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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chekanova L. A., Denisova E. A., Goncharova O. A., Komogortsev S. V., Iskhakov R. S.
Заглавие : Analysis of phase composition of Co-P alloy powders using magnetometric data
Место публикации : Phys. Metals & Metallogr. - 2013. - Vol. 114. Is. 2. - P.122-128. - DOI 10.1134/S0031918X1302004X
Аннотация: A new method for the quantitative estimate of the phase composition of a multiphase ferromagnetic alloy is suggested that is based on measuring the temperature and field dependences of the magnetization. The phase composition of ultrafine Co-P powders is characterized. Phase diagrams of nonequilibrium Co-P solid solutions are constructed on particle size, i.e., the phosphorus concentration coordinates.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Komogortsev S. V., Iskhakov R. S., Kuznetsov P. A., Balaev A. D., Bondarenko G. N.
Заглавие : Approach to magnetic saturation and random magnetic anisotropy in nanocrystalline alloy Fe73.5CuNb3Sil3.5B9
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2011): Book of abstracts. - 2011. - Ст.23PO-I-19. - P.399
Примечания : Библиогр.: 1. - Support by Federal Program “Development of the Scientific Potential of Higher Education” (project no. RNP 2.1.1/11470), Federal Target Program “Research and Research-Pedagogical Personnel of Innovation Russia for 2009-2013”, Russian Foundation for Basic Research (project 11-03-00471-а) are acknowledged.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Artemiev E. M., Komalov A. S., Smyk A. A.
Заглавие : 2 regions of amorphous state in the equiatomic composition copd alloy-films
Место публикации : Fiz. Tverd. Tela. - 1983. - Vol. 25, Is. 3. - P.949-950. - ISSN 0367-3294
Примечания : Cited References: 2
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yoo E., Samardak A. Y., Jeon Y. S., Samardak A. S., Ognev A. V., Komogortsev S. V., Kim Y. K.
Заглавие : Composition-driven crystal structure transformation and magnetic properties of electrodeposited Co–W alloy nanowires
Место публикации : J. Alloys Compd. - 2020. - Vol. 843. - Ст.155902. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2020.155902
Примечания : Cited References: 48. - This study was supported by the Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-TA1703-06, and by the Russian Ministry of Science and Higher Education under the state task (0657 -2020-0013), by Act 211 of the Government of the Russian Federation (02.A03.21.0011).
Аннотация: The cobalt (Co)–tungsten (W) alloys exhibit unique combinations of mechanical and magnetic properties, biocompatibility, resistance against corrosion, wear, and high-temperature, which makes them desirable materials for various practical applications. A nanoporous template with incorporated Co–W alloy nanowires is a soft magnetic composite, whose dielectric and magnetic properties can be tuned through the host material, pore distribution and size, Co–W composition and crystal structure, and geometry of the nanowires. Here, we report the composition-dependent structural and magnetic properties of Co–W alloy nanowires embedded in alumina templates by electrodeposition. The addition of W transforms cobalt from the crystalline hexagonal-close-packed (hcp) Co to a mixed nanocrystalline/amorphous-like Co(W) solid solution with ferromagnetic behavior and composition similar to that of the weakly magnetic Co3W compound. The combination of the approach to magnetic saturation, anisotropy field distribution method, micromagnetic simulations, and first-order reversal curve diagram identification method elucidates the structure-driven magnetization reversal processes in both individual nanowires and magnetostatically coupled array as a whole.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samardak A. S., Nasirpouri F., Nadi M., Sukovatitsina E. V., Ognev A. V., Chebotkevich L. A., Komogortsev S. V.
Заглавие : Conversion of magnetic anisotropy in electrodeposited Co-Ni alloy nanowires
Коллективы : Russian Ministry of Education and Science, Far Eastern Federal University, Iranian Nanotechnology Initiative Council
Место публикации : J. Magn. Magn. Mater.: ELSEVIER SCIENCE BV, 2015. - Vol. 383. - P.94-99. - ISSN 0304, DOI 10.1010/j.jmmm.2014.10.047. - ISSN 18734766(eISSN)
Примечания : Cited References:24. - This work was supported in part by the Russian Ministry of Education and Science and Far Eastern Federal University. M.N acknowledges the student financial support of Iranian Nanotechnology Initiative Council.
Предметные рубрики: COBALT NANOWIRES
ARRAYS
Ключевые слова (''Своб.индексиров.''): coercive force--magnetic anisotropy--magnetic hysteresis--binary alloy--nanowires--alumina template--electrodeposition
Аннотация: In this paper, the influence of alternating current (ac) electrodeposition frequency and waveform is reported on chemical composition, microstructure and consequently magnetic properties of Co-Ni binary alloy nanowire arrays embedded in an alumina template. For sinusoidal and square electrodeposition waveforms the easy axis of magnetization rotates from being parallel to perpendicular orientation to nanowire long axis as the deposition frequency increases from 200 to 800 Hz. The reason for the drastic change of magnetic anisotropy in nanowires is attributed to the increase of cobalt content and the crystal structure phase transformation from fcc-hcp mixture at high Ni content to imp at high Co content. We explain the conversion of magnetic behavior of nanowire arrays in terms of a competition between the shape and magnetocrystalline anisotropies. (C) 2014 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhigalov V. S., Bykova L. E., Myagkov V. G., Pavlova A. N., Volochaev M. N., Matsynin A. A., Patrin G. S.
Заглавие : CoPt-Al2O3 nanocomposite films: synthesis, structure, and magnetic properties
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [18-42-243009 r_mol_a, 19-43-240003 r_a]; Foundation for Assistance to Small Innovative Enterprises in Science and Technology [11843GU/2017, 0033636]
Место публикации : J. Surf. Ingestig. - 2020. - Vol. 14, Is. 1. - P.47-53. - ISSN 1027-4510, DOI 10.1134/S102745102001022X. - ISSN 1819-7094(eISSN)
Примечания : Cited References: 29. - This study was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects no. 18-42-243009 r_mol_a and no. 19-43-240003 r_a, and the Foundation for Assistance to Small Innovative Enterprises in Science and Technology, contract no. 11843GU/2017, code 0033636, U.M.N.I.K. competition.
Предметные рубрики: SOLID-STATE SYNTHESIS
GRANULAR THIN-FILMS
THERMITE SYNTHESIS
PHASE
Аннотация: The structure and magnetic properties of CoPt–Al2O3 nanocomposite films synthesized by the annealing of Al/(Co3O4 + Pt) bilayers on a MgO(001) substrate at 650°C in vacuum are investigated. The synthesized composite films contain ferromagnetic CoPt grains with an average size of 25–45 nm enclosed in a nonconducting Al2O3 matrix. The saturation magnetization (Ms ~ 330 G) and coercivity (Hc ≈ 6 kOe) of the films are measured in the film plane and perpendicular to it. The obtained films are characterized by a spatial rotational magnetic anisotropy, which makes it possible to arbitrarily set the easy magnetization axis in the film plane or perpendicular to it using a magnetic field stronger than the coercivity (H ˃ Hc).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Khalyapin D. L., Kim P. D., Kim J., Turpanov I. A., Beten'kova A. Ya., Bondarenko G. V., Isaeva T. N., Kim I.
Заглавие : Effect of alloy formation processes in the Co-Cu system on the magnetic and magnetoresistance properties of multilayer Co/Cu films with ultrathin Co layers prepared by DC magnetron sputtering
Место публикации : Phys. Solid State. - 2010. - Vol. 52, Is. 9. - P.1787-1796. - ISSN 1063-7834, DOI 10.1134/S1063783410090015
Примечания : Cited References: 29
Предметные рубрики: GIANT MAGNETORESISTANCE
SIZE DISTRIBUTION
SPIN VALVES
EXCHANGE
TEMPERATURE
HYSTERESIS
ANISOTROPY
CU(001)
ISLANDS
Аннотация: This paper reports on a study of multilayer Co/Cu films with an effective thickness of the Co layer of similar to 3.5 , which were prepared by magnetron sputtering. The samples prepared have been found to have a metastable multiphase structure. An analysis of the data obtained by structural and, primarily, by magnetic methods has revealed that the main phases are the Co/Cu supersaturated solid solution (alloy) with a Co concentration of about 30 at %, the superparamagnetic phase, and the paramagnetic phase, which is accounted for by the presence of small (a few atoms at most) Co clusters embedded in the Cu matrix. A clearly pronounced maximum in the temperature dependences of the low-field magnetoresistance has been found, which is associated with the temperature of the magnetic phase transition of the supersaturated Co-Cu alloy.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yaroslavtsev R. N., Chekanova L. A., Komogortsev S. V., Iskhakov R. S.
Заглавие : Effect of sodium hypophosphite content to the deposition rate, structure and magnetic properties of electroless deposited Ni-P alloy
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : Solid State Phenom.: Selected, peer reviewed papers/ ed.: S. G. Ovchinnikov, A. Samardak: Trans Tech Publications, 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P.237-241. - ISSN 978-303835054-5, DOI 10.4028/www.scientific.net/SSP.215.237. - ISSN 1662-9779
Примечания : Cited References: 15
Ключевые слова (''Своб.индексиров.''): electroless coatings--nickel-phosphorus alloy
Аннотация: The deposition kinetics, structure and magnetic properties of electroless deposited films Ni-P were investigated depending on the amount of sodium hypophosphite in the electroless bath. It was found that the film deposition rate is linear and unambiguously varies with the hypophosphite content from 2 to 13 g/l and from 23 to 25 g/l. The deposition rate varies widely in the hypophosphite concentration range from 13 to 23 g/l. The films are composed of amorphous Ni-P phase and fcc Ni-P solid solution with phosphorus content from 1 to 4 at.% P according to X-ray diffraction. The partial amount of amorphous phase is increased with concentration of sodium hypophosphite. The ferromagnetic resonance field is independent on the concentration of sodium hypophosphite, which assumes to be result from the laminated allocation of the amorphous and fcc phases in the film. © (2014) Trans Tech Publications, Switzerland.
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Вид документа :
Шифр издания :
Автор(ы) : Mamalis D., Manolakos D.E., Kladas A.G., Koumoutsos A.K., Ovchinnikov S. G.
Заглавие : Electromagnetic forming of aluminum alloy sheet using a grooved die: numerical modeling
Место публикации : Phys. Met. Metallogr. - Vol. 102, Suppl. 1, Chapter 13. - P.S90-S93. - DOI 10.1134/S0031918X06140237
Примечания : Cited References: 3
Аннотация: A commercial ANSYS FE Code is employed for the simulation of the electromagnetic sheet-metal forming into a grooved die. An industrial pancake coil is considered as the forming tool. The deformation characteristics of the sheet (workpiece) as well as the electromagnetic parameters of the high-energy process are calculated numerically. An equivalent-circuit method is used to validate the electromagnetic model. The results from both analyses are in good agreement.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nyavro A. V., Cherepanov V. N., Arkhipkin V. G., Kveglis L. I., Musikhin V. A.
Заглавие : Electronic structure of grain boundaries in the Fe-86-Mn-12.7-C(1.3)alloy
Разночтения заглавия :авие SCOPUS: Electronic structure of grain boundaries in the Fe86-Mn 12.7-C1.3alloy
Место публикации : Russ. Phys. J.: SPRINGER, 2008. - Vol. 51, Is. 9. - P973-979. - ISSN 1064-8887, DOI 10.1007/s11182-009-9127-5
Примечания : Cited References: 13
Предметные рубрики: FERROMAGNETIC IRON
EXCHANGE
Аннотация: The importance of studying Fe-Mn-C alloys is related to their wide use as constructional materials in mechanical engineering. In this work an effort has been made to elucidate the physical origin of the magnetization in austenitic steels by calculating the electronic structure of grain boundaries. To theoretically investigate the magnetic properties of a crystal of ferromagnetic bcc iron, the wave functions of the iron atom calculated in view of the spin polarization of a core by the Hartree-Fock method with local exchange-correlation potentials have been used as base functions. This has made it possible to optimize the choice of a zero approximation for the description of the electronic states of ferromagnetic iron and to attain good agreement with the experimental values of the magnetic moment (A mu(theor) = 2.23A mu(B), A mu(exp) = 2.218A mu(B)), of the exchange splitting of the crystal term P-4 (Delta(theor) = Delta(exp) = 0.112 Ry), and of the cross-sections of the Fermi surface. A similar approach has been used to investigate the magnetic states of clusters (nanoclusters) based on the method of scattered waves. The approach developed for clusters of the alloy under investigation makes it possible to calculate the alloy magnetic properties in relation to the cluster size for a varied lattice parameter.
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