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Your search keyword '"Proglyado, V. V."' showing total 167 results
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167 results on '"Proglyado, V. V."'

4. Tunable spin-flop transition in artificial ferrimagnets

Author

Antropov, N. O., Kravtsov, E. A., Makarova, M. V., Proglyado, V. V., Keller, T., Subbotin, I. A., Pashaev, E. M., Prutskov, G. V., Vasiliev, A. L., Chesnokov, Yu. M., Bebenin, N. G., Ustinov, V. V., Keimer, B., and Khaydukov, Yu. N.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

Spin-flop transition (SFT) consists in a jump-like reversal of antiferromagnetic magnetic moments into a non-collinear state when the magnetic field increases above the critical value. Potentially the SFT can be utilized in many applications of a rapidly developing antiferromagnetic spintronics. However, the difficulty of using them in conventional antiferromagnets lies in (a) too large switching magnetic fields (b) the need for presence of a magnetic anisotropy, and (c) requirement to apply magnetic field along the correspondent anisotropy axis. In this work we propose to use artificial ferrimagnets in which the spin-flop transition occurs without anisotropy and the transition field can be lowered by adjusting exchange coupling in the structure. This is proved by experiment on artificial Fe-Gd ferrimagnets where usage of Pd spacers allowed us to suppress the transition field by two orders of magnitude., Comment: article, 5 pages, 3 figures

Published
2021
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12. Twisted magnetization states and inhomogeneous resonance modes in a Fe/Gd ferrimagnetic multilayer

Author

Drovosekov, A. B., Savitsky, A. O., Kholin, D. I., Kreines, N. M., Proglyado, V. V., Ryabukhina, M. V., Kravtsov, E. A., and Ustinov, V. V.

Subjects
Condensed Matter - Materials Science
Abstract

Static and dynamic magnetic properties of a ferrimagnetic [Fe(35A)/Gd(50A)]x12 superlattice were investigated in a wide 4-300 K temperature range using magneto-optical Kerr effect (MOKE) and ferromagnetic resonance (FMR) techniques. The multilayer structure was sputtered on a transparent glass substrate which made it possible to perform MOKE measurements on both Fe and Gd terminated sides of the superlattice. These experiments allowed us to detect a transition between field-aligned and canted magnetic states on both sides of the film and to distinguish between the bulk and surface twisted phases of the superlattice. As a result, the experimental H-T magnetic phase diagram of the system was obtained. FMR studies at frequencies 7-36 GHz demonstrated a complex evolution of absorption spectra as temperature decreased from room down to 4 K. Two spectral branches were detected in the sample. Theoretical simulations show that the observed spectral branches correspond to different types of inhomogeneous resonance modes in the multilayer with non-uniform magnetization precession inside Gd layers.

Published
2018
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13. Effect of Cr spacer on structural and magnetic properties of Fe/Gd multilayers

Author

Drovosekov, A. B., Ryabukhina, M. V., Kholin, D. I., Kreines, N. M., Manuilovich, E. A., Savitsky, A. O., Kravtsov, E. A., Proglyado, V. V., Ustinov, V. V., Keller, T., Khaydukov, Yu. N., Choi, Y., and Haskel, D.

Subjects
Condensed Matter - Materials Science
Abstract

In this work we analyse the role of a thin Cr spacer between Fe and Gd layers on structure and magnetic properties of a [Fe(35A)/Cr(tCr)/Gd(50A)/Cr(tCr)]x12 superlattice. Samples without the Cr spacer (tCr=0) and with a thin tCr=4A are investigated using X-ray diffraction, polarized neutron and resonance X-ray magnetic reflectometry, SQUID magnetometery, magneto-optical Kerr effect and ferromagnetic resonance techniques. Magnetic properties are studied experimentally in a wide temperature range 4-300K and analysed theoretically using numerical simulation on the basis of the mean-field model. We show that a reasonable agreement with the experimental data can be obtained considering temperature dependence of the effective field parameter in gadolinium layers. The analysis of the experimental data shows that besides a strong reduction of the antiferromagnetic coupling between Fe and Gd, the introduction of Cr spacers into Fe/Gd superlattice leads to modification of both structural and magnetic characteristics of the ferromagnetic layers.

Published
2017
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31. Bending sensor based on flexible spin valve

Author

Naumova, L I, primary, Zavornitsyn, R S, additional, Milyaev, M A, additional, Bebenin, N G, additional, Pavlova, A Y, additional, Makarova, M V, additional, Maksimova, I K, additional, Proglyado, V V, additional, Zakharov, A A, additional, and Ustinov, V V, additional

Published
2023
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38. Helimagnetic and Crystallographic Growth Textures of Dysprosium Nanolayers on Co90Fe10, Nb, and β-Ta Buffer Layers.

Author

Naumova, L. I., Zavornitsyn, R. S., Milyaev, M. A., Devyaterikov, D. I., Rusalina, A. S., Krinitsyna, T. P., Pavlova, A. Yu., Proglyado, V. V., and Ustinov, V. V.

Subjects
CRYSTAL texture, BUFFER layers, DYSPROSIUM, TANTALUM, MAGNETRON sputtering, METALWORK
Abstract

Dysprosium nanolayers differing in the thickness are prepared by magnetron sputtering on Al2O3(R) substrates using Co90Fe10, β-Ta, and Nb buffer layers. The correlation between the crystallographic texture type and peculiarities of temperature dependences of electrical resistance of polycrystalline dysprosium films is studied. It is found that, in the case of deposition of Dy directly on Al2O3(R), a two-component texture forms in the rare-earth metal layer. One of the components is characterized by the hexagonal axis parallel to the film plane, whereas the other component is characterized by the axis perpendicular to the film plane. In the case of deposition of Dy on the β-Ta buffer layer, the microstructures of Al2O3 and Dy are shown to demonstrate the matching through β-Ta, and the perfection of the two-component texture increases. In the antiferromagnetic state, the texture components become "phases" differing in the orientation of magnetic helicoid axis, and the anitiferromagnetic ordering occurs at different temperatures. [ABSTRACT FROM AUTHOR]

Published
2023
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