Studies on compatibility of refractory non-metallic nano-sized filler with the organic matrix

В ходе работы впервые выполнены комплексные исследования агломерационной и седиментационной устойчивости системы «нитрид алюминия – органическая среда», в которых изучено взаимодействие частиц нитрида алюминия, полученного газофазным способом, с водными и органическими средами, определены знак и заряд поверхности частиц нитрида алюминия в различных средах и разработана структурная модель поверхности частиц нитрида алюминия. По результатам исследований определены оптимальные технологические параметры технологии пропитки статоров асинхронных электродвигателей пропиточным составом на основе кремнийорганического лака наполненного AlN и изготовлена опытная партия асинхронных электродвигателей с новой изоляцией.During the first complex studies of agglomeration and sedimentation stability of the " aluminum nitride - organic medium ", which studied the interaction of the particles of aluminum nitride obtained by gas-phase process , with water and organic media , identifies the sign and the surface charge of particles of aluminum nitride in different environments and developed a structural model of the surface of the particles of aluminum nitride . According to the research , optimal process parameters impregnation technology stator induction motors impregnating composition based on AlN filled silicone varnish and experimental batch of asynchronous electric motors with new insulation.Программа развития УрФУ на 2013 год (п.2.1.1.1

Single-mode subwavelength waveguides with wire metamaterials

We study the eigenmodes of a slab of a wire metamaterial and demonstrate that such a waveguiding structure supports deep-subwavelength propagating modes exhibiting properties of a single-mode waveguide at any fixed frequency below the plasma frequency of metal wires. We compare our analytical results with the dispersion relations extracted from the experimental measurements

Broadband isotropic μ-near-zero metamaterials

Natural diamagnetism, while being a common phenomenon, is limited to permeability values close to unity. Artificial diamagnetics, to the contrary, can be engineered to provide much lower values and may even possess an effective permeability close to zero. In this letter, we provide an experimental confirmation of the possibility to obtain extremely low permeability values by manufacturing an isotropic metamaterial composed of conducting cubes. We show that the practical assembly is quite sensitive to fabrication tolerances and demonstrate that permeability of about μ=0.15 is realisable.This work was supported by the Ministry of Education and Science of Russian Federation (Project 11.G34.31.0020), Dynasty Foundation (Russia), grant of the President of Russian Federation, and by the Australian Research Council (CUDOS Centre of Excellence CE110001018)

Anomalous polarization conversion in arrays of ultrathin ferromagnetic nanowires

We study optical properties of arrays of ultrathin nanowires by means of the Brillouin scattering of light on magnons. We employ the Stokes/anti-Stokes scattering asymmetry to probe the circular polarization of a local electric field induced inside nanowires by linearly polarized light waves. We observe the anomalous polarization conversion of the opposite sign than that in a bulk medium or thick nanowires with a great enhancement of the degree of circular polarization attributed to an unconventional refraction in the nanowire medium.Comment: 5 pages, 4 figure

Broadband isotropic μ-near-zero metamaterials

Natural diamagnetism, while being a common phenomenon, is limited to permeability values close to unity. Artificial diamagnetics, to the contrary, can be engineered to provide much lower values and may even possess an effective permeability close to zero. In this letter, we provide an experimental confirmation of the possibility to obtain extremely low permeability values by manufacturing an isotropic metamaterial composed of conducting cubes. We show that the practical assembly is quite sensitive to fabrication tolerances and demonstrate that permeability of about μ = 0.15 is realisable. © 2013 AIP Publishing LLC

Microwave Spin-Pumping from an Antiferromagnet FeBO3

Recently, canted antiferromagnets offer great potential for fundamental research and applications due to their unique properties. The presence of the Dzyaloshinskii-Moriya interaction leads to the existence of a weak ferromagnetic moment at room temperature. We study both theoretically and experimentally microwave spin pumping by the quasi-ferromagnetic mode from a canted easy plane antiferromagnet with weak ferromagnetism FeBO3. The conversion of a microwave signal into the constant voltage is realized using the inverse spin Hall effect in an iron borate/heavy metal heterostructure. We use an additional bias magnetic field to selectively tune the resonance frequency of such a microwave detector over a wide range up to 43.5 GHz with potential sensitivity near 2.5 microV/W. We confirm the pure spin current nature by changing polarity of the detected via inverse spin Hall effect voltage by switching the direction of the bias magnetic field. We believe that our results will be useful for the development of highly tunable, portable and sensitive microwave antiferromagnet-based functional devices.Comment: 7 pages, 3 figures, 3 pages supplementary informatio

THE STUDY OF THORIUM AND URANIUM SORPTION BY INORGANIC HYDRATED TITANIUM AND MANGANESE OXIDES

The report presents the results of a study of thorium and uranium sorption by inorganic hydrated titanium and manganese oxides from aqueous solutions with various pH values and uranium concentrations

EFFECT OF THE GAS MEDIA AND TEMPERATURE REGIMES OF ANNEALING ON THE PHASE COMPOSITION OF IRON BORATE FeBO3

Iron borate FeBO3 crystals are annealed in neutral, oxidizing, and reducing gas media on a specially designed setup. The effect of the chemical medium and annealing modes on the surface morphology and phase composition of the samples is established.Исследования выполнены при финансовой поддержке РФФИ, проект № 19-29-12016-мк, в части разработки экспериментальной установки и получения кристаллических образцов. Рентгеновские и электронно-микроскопические измерения проведены при под-держке Министерства науки и высшего образования РФ в рамках выполнения работ по Государственному заданию ФНИЦ «Кристаллография и фотоника» с использованием оборудования ЦКП (проект RFMEFI62119X0035)

HYPERFINE INTERACTIONS IN IRON BORATE FeBO3

For the FeBO3 single crystal, the values of isomer shift, quadrupole constant and magnetic hyperfine field were determined for over a wide temperature range.Исследования выполнены при финансовой поддержке РФФИ, проект № 19-29-12016-мк, в части мёссбауэровских исследований и теоретического анализа. Рентгеновские измерения проведены при поддержке Министерства науки и высшего образования РФ в рамках выполнения работ по Государственному заданию ФНИЦ «Кристаллография и фотоника» с использованием оборудования ЦКП (проект RFMEFI62119X0035)