E. E. Shalygina
Moscow State University
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Featured researches published by E. E. Shalygina.
Solid State Phenomena | 2012
E. E. Shalygina; Alisa Rozhnovskaya; A.N. Shalygin
Results on the investigation of magnetic and magneto-optical properties of Fe/NML/Fe (NML: Mo, Ta) thin-film systems are presented. The examined samples were prepared by DC magnetron sputtering technique. The hysteresis loops and spectral dependencies of the transverse Kerr effect (TKE) were measured employing the magneto-optical magnetometer and the magneto-optical spectrometer, respectively. The saturation field of the examined trilayers was revealed to oscillate as a function of the NML layer thickness, and the period of these oscillations to depend on the Fe layer thickness. The TKE spectra of the studied systems were found to be identical but the TKE values depend on the thickness of both Fe and Mo, Ta layers.
Physics of the Solid State | 2012
E. E. Shalygina; N. V. Umnova; P. P. Umnov; V. V. Molokanov; V. V. Samsonova; A.N. Shalygin; A. A. Rozhnovskaya
The magnetic properties of initial and heat-treated Co69Fe4Cr4Si12B11 microwires in a glass shell with the diameter D = 125 μm and the diameter of the amorphous metallic core d = 90 μm produced by the Ulitovsky-Taylor method have been studied. It has been found that the magnetic characteristics, in particular, the saturation field HS and the coercive force HC of the samples annealed at a temperature T < 300°C do not differ from HS and HC of the initial microwire, and those of the samples annealed at T ≥ 400°C increase by almost one order of magnitude. The obtained experimental data have been explained by the structural features of the microwires. The near-surface values of HS and HC at T < 300°C are found to be larger than the bulk values by a factor of 5–10. These experimental data have been explained by the existence of structural and chemical ingomogeneities in the near-surface layer, which are inherent in amorphous materials. This difference decreases with a further increase in the annealing temperature, but HS and HC increase substantially. This fact has been explained by the beginning of the microwire crystallization.
Solid State Phenomena | 2015
E. E. Shalygina; Elena Gan’shina; A.M. Kharlamova; Aleksander N. Mukhin; G. V. Kurlyandskaya; A. V. Svalov
The magnetic and magneto-optical properties of the Co/Si/Co thin-film samples obtained by magnetron sputtering were investigated employing magnetooptical techniques. The thickness of the Co layers was equal to 5 nm, and Si layer thickness varied in the interval of 0.2 to 3.2 nm. The magnetic saturation field of the samples under study was found to oscillate in the magnitude with the change of the Si layer thickness. This result was explained by structural features of the Co/Si/Co multilayers and the presence of the antiferromagnetic exchange coupling between magnetic layers via the silicon interlayer. The peculiarities of the magneto-optical spectra of the Co/Si/Co samples were measured and discussed.
Technical Physics Letters | 2011
E. E. Shalygina; A. A. Rozhnovskaya; A.N. Shalygin
The magnetic properties of Fe/NML/Fe thin-film structures with Mo and Ta non-magnetic layers (NMLs) grown by magnetron sputtering have been studied using magnetooptical techniques. It is established that the saturation field (HS) of the samples exhibits oscillations as a function of the NML thickness (tNML) and the period of oscillations depends on the thickness of iron layers. This behavior of HS(tNML) is explained by the oscillatory character of exchange coupling between the ferromagnetic layers.
Solid State Phenomena | 2009
E. E. Shalygina; G.V. Maximova; Komarova; A.N. Shalygin; L.V. Kozlovskii
Results on the investigation of magnetic and magneto-optical properties of nanocrystalline Fe/Zr and Fe/Zr, Mo/Fe thin-film systems are presented. The examined samples were prepared by DC magnetron sputtering technique. The structural investigations of the samples were performed by X-ray diffraction analysis. The hysteresis loops and spectral dependencies of the transverse Kerr effect were measured employing the magneto-optical magnetometer and the magneto-optical spectrometer, respectively. The influence of the Zr and Mo layer thickness on the magnetic and magneto-optical properties of the examined samples was observed.
Japanese Journal of Applied Physics | 2016
E. E. Shalygina; A. V. Svalov; A.M. Kharlamova; E.A. Gan'shina; Dmitriy Doronin; G. V. Kurlyandskaya
The magneto-optical and magnetic properties of Co (50 A)/Bi/Co (50 A) and Bi/Co (50 A) samples are investigated. Magneto-optical investigations indicate that the shapes of transverse Kerr effect (TKE) spectra are similar for all studied samples. TKE values decrease for the Co/Bi/Co structures at t Bi > 40 A and for the Co/Bi samples at t Bi > 5 A as compared with TKE values of the single-layer Co thin film. The decrease in the volume ratio of the magnetic to nonmagnetic phases causes the reduction in the contribution of the magnetic phase to magneto-optical signals. Magnetic investigations show that the saturation field and coercivity of the studied samples increase with increasing t Bi. The exchange oscillatory coupling between Co layers through the Bi spacer in Co/Bi/Co samples with various periods (short and long) is observed in the t Bi range from 2 to 500 A. These data are explained by the dependence of Fermi energy on Bi thickness and the changes in the Bi band structure with the decrease in t Bi.
Inorganic Materials: Applied Research | 2016
V. V. Molokanov; T. R. Chueva; P. P. Umnov; E. E. Shalygina; S. V. Simakov
Samples of rapidly -quenched ribbons and wires with a diameter of metal core of dс= 50–200 μm within the ternary eutectic system Fe75Si10B15–Co75Si10B15–Ni75Si10B15 were obtained by the melt spinning and Ulitovsky–Taylor methods. The liquidus surface and crystallization surface of the amorphous alloys were constructed on the basis of the results of investigations of the thermal, mechanical and magnetic properties of the system alloys; the concentration ranges of amorphous alloys with various crystallization mechanisms and the ranges of amorphous alloys with the positive and negative Villari effect were determined. The concentration range of compositions favorable for obtaining amorphous wires with high glass-forming ability was determined. The comparative study of the structure and properties of the “thick” wires samples was carried out for two models alloys: Co71Fe4Si10B15 and Fe31Co34Ni10Si10B15. It was found that the wires possess a new complex of high strength, ductile, elastic, and soft magnetic properties. The prospects for application of “thick” ferromagnetic amorphous wires associated with the development of new types of structural and functional materials were considered.
Moscow University Physics Bulletin | 2018
E. E. Shalygina; A. V. Makarov; A.M. Kharlamova
The results of investigation of the structural and magnetic characteristics of Co/Cu/Co thin-film systems obtained by magnetron sputtering on glass substrates are presented. The thickness of the cobalt layer in all samples was 5 nm and the thickness of the copper layer was varied from 0.5 to 4 nm. The saturation field HS of the studied samples was found to oscillate in magnitude with changes in the copper-layer thickness with a period on the order of 1 nm. The maximum values of HS are observed for the thin-film systems with tCu = 1.4, 2.2, and 3.2 nm. The hysteresis loops measured for these systems in a magnetic field applied along the easy magnetization axis of the samples have a two-stage shape, while for the samples with other values of tCu the hysteresis loops are rectangular. These data are explained by the presence of exchange coupling between the ferromagnetic layers through a copper spacer and its oscillating behavior with changing tCu.
Solid State Phenomena | 2015
E. E. Shalygina; Aleksander N. Shalygin; A.M. Kharlamova; Vaycheslav V. Molokanov; Tatiana R. Chueva; Pavel. P. Umnov; Nadejda V. Umnova
Results of the investigation of the mechanical, elastic and magnetic characteristics of the “thick” Fe73,5Si13,5B9Nb3Cu1 amorphous microwires, produced by the modernized Ulitovsky–Taylor method, are presented. The cores of the Fe73,5Si13,5B9Nb3Cu1 microwires were found to have the stable geometric parameters along their length and the smooth (almost without defects) surface. The microwires are characterized by the high plasticity and the high strength. The stable geometric parameters of the Fe73,5Si13,5B9Nb3Cu1 microwires along their lengths cause the slight dispersion of magnetic anisotropy of the near-surface layers. As a result, the microwires exhibit the high homogeneity of the near-surface local magnetic properties. The strong influence of the stretching and torsion tensions on the remagnetization signal of the microwires was discovered.
Russian Metallurgy | 2015
V. V. Molokanov; T. R. Chueva; P. P. Umnov; N. V. Umnova; A. V. Krutilin; E. E. Shalygina; A.M. Kharlamova; A.N. Shalygin
Amorphous Fe73.5Si13.5B9Nb3Cu1 alloy microwires 19–50 μm in diameter are fabricated by the Ulitovskii-Taylor method. The mechanism of crystallization of the amorphous microwires is shown to be analogous to the mechanism of crystallization of an amorphous ribbon made of the same alloy. Microwires up to 30 μm in diameter are found to exhibit ductility upon bending. The near-surface magnetic properties of the microwires are shown to depend on the microwire diameter. The magnetic properties of the amorphous microwires are highly sensitive to elastic tensile and torsional strains in an ac magnetic field.
