Microstructure and magnetooptics of silicon oxide with implanted nickel nanoparticles

Édelman, I. S.; Petrov, D. A.; Ivantsov, R. D.; Жарков, С. М.; Хайбуллин, Р. И.; Валеев, В. Ф.; Нуждин, В. И.; Степанов, А. Л.

doi:10.1134/s1063776111160035

Cited by 4 publications

(4 citation statements)

References 29 publications

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“…A comparison of the dimensional and dispersion dependences σ obtained by us and in [5] showed that they are qualitatively similar. In both cases (except for small deviations caused by the long-wave band in the dispersion σ), a decrease in σ with a decrease in the size of the nanoparticles is observed.…”

Section: Resultssupporting

confidence: 61%

“…1 shows the dispersion dependences of α 1Ni and α 2Ni of a model spherical particle, with properties of "bulk" (in macroscopic volumes) of nickel. α 1Ni and α 2Ni calculated from the formulas (5)(6)(7)(8) and the data on n and k for nickel in the macroscopic volumes contained in [18].…”

Section: Resultsmentioning

confidence: 99%

“…In addition, in order to compare the size and dispersion characteristics α obtained by the experimental-analytical method with the results given in [5], it is necessary to determine the values of the optical electric conductivity σ of the nickel nanoparticles. Optical electric conductivity of spherical particles is related to α by means of the relation:…”

Section: Specific Electric Polarizability Is Determined By Thementioning

confidence: 99%

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Optical properties of nickel nanoparticles in systems with a statistically inhomogeneous structure

Machulianskyi

2018

Mìkrosist. elektron. akust.

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The analysis and further development of the experimental-analytical approach for determining the values of the optical parameters of nanosized particles for a system with a statistically inhomogeneous structure is presented. An improved experimental-analytical method for determining the complex specific electric polarizability of nanosized particles in systems with a statistically inhomogeneous structure is based on spectrophotometric and electron-microscopic measurements on two-dimensional structures and application of analytical solution of Rosenberg's spectrophotometric equations with the consideration of analysis of particle size distribution.Experimental spectrophotometric and electron-microscopic studies of nickel islet films with weight thickness from 0.3 nm to 2.0 nm deposited by high-vacuum sputtering on quartz substrates in the range of the spectrum 0.2 ÷ 1, 1 μm are performed. Islands nickel film presented morphological microstructure in the form of monolayers isolated from each other nanoislands spherical surface nickel concentration (0.8 ÷ 2.0) • 10 12 cm -2 and an average particle diameter 2.5 ÷ 7 nm.The optical characteristics, namely, the complex specific electric polarizability, optical electric conductivity of nanosized nickel particles are determined in the spectral range 0.2 ÷ 1.1 μm with the help of the improved experimental-analytical method. A significant increase to one order of magnitude of the absolute values of complex specific electric polarizability of nickel particles with a decrease in their size and in comparison with absolute values of complex specific electric polarizability of model spheres with refractive index and absorption index of nickel in macroscopic volumes was revealed. It is established that in the spectral dependences of optical electric conductivity of nickel nanoparticles in the range 0.2 ÷ 1.1 μm there is a band that diminishing size is shifted to a high-frequency region. In this case, the value of optical electric conductivity of nickel nanoparticles monotonically decreases with a decrease in the size by 1-2 orders of magnitude. Comparison of the obtained values of optical electric conductivity of particles in the range of the considered interval with the values of optical electric conductivity of macroscopic samples of nickel in the studied range of the spectrum shows that in particles the value of optical electric conductivity is 2-3 orders of magnitude smaller than that of bulk metals. It is shown that in the nanoparticles of nickel absorption of "Drude" type in the near infrared region the spectrum is suppressed. The reason for this phenomenon may be the change of the mechanism of low-frequency electromagnetic response in nanosized metal particles in comparison with macroscopic metals.The research results are of interest for the development and optimization of nanostructured systems with the inclusion of nanosized nickel particles and functional devices based on them with given electromagnetic characteristics.Ref. 22, fig. 4.

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Section: Resultssupporting

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Section: Specific Electric Polarizability Is Determined By Thementioning

confidence: 99%

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Optical properties of nickel nanoparticles in systems with a statistically inhomogeneous structure

Machulianskyi

2018

Mìkrosist. elektron. akust.

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“…The experimental technique is described in more detail in Ref. [ 25 ]. The MCD effect was measured in the normal geometry: an external magnetic field vector and the light beam were directed normal to the films plane.…”

Section: Methodsmentioning

confidence: 99%

Particles–Matrix Bond in ZnCoO:H and ZnCoAlO:H Films: Issues of Magnetism and Spin Injection

et al. 2023

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ZnCoO:H and ZnCoAlO:H films were synthesized by radio frequency magnetron sputtering in a (1 − x)Ar + xH2 mixed atmosphere with x = 0.2–0.5. The films contain different amounts of metallic Co particles (from 7.6% and higher) ~4–7 nm in size. The magnetic and magneto-optical (MO) behavior of the films was analyzed in combination with their structural data. The samples exhibit high values of magnetization (up to 377 emu/cm3) and MO response at room temperature. Two situations are considered: (1) the film magnetism is associated only with isolated metal particles and (2) magnetism is present both in the oxide matrix and in metal inclusions. It has been established that the formation mechanism of the magnetic structure of ZnO:Co2+ is due to the spin-polarized conduction electrons of metal particles and zinc vacancies. It was also found that in the presence of two magnetic components in the films, these components are exchange-coupled. In this case, the exchange coupling generates a high spin polarization of the films. The spin-dependent transport properties of the samples have been studied. A high value of the negative magnetoresistance of the films at room temperature (~4%) was found. This behavior was explained in terms of the giant magnetoresistance model. Thus, the ZnCoO:H and ZnCoAlO:H films with high spin polarization can be considered as sources of spin injection.

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Local structure study of the Ni nanoparticles embedded in SiO2 by ion implantation

Zhang

Wang

Chen

et al. 2016

Journal of Alloys and Compounds

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Microstructure and magnetooptics of silicon oxide with implanted nickel nanoparticles

Cited by 4 publications

References 29 publications

Optical properties of nickel nanoparticles in systems with a statistically inhomogeneous structure

Optical properties of nickel nanoparticles in systems with a statistically inhomogeneous structure

Particles–Matrix Bond in ZnCoO:H and ZnCoAlO:H Films: Issues of Magnetism and Spin Injection

Local structure study of the Ni nanoparticles embedded in SiO2 by ion implantation

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