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Your search keyword '"Kakazei, Gleb N."' showing total 29 results
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29 results on '"Kakazei, Gleb N."'

7. Vortex dynamics in confined stratified conditions

Author

Aliev, Farkhad G., Sierra, Juan F., Awad, Ahmad A., Kakazei, Gleb N., Han, Dong-Soo, Kim, Sang-Koog, Metlushko, Vitali, Ilic, Bojan, and Guslienko, Konstantin Y.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

We report on linear spin dynamics in the vortex state of the Permalloy dots subjected to stratified (magnetic) field. We demonstrate experimentally and by simulations the existence of two distinct dynamic regimes corresponding to the vortex stable and metastable states. Breaking cylindrical symmetry leads to unexpected eigenmodes frequency splitting in the stable state and appearance of new eigenmodes in the metastable state above the vortex nucleation field. Dynamic response in the metastable state strongly depends on relative orientation of the external rf pumping and the bias magnetic fields. These findings may be relevant for different vortex states in confined and stratified conditions.

Published
2008
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8. Reflection-less width-modulated magnonic crystal

Author

Frey, Pascal, Nikitin, Aleksei A., Bozhko, Dmytro A., Bunyaev, Sergey A., Kakazei, Gleb N., Ustinov, Alexey B., Kalinikos, Boris A., Ciubotaru, Florin, Chumak, Andrii V., Wang, Qi, Tiberkevich, Vasyl S., Hillebrands, Burkard, and Serga, Alexander A.

Published
2020
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10. Scalable Flexible Electromagnetic Interference Shielding Textiles Based on MWCNTs and PEDOT:PSS

Author

Sousa, Ana Rita, primary, Matos, Renata, additional, Barbosa, José R.M., additional, Soares, O. Salomé G.P., additional, Ferreira, João, additional, Santos, Gilda, additional, Silva, Augusta, additional, Morgado, José, additional, Soares, Patrícia, additional, Bunyaev, Sergey A., additional, Kakazei, Gleb N., additional, Freire, Cristina, additional, Pereira, M. Fernando R., additional, Pereira, André M., additional, and Pereira, Clara, additional

Published
2022
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11. Design of Electromagnetic Shielding Textiles Based on Industrial‐Grade Multiwalled Carbon Nanotubes and Graphene Nanoplatelets by Dip‐Pad‐Dry Process

Author

Sousa, Ana R., primary, Matos, Renata, additional, Barbosa, José R. M., additional, Ferreira, João, additional, Santos, Gilda, additional, Silva, Augusta, additional, Morgado, José, additional, Soares, Patrícia, additional, Bunyaev, Sergey A., additional, Kakazei, Gleb N., additional, Vilarinho, Rui, additional, Soares, Olívia Salomé, additional, Pereira, Manuel Fernando, additional, Freire, Cristina, additional, Pereira, Clara, additional, and Pereira, André M., additional

Published
2022
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12. Merging of spin-wave modes in obliquely magnetized circular nanodots

Author

Kharlan, Julia, primary, Borynskyi, Vladyslav, additional, Bunyaev, Sergey A., additional, Bondarenko, Pavlo, additional, Salyuk, Olga, additional, Golub, Vladimir, additional, Serga, Alexander A., additional, Dobrovolskiy, Oleksandr V., additional, Chumak, Andrii, additional, Verba, Roman, additional, and Kakazei, Gleb N., additional

Published
2022
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14. Broadband magnetic response of periodic arrays of FeNi dots

Author

Sierra, Juan Francisco, Awad, Ahmad A., Kakazei, Gleb N., Palomares, Francisco Javier, and Aliev, Farkhad G.

Subjects
Magnetic devices -- Analysis, Magnetic resonance -- Analysis, Magnetization -- Analysis, Nanotechnology -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

We present a study of magnetization dynamics at room temperature in periodic arrays of 50 nm thick FeNi (Py) circular magnetic dots of 500 nm radius and different center to center distance (1200 and 2500 nm), by using a broadband magnetometer based on Vector Network Analyzer which works between 300 kHz and 8.5 GHz. We also present a comparison between the dynamic response, ferromagnetic resonance (FMR) and its linewidth, with static magnetic characteristics such as magnetization curves. The FMR peak appears just above the nucleation field and is perfectly described by Kittel formula taking into account the demagnetizing factor of an individual magnetic dot. In addition to FMR we observed a spin wave resonance below the uniform mode, which could be attributed to spin waves in confined systems. The FMR linewidth shows a significant broadening close to the field region corresponding to nucleation of magnetic vortex. Index Terms--Magnetic devices, magnetic resonance, nanotechnology.

Published
2008

15. How dry is dry? Molecular mobility in relation to thallus water content in a lichen

Author

Dobrovolskiy, Oleksandr V., Bunyaev, Sergey A., Vovk, Nikolay R., Navas, David, Gruszecki, Pawel, Krawczyk, Maciej, Sachser, Roland, Huth, Michael, Chumak, Andrii V., Gusliyenko, Kostyantyn, Kakazei, Gleb N., and European Commission

Subjects
resonance, films
Abstract

The increasing demand for nanoscale magnetic devices requires development of 3D magnetic nanostructures. In this regard, focused electron beam induced deposition (FEBID) is a technique of choice for direct-writing of complex nano-architectures with applications in nanomagnetism, magnon spintronics, and superconducting electronics. However, intrinsic properties of nanomagnets are often poorly known and can hardly be assessed by local optical probe techniques. Here, an original spatially resolved approach is demonstrated for spin-wave spectroscopy of individual circular magnetic elements with sample volumes down to about 10(-3) mu m(3). The key component of the setup is a coplanar waveguide whose microsized central part is placed over a movable substrate with well-separated CoFe-FEBID nanodisks which exhibit standing spin-wave resonances. The circular symmetry of the disks allows for the deduction of the saturation magnetization and the exchange stiffness of the material using an analytical theory. A good correspondence between the results of analytical calculations and micromagnetic simulations is revealed, indicating a validity of the used analytical model going beyond the initial thin-disk approximation used in the theoretical derivation. The presented approach is especially valuable for the characterization of direct-write magnetic elements opening new horizons for 3D nanomagnetism and magnonics. This work was supported by the European Commission in the framework of the Horizon 2020 Marie Sklodowska-Curie program-Research and Innovation Staff Exchange (MSCA-RISE) under grant agreement no. 644348 (MagIC). Further, support by the European Cooperation in Science and Technology via COST Action CA16218 (NANOCOHYBRI) is acknowledged. The Austrian team acknowledges support by the Austrian Science Fund (FWF) under grant no. I 4889 (CurviMag). The Portuguese team acknowledges the Network of Extreme Conditions Laboratories-NECL and Portuguese Foundation of Science and Technology (FCT) support through project no. NORTE-01-0145-FEDER-022096, POCI-0145-FEDER-030085 (NOVAMAG), and EXPL/IF/00541/2015. D. N. acknowledges the Spanish Ministry for Science, Innovation and Universities, for funding through the "Ramon y Cajal" program RYC-2017-22820. A. V. C. acknowledges support within the ERC Starting grant no. 678309 MagnonCircuits. M. K. and P. G. acknowledge support of National Science Center Poland under the project UMO-2018/30/Q/ST3/00416. K. Y. G. acknowledges support by IKERBASQUE (the Basque Foundation for Science) and by the Spanish Ministry of Economy and Competitiveness under the project FIS2016-78591-C3-3-R. Support through the Frankfurt Center of Electron Microscopy (FCEM) is gratefully acknowledged. Open access funding has been provided by the University of Vienna

Published
2020

17. Spin-Wave Relaxation by Eddy Currents in Y3Fe5O12/Pt Bilayers and a Way to Suppress It

Author

Bunyaev, Sergey A., primary, Serha, Rostyslav O., additional, Musiienko-Shmarova, Halyna Yu., additional, Kreil, Alexander J.E., additional, Frey, Pascal, additional, Bozhko, Dmytro A., additional, Vasyuchka, Vitaliy I., additional, Verba, Roman V., additional, Kostylev, Mikhail, additional, Hillebrands, Burkard, additional, Kakazei, Gleb N., additional, and Serga, Alexander A., additional

Published
2020
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20. Spin-wave spectroscopy of individual ferromagnetic nanodisks

Author

Dobrovolskiy, Oleksandr V., primary, Bunyaev, Sergey A., additional, Vovk, Nikolay R., additional, Navas, David, additional, Gruszecki, Pawel, additional, Krawczyk, Maciej, additional, Sachser, Roland, additional, Huth, Michael, additional, Chumak, Andrii V., additional, Guslienko, Konstantin Y., additional, and Kakazei, Gleb N., additional

Published
2020
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21. Spin-Wave Phase Inverter upon a Single Nanodefect

Author

Dobrovolskiy, Oleksandr V., primary, Sachser, Roland, additional, Bunyaev, Sergey A., additional, Navas, David, additional, Bevz, Volodymyr M., additional, Zelent, Mateusz, additional, Śmigaj, Wojciech, additional, Rychły, Justyna, additional, Krawczyk, Maciej, additional, Vovk, Ruslan V., additional, Huth, Michael, additional, and Kakazei, Gleb N., additional

Published
2019
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29. Control of Structural and Magnetic Properties of Polycrystalline Co 2 FeGe Films via Deposition and Annealing Temperatures.

Author

Vovk, Andrii, Bunyaev, Sergey A., Štrichovanec, Pavel, Vovk, Nikolay R., Postolnyi, Bogdan, Apolinario, Arlete, Pardo, José Ángel, Algarabel, Pedro Antonio, Kakazei, Gleb N., Araujo, João Pedro, and Fernández, Asunción

Subjects
MAGNETIC properties, MAGNETIC control, CARBON dioxide, POLYCRYSTALLINE semiconductors, MAGNETIZATION, CRYSTAL structure
Abstract

Thin polycrystalline Co2FeGe films with composition close to stoichiometry have been fabricated using magnetron co-sputtering technique. Effects of substrate temperature (TS) and post-deposition annealing (Ta) on structure, static and dynamic magnetic properties were systematically studied. It is shown that elevated TS (Ta) promote formation of ordered L21 crystal structure. Variation of TS (Ta) allow modification of magnetic properties in a broad range. Saturation magnetization ~920 emu/cm3 and low magnetization damping parameter α ~ 0.004 were achieved for TS = 573 K. This in combination with soft ferromagnetic properties (coercivity below 6 Oe) makes the films attractive candidates for spin-transfer torque and magnonic devices. [ABSTRACT FROM AUTHOR]

Published
2021
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