier), the film breaks into separate isolated droplets; the sizes of which are several times bigger than the film thickness. [22][23][24][25] It is clear, that in a film consisting of liquid-isolated particles, there will be no violation of the initial distribution of the substance along the concentration gradient.…”

Section: Methodsmentioning

confidence: 99%

Phase Diagram of In–Pb Alloy in Condensed Films

Дукаров

Petrushenko

Samsonik

et al. 2020

Physica Status Solidi (a)

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Two‐layer In–Pb films with a thickness from 50 to 200 nm, which are obtained by the method of sequential vacuum condensation, are used to study the phase diagram in this binary system. In–Pb films with a smooth composition change (0–100%) and annealing temperature (20–400 °C) are obtained within a single experimental cycle. The original method of variable composition and variable state is used. With this method of obtaining, the boundaries are observed on the substrate separating different regions of the film. X‐ray diffraction studies show that these areas correspond to different phase states of the sample and visualize the phase diagram of a binary system. The In–Pb phase diagram observed in the films generally corresponds to that for bulk samples. With an increase in the annealing temperature, the dispergation of the films intensifies. Below the liquidus temperature, the films consist of inhomogeneous in composition particles of irregular shape. Above the liquidus line, the films consist of homogeneous islands in the form of a spherical segment. Their size distribution is unimodal with a maximum; the position of which in a wide range does not depend on the concentration of the components.

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Section: Methodsmentioning

confidence: 99%

Phase Diagram of In–Pb Alloy in Condensed Films

Дукаров

Petrushenko

Samsonik

et al. 2020

Physica Status Solidi (a)

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show abstract

“…Moreover, the thermal energy provided to the thin films during the solid-state dewetting could lead to surface segregation effects of the bimetallic alloy [55], i.e., the enrichment of the surface in one of the components in comparison to the nominal concentration. In this context, the segregation of Au in Fe-and Ni-rich dewetted alloy is the subject of several studies [56][57][58]. In the case of FePd alloy, segregation of the Fe atoms on the surface was found, due to their higher oxide-forming tendency, compared to Pd atoms [59].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe70Pd30 Nanoparticles Obtained by the Solid-State Dewetting

Barrera

Celegato

Cialone

et al. 2021

Sensors

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Advances in nanofabrication techniques are undoubtedly needed to obtain nanostructured magnetic materials with physical and chemical properties matching the pressing and relentless technological demands of sensors. Solid-state dewetting is known to be a low-cost and “top-down” nanofabrication technique able to induce a controlled morphological transformation of a continuous thin film into an ordered nanoparticle array. Here, magnetic Fe70Pd30 thin film with 30 nm thickness is deposited by the co-sputtering technique on a monocrystalline (MgO) or amorphous (Si3N4) substrate and, subsequently, annealed to promote the dewetting process. The different substrate properties are able to tune the activation thermal energy of the dewetting process, which can be tuned by depositing on substrates with different microstructures. In this way, it is possible to tailor the final morphology of FePd nanoparticles as observed by advanced microscopy techniques (SEM and AFM). The average size and height of the nanoparticles are in the ranges 150–300 nm and 150–200 nm, respectively. Moreover, the induced spatial confinement of magnetic materials in almost-spherical nanoparticles strongly affects the magnetic properties as observed by in-plane and out-of-plane hysteresis loops. Magnetization reversal in dewetted FePd nanoparticles is mainly characterized by a rotational mechanism leading to a slower approach to saturation and smaller value of the magnetic susceptibility than the as-deposited thin film.

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Hillocks formation in the Cr-doped Ni thin films: growth mechanisms and the nano-marker experiment

Barda

Rabkin

2019

J Mater Sci

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Improving the thermal stability of nickel thin films on sapphire by a minor alloying addition of gold

Cited by 18 publications

References 42 publications

Phase Diagram of In–Pb Alloy in Condensed Films

Phase Diagram of In–Pb Alloy in Condensed Films

Effect of the Substrate Crystallinity on Morphological and Magnetic Properties of Fe70Pd30 Nanoparticles Obtained by the Solid-State Dewetting

Hillocks formation in the Cr-doped Ni thin films: growth mechanisms and the nano-marker experiment

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