15 results on '"I. A. Tambasov"'
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2. Cu–Ag and Ni–Ag meshes based on cracked template as efficient transparent electromagnetic shielding coating with excellent mechanical performance
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I. V. Podshivalov, A. A. Karacharov, Ivan V. Nemtsev, I. V. Govorun, Yuri V. Fadeev, A. V. Lukyanenko, M. M. Simunin, S. V. Khartov, A. S. Voronin, T. E. Smolyarova, D. V. Karpova, and I. A. Tambasov
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Materials science ,020502 materials ,Mechanical Engineering ,Bend radius ,chemistry.chemical_element ,02 engineering and technology ,Bending ,engineering.material ,Copper ,0205 materials engineering ,Coating ,chemistry ,Mechanics of Materials ,EMI ,Electromagnetic shielding ,engineering ,General Materials Science ,Composite material ,Sheet resistance ,Template method pattern - Abstract
Nowadays, the technical advances call for efficient electromagnetic interference (EMI) shielding of transparent devices which may be subject to data theft. We developed Cu–Ag and Ni–Ag meshes on flexible PET substrate for highly efficiency transparent EMI shielding coating. Cu–Ag and Ni–Ag meshes obtained with galvanic deposition of copper and nickel on thin Ag seed mesh which was made by cracked template method. Coefficients S11, S21 and shielding efficiency (SE) were measured for Cu–Ag and Ni–Ag meshes in X-band (8–12 GHz) and K-band (18–26.5 GHz). 90 s copper deposition increase SE from 23.2 to 43.7 dB at 8 GHz with a transparency of 82.2% and a sheet resistance of 0.25 Ω/sq. The achieved maximum SE was 47.6 dB for Cu–Ag mesh with 67.8% transparency and 41.1 dB for Ni–Ag mesh with 77.8% transparency. Cu–Ag and Ni–Ag meshes have high bending and long-term stability. Minimum bend radius is lower than 100 µm. This effect allows to produce different forms of transparent shielding objects, for example, origami method. Our coatings are the leading among all literary solutions in three-dimensional coordinates: of sheet resistance–optical transmittance–cost of produced.
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- 2021
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3. METHODS TO DETERMINE CRYSTAL LATTICE PARAMETERS OF OPAL-LIKE STRUCTURES
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I. A. Tambasov, A. V. Cherepakhin, N. P. Shestakov, A. A. Ivanenko, Ivan V. Nemtsev, V. Ya. Zyryanov, and O. V. Shabanova
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chemistry.chemical_classification ,Materials science ,Dispersity ,Emulsion polymerization ,Polymer ,Crystal structure ,Evaporation (deposition) ,Inorganic Chemistry ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Materials Chemistry ,Acetone ,Physical and Theoretical Chemistry ,Methyl methacrylate ,Dispersion (chemistry) - Abstract
Series of high-quality spherical poly(methyl methacrylate) particles with a polydispersity less than 5% are prepared by chain-growth emulsifier-free controlled radical emulsion polymerization of methyl methacrylate in water. The average diameters in the series varied from 237 nm to 447 nm. The physico-chemical properties of obtained submicrospheres can be varied to make them more stable and stronger by a modified classical synthesis technology whereby 4-10 vol.% of dispersion medium is replaced by acetone. 2D and 3D photonic crystal structures, opals, are prepared from poly(methyl methacrylate) submicrospheres. The crystal structure of the opals is studied by IR spectroscopy and scanning electron microscopy. According to the spectroscopic data, the poly(methyl methacrylate) particles contain significant amounts of water whose evaporation leads to the shrinkage of the spheres. The stereoregularity of the synthesized polymer is studied, the glass-transition temperatures of obtained samples are determined.
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- 2021
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4. A Transparent Radio Frequency Shielding Coating Obtained Using a Self-Organized Template
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A. S. Voronin, Yu. V. Fadeev, I. V. Govorun, A. S. Voloshin, I. A. Tambasov, M. M. Simunin, and S. V. Khartov
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Physics and Astronomy (miscellaneous) - Published
- 2021
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5. Technological Basis of the Formation of Micromesh Transparent Electrodes by Means of a Self-Organized Template and the Study of Their Properties
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S. V. Khartov, F. S. Ivanchenko, M. M. Simunin, I. A. Tambasov, A. S. Voronin, D. V. Karpova, and Yu. V. Fadeev
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010302 applied physics ,Materials science ,Physics and Astronomy (miscellaneous) ,Basis (linear algebra) ,business.industry ,02 engineering and technology ,Substrate (electronics) ,021001 nanoscience & nanotechnology ,01 natural sciences ,Combined approach ,Cell size ,Transparency (projection) ,0103 physical sciences ,Electrode ,Optoelectronics ,0210 nano-technology ,business ,Layer (electronics) ,Sheet resistance - Abstract
This Letter presents the results of a study of the physical properties of micromesh transparent electrodes on a flexible substrate, obtained using a template in the form of silica layers subjected to controlled cracking. For the first time, a combined approach to the control of parameters of a micromesh structure (crack width and cell size) by varying the pH and the thickness of the sol layer is proposed. Using this approach, transparent electrodes with a surface resistance of 4.1 Ω/sq with a transparency of 85.7% were obtained. Micromesh electrodes are characterized by linear optical transmission in the visible and IR ranges, which opens up prospects for their use in optoelectronics.
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- 2019
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6. Angle-resolved reflection spectroscopy of high-quality PMMA opal crystal
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I. A. Tambasov, Ivan V. Nemtsev, Victor Ya. Zyryanov, and A. A. Ivanenko
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Materials science ,business.industry ,Evaporation ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Crystal ,Wavelength ,Optics ,Hardware and Architecture ,Particle-size distribution ,Meniscus ,Electrical and Electronic Engineering ,Thin film ,0210 nano-technology ,business ,Spectroscopy ,Photonic crystal - Abstract
PMMA opal crystal was prepared by a simple hybrid method, which includes sedimentation, meniscus formation and evaporation. We investigated three surfaces of this crystal by angle-resolved reflective light spectroscopy and SEM study. The angle-resolved reflective measurements were carried out in the 400–1100 nm range. We have determined the high-quality ordered surface of the crystal region. Narrow particle size distribution of the surface has been revealed. The average particle diameter obtained with SEM was nearly 361 nm. The most interesting result was that reflectivity of the surface turned out up to 98% at normal light incidence. Using a fit of dependences of the maximum reflectivity wavelength from an angle based on the Bragg–Snell law, the wavelength of maximum 0° reflectivity, the particle diameter and the fill factor have been determined. For the best surface maximum reflectivity wavelength of a 0° angle was estimated to be 869 nm. The particle diameter and fill factor were calculated as 372 nm and 0.8715, respectively. The diameter obtained by fitting is in excellent agreement with the particle diameter obtained with SEM. The reflectivity maximum is assumed to increase significantly when increasing the fill factor. We believe that using our simple approach to manufacture PMMA opal crystals will significantly increase the fabrication of high-quality photonic crystal templates and thin films.
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- 2018
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7. Thermite synthesis, structural and magnetic properties of Co-Al2O3 nanocomposite films
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A. A. Matsynin, Yu. L. Mikhlin, Liudmila E. Bykova, Mikhail N. Volochaev, G. N. Bondarenko, V. S. Zhigalov, V. G. Myagkov, and I. A. Tambasov
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010302 applied physics ,Nanocomposite ,Materials science ,Annealing (metallurgy) ,Mechanical Engineering ,Bilayer ,Metals and Alloys ,Nanoparticle ,Thermite ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Chemical engineering ,Ferromagnetism ,Mechanics of Materials ,0103 physical sciences ,Materials Chemistry ,Chemical stability ,Thin film ,Composite material ,0210 nano-technology - Abstract
We have synthesized ferromagnetic nanocomposite Co-Al 2 O 3 thin films via a thermite reaction between Al and Co 3 O 4 with layer geometry. The starting Al/Co 3 O 4 bilayers were obtained by the deposition of Al layers onto Co 3 O 4 films at room temperature and were annealed at temperatures between 50 and 700 °C at 50 °C intervals. Above ∼450 °C the Co 3 O 4 partially transformed into the CoO phase. The simultaneous solid-state reactions of Al with Co 3 O 4 and Al with CoO started above the initiation temperature T in ∼500 °C, which did not depend on the bilayer thickness. After annealing at 700 °C about 60% of the Co was reduced by the Al and the rest of the Co was contained in intermediate CoAl 2 O 4 shells, which separated the Co nanoparticles from the Al 2 O 3 matrix. Above 700 °C the reaction was complete and the final products were noninteracting Co nanoparticles with an average size of ∼40 nm enveloped by CoAl 2 O 4 shells, which embedded into a dielectric Al 2 O 3 matrix. The synthesized Co-Al 2 O 3 nanocomposite films possessed soft magnetic behavior and good chemical stability.
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- 2017
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8. Flexible film broadband absorber based on diamond-graphite mixture and polyethylene
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I. A. Tambasov, Nikolai P. Shestakov, A. A. Ivanenko, and Anastasia A. Pshenichnaia
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Materials science ,02 engineering and technology ,engineering.material ,Hot pressing ,01 natural sciences ,010309 optics ,Inorganic Chemistry ,chemistry.chemical_compound ,Optics ,0103 physical sciences ,Transmittance ,Graphite ,Electrical and Electronic Engineering ,Physical and Theoretical Chemistry ,Absorption (electromagnetic radiation) ,Spectroscopy ,Pressing ,Range (particle radiation) ,business.industry ,Organic Chemistry ,Diamond ,Polyethylene ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,chemistry ,engineering ,Optoelectronics ,0210 nano-technology ,business - Abstract
Flexible film broadband absorber based on diamond-graphite mixture and polyethylene was fabricated by hot pressing. The film thickness of the absorber was 90 μm. We have measured angular reflectivity, diffusional reflectivity and transmittance in the range 85–8000 cm −1 (117–1.25 μm) in order to determine the absorption. It was shown that room temperature pressing of mesh print with 250 μm step significantly reduces reflectivity of the absorber. The absorption was over 0.85 in the range 85–320 cm −1 (117–31.25 μm) and >0.98 in the range 320–8000 cm −1 (31.25–1.25 μm). We believe that the designed and manufactured absorber might become a promising material for optical devices where high broadband absorption and flexibility are required.
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- 2017
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9. Preparation and investigation of composite transparent electrodes of poly(3, 4-ethylenedioxythiophene) polystyrene sulfonate/single-wall carbon nanotubes
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A. V. Shiverskii, Yu. V. Fadeev, S. V. Khartov, Fedor S. Ivanchenko, Ivan V. Nemtsev, I. A. Tambasov, A. A. Matsynin, A. S. Voronin, and M. M. Simunin
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010302 applied physics ,Materials science ,Physics and Astronomy (miscellaneous) ,Composite number ,02 engineering and technology ,Carbon nanotube ,021001 nanoscience & nanotechnology ,01 natural sciences ,law.invention ,Polystyrene sulfonate ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,PEDOT:PSS ,law ,0103 physical sciences ,Polymer substrate ,0210 nano-technology ,Layer (electronics) ,Poly(3,4-ethylenedioxythiophene) ,Sheet resistance - Abstract
The preparation of composite transparent electrodes of poly(3, 4-ethylenedioxythiophene) polystyrene sulfonate/single-wall carbon nanotubes by the spray method is described. The influence of the successive treatment of each functional layer in acid media with different activities on the optical and electric film characteristics is considered. The composite with the surface resistance of 89 Ω/sq at the transparency of 85.3% (550 nm) on a polymer substrate is obtained.
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- 2017
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10. Solid state synthesis of Mn5Ge3 in Ge/Ag/Mn trilayers: Structural and magnetic studies
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V. S. Zhigalov, V. G. Myagkov, I. A. Tambasov, Mikhail N. Volochaev, G. N. Bondarenko, Liudmila E. Bykova, D. A. Velikanov, A. A. Matsynin, and Yu. L. Mikhlin
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010302 applied physics ,Chemical substance ,Diffusion barrier ,Annealing (metallurgy) ,Chemistry ,Analytical chemistry ,Nanotechnology ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Electronic, Optical and Magnetic Materials ,law.invention ,Inorganic Chemistry ,Barrier layer ,Magazine ,Ferromagnetism ,law ,Transmission electron microscopy ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,Physical and Theoretical Chemistry ,0210 nano-technology ,Science, technology and society - Abstract
The thin-film solid-state reaction between elemental Ge and Mn across chemically inert Ag layers with thicknesses of (0, 0.3, 1 and 2.2 µm) in Ge/Ag/Mn trilayers was studied for the first time. The initial samples were annealed at temperatures between 50 and 500 °C at 50 °C intervals for 1 h. The initiation temperature of the reaction for Ge/Mn (without a Ag barrier layer) was ~ 120 °C and increased slightly up to ~ 250 °C when the Ag barrier layer thickness increased up to 2.2 µm. In spite of the Ag layer, only the ferromagnetic Mn5Ge3 compound and the Nowotny phase were observed in the initial stage of the reaction after annealing at 500 °C. The cross-sectional studies show that during Mn5Ge3 formation the Ge is the sole diffusing species. The magnetic and cross-sectional transmission electron microscopy (TEM) studies show an almost complete transfer of Ge atoms from the Ge film, via a 2.2 µm Ag barrier layer, into the Mn layer. We attribute the driving force of the long-range transfer to the long-range chemical interactions between reacting Mn and Ge atoms.
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- 2017
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11. Thermite synthesis and characterization of Co–ZrO2ferromagnetic nanocomposite thin films
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Liudmila E. Bykova, V. G. Myagkov, Mikhail N. Volochaev, G. N. Bondarenko, Sergey M. Zharkov, V. S. Zhigalov, I. A. Tambasov, and A. A. Matsynin
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010302 applied physics ,Nanocomposite ,Materials science ,Annealing (metallurgy) ,Mechanical Engineering ,Bilayer ,Metals and Alloys ,Thermite ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Amorphous solid ,Tetragonal crystal system ,Chemical engineering ,Mechanics of Materials ,0103 physical sciences ,Materials Chemistry ,Composite material ,0210 nano-technology ,Superparamagnetism ,Monoclinic crystal system - Abstract
Co–ZrO 2 ferromagnetic nanocomposite thin films were successfully synthesized using a new thermite reaction between Zr and Co 3 O 4 in layer geometry. The initial Zr/Co 3 O 4 bilayers were obtained by the deposition of Zr layers onto Co 3 O 4 films at room temperature. The process of mixing at the Zr/Co 3 O 4 interface and synthesis of fine-crystalline Co and amorphous ZrO 2 phases started at a temperature above the initiation temperature T in ∼250 °С which did not depend on the bilayer thickness. For the bilayer thickness more than 300 nm high-temperature fcc-Co and cubic c-ZrO 2 (or tetragonal t-ZrO 2 ) phases were formed. For the bilayer thickness less than ∼50 nm stable low-temperature hexagonal hcp-Co and monoclinic m-ZrO 2 phases were also present in the reaction product. A partial transformation from Co 3 O 4 to CoO occurred after annealing at 300 °С. The secondary reaction between CoO and Zr started soon after Co 3 O 4 had been converted to the CoO phase. After annealing at 500 °С more than 80% of Co was reduced and the final product contained Co nanoparticles above and below the superparamagnetic critical size embedded into a dielectric ZrO 2 matrix. The synthesized Co–ZrO 2 nanocomposite films possessed soft magnetic behavior, high magnetization and good chemical stability.
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- 2016
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12. Solid state synthesis and characterization of Fe–ZrO2 ferromagnetic nanocomposite thin films
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Liudmila E. Bykova, V. G. Myagkov, I. A. Tambasov, Oleg A. Bayukov, A. A. Matsynin, Sergey M. Zharkov, V. S. Zhigalov, and G. N. Bondarenko
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Nanocomposite ,Materials science ,Annealing (metallurgy) ,Mechanical Engineering ,Metallurgy ,Metals and Alloys ,Amorphous solid ,law.invention ,Magnetization ,Tetragonal crystal system ,Ferromagnetism ,Nanocrystal ,Chemical engineering ,Mechanics of Materials ,law ,Materials Chemistry ,Crystallization - Abstract
Fe–ZrO 2 ferromagnetic nanocomposite thin films are successfully synthesized using a thermite reaction between the Zr and Fe 2 O 3 layers. The initial Zr/Fe 2 O 3 bilayers were obtained by the deposition of Zr layers on α-Fe 2 O 3 films at room temperature. The mixing at the Zr/Fe 2 O 3 interface and synthesis of α-Fe and the amorphous ZrO 2 phases start at a temperature above the initiation temperature T in ∼ 250 °C. Together with the formation of α-Fe, partial transformation from Fe 2 O 3 to Fe 3 O 4 occurs after annealing at 300 °C. The secondary reaction between Fe 3 O 4 and Zr starts soon after the Fe 2 O 3 is converted to the Fe 3 O 4 phase. The crystallization of amorphous ZrO 2 and the formation of the ZrO 2 cubic/tetragonal phase occurs above 400 °C. After annealing at 500 °C the reaction products contain (1 1 0) textured α-Fe nanocrystals with a diameter of about 34 nm embedded in an insulating c-ZrO 2 (or t-ZrO 2 ) matrix. The synthesized Fe–ZrO 2 nanocomposite films possess soft magnetic behavior, high magnetization and good chemical stability.
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- 2015
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13. Solid state synthesis and characterization of ferromagnetic nanocomposite Fe–In2O3 thin films
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Mikhail N. Volochaev, G. N. Bondarenko, V. S. Zhigalov, V. G. Myagkov, I. A. Tambasov, Liudmila E. Bykova, Oleg A. Bayukov, and Yu. L. Mikhlin
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Materials science ,Nanocomposite ,Mechanical Engineering ,Film plane ,Metals and Alloys ,Analytical chemistry ,Nanotechnology ,Microstructure ,Nanoclusters ,Ferromagnetism ,X-ray photoelectron spectroscopy ,Mechanics of Materials ,Transmission electron microscopy ,Materials Chemistry ,Thin film - Abstract
We have successfully synthesized ferromagnetic Fe–In 2 O 3 nanocomposite thin films for the first time using the thermite reaction Fe 2 O 3 + In = In 2 O 3 + Fe. The initial In/Fe 2 O 3 bilayers were obtained by the deposition of In layers on α-Fe 2 O 3 films. The reaction occurs in a self-propagating mode in a homogeneous thermal film plane field at heating rates above 20 K/s and at temperatures above initiation temperature T in ∼ 180 °С. At heating rates lower than 20 K/s the mixing of the In and Fe 2 O 3 layers occurs across the whole In/Fe 2 O 3 interface and the synthesis of the ferromagnetic α-Fe phase starts above the initiation temperature T in = 180 °С. X-ray diffraction, X-ray photoelectron spectroscopy, Mossbauer spectroscopy, transmission electron microscopy and magnetic measurements were used for phase identification and microstructure observation of the synthesized Fe–In 2 O 3 samples. The reaction products contain (1 1 0) textured α-Fe nanocrystals with a diameter around 100 nm and surrounded by an In 2 O 3 matrix. These results enable new efficient low-temperature methods for synthesizing ferromagnetic nanocomposite films containing ferromagnetic nanoclusters embedded in transparent conducting oxides.
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- 2014
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14. Synthesis of Ferromagnetic Germanides in 40Ge/60Mn Films: Magnetic and Structural Properties
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Yu. L. Mikhlin, D. A. Velikanov, V. G. Myagkov, G. N. Bondarenko, I. A. Tambasov, Gennady S. Patrin, V. S. Zhigalov, Liudmila E. Bykova, and A.A. Matsunin
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Magnetization ,Materials science ,Ferromagnetism ,Condensed matter physics ,X-ray photoelectron spectroscopy ,Spinodal decomposition ,Annealing (metallurgy) ,Phase (matter) ,Curie temperature ,General Materials Science ,Atomic ratio ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics - Abstract
Solid-state reactions between Ge and Mn films are systematically examined using X-ray diffraction, photoelectron spectroscopy and magnetic measurements. The films have a nominal atomic ratio Ge:Mn = 40:60 and are investigated at temperatures from 50 to 500 °С. It is established that after annealing at ~120 °С, the ferromagnetic Mn5Ge3 phase is the first phase to form at the 40Ge/60Mn interface. Increasing the annealing temperature to 500 °С leads to the formation of the ferromagnetic phase with a Curie temperature TC ~ 360 K and magnetization MS ~ 140-200 emu/cc at room temperature. Analysis of X-ray diffraction patterns and the photoelectron spectra suggests that the increased Curie temperature and magnetization are related to the migration of C and O atoms into the Mn5Ge3 lattice and the formation of the Nowotny phase Mn5Ge3СxOy. The initiation temperature (~120 °С) of the Mn5Ge3 phase is the same both for solid-state reactions in Ge/Mn films, as well as for phase separation in GexMn1-x diluted semiconductors. We conclude that the synthesis of the Mn5Ge3 phase is the moving force for the spinodal decomposition of the GexMn1-x diluted semiconductors.
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- 2014
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15. Room temperature magneto-transport properties of nanocomposite Fe–In2O3 thin films
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V. G. Myagkov, I. A. Tambasov, Liudmila E. Bykova, Ekaterina V Yozhikova, A. A. Matsynin, V. S. Zhigalov, and Kirill O. Gornakov
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Weak localization ,Materials science ,Nanocomposite ,Condensed matter physics ,Magnetoresistance ,Ferromagnetism ,Nanocomposite thin films ,Thermite ,Electrical and Electronic Engineering ,Thin film ,Condensed Matter Physics ,Magneto ,Electronic, Optical and Magnetic Materials - Abstract
A ferromagnetic Fe–In2O3 nanocomposite thin film has been synthesized by the thermite reaction Fe2O3+In→Fe–In2O3. Measurements of the Hall carrier concentration, Hall mobility and magnetoresistance have been conducted at room temperature. The nanocomposite Fe–In2O3 thin film had n=1.94·1020 cm−3, μ=6.45 cm2/Vs and negative magnetoresistance. The magnetoresistance for 8.8 kOe was ~−0.22%.The negative magnetoresistance was well described by the weak localization and model proposed by Khosla and Fischer.
- Published
- 2015
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