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16 results on '"Poimanov, V. D."'

1. Mapping the magnonic landscape in patterned magnetic structures

Author

Davies, C. S., Poimanov, V. D., and Kruglyak, V. V.

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

We report the development of a hybrid numerical / analytical model capable of mapping the spatially-varying distributions of the local ferromagnetic resonance (FMR) frequency and dynamic magnetic susceptibility in a wide class of patterned and compositionally modulated magnetic structures. Starting from the numerically simulated static micromagnetic state, the magnetization is deliberately deflected orthogonally to its equilibrium orientation, and the magnetic fields generated in response to this deflection are evaluated using micromagnetic software. This allows us to calculate the elements of the effective demagnetizing tensor, which are then used within a linear analytical formalism to map the local FMR frequency and dynamic magnetic susceptibility. To illustrate the typical results that one can obtain using this model, we analyze three micromagnetic systems boasting non-uniformity in either one or two dimensions, and successfully explain the spin-wave emission observed in each case, demonstrating the ubiquitous nature of the Schl\"omann excitation mechanism underpinning the observations. Finally, the developed model of local FMR frequency could be used to explain how spin waves could be confined and steered using magnetic non-uniformities of various origins, rendering it a powerful tool for the mapping of the graded magnonic index in magnonics.

Published
2017
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4. Chirality of exchange spin waves exposed: Scattering and emission from interfaces between antiferromagnetically coupled ferromagnets.

Author

Poimanov, V. D. and Kruglyak, V. V.

Subjects
*SPIN exchange, *SPIN waves, *SCATTERING (Physics), *FERROMAGNETIC materials, *CHIRALITY, *MAGNETIC fields
Abstract

We have studied the effect of chirality of the magnetization precession on the emission and scattering of spin waves from interfaces between ferromagnets with antiparallel magnetization. The need to match the chirality of the magnetization precessions at such interfaces promotes coupling between propagating modes on one side of the interface and evanescent modes on the other. This leads to the following two major effects: (i) an asymmetrical (ultimately, unidirectional) emission of spin waves from such interfaces when they are driven by an elliptically polarized magnetic field, and (ii) a strong (ultimately, complete) suppression of the transmission of spin waves incident upon such interfaces. Our results are relevant to the construction of spin-wave devices and more generally to the interpretation of measurements and numerical simulations in the field of chiral magnonics. [ABSTRACT FROM AUTHOR]

Published
2021
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5. Graded Magnonic Index and Spin Wave Fano Resonances in Magnetic Structures: Excite, Direct, Capture

Author

Kruglyak, V.V., primary, Davies, C. S., additional, Au, Y., additional, Mushenok, F. B., additional, Hrkac, G., additional, Whitehead, N. J., additional, Horsley, S. A. R., additional, Philbin, T. G., additional, Poimanov, V. D., additional, Dost, R., additional, Allwood, D. A., additional, Inkson, B. J., additional, and Kuchko, A. N., additional

Published
2017
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6. The 2021 Magnonics Roadmap

Author

Barman, Anjan, primary, Gubbiotti, Gianluca, additional, Ladak, S, additional, Adeyeye, A O, additional, Krawczyk, M, additional, Gräfe, J, additional, Adelmann, C, additional, Cotofana, S, additional, Naeemi, A, additional, Vasyuchka, V I, additional, Hillebrands, B, additional, Nikitov, S A, additional, Yu, H, additional, Grundler, D, additional, Sadovnikov, A V, additional, Grachev, A A, additional, Sheshukova, S E, additional, Duquesne, J-Y, additional, Marangolo, M, additional, Csaba, G, additional, Porod, W, additional, Demidov, V E, additional, Urazhdin, S, additional, Demokritov, S O, additional, Albisetti, E, additional, Petti, D, additional, Bertacco, R, additional, Schultheiss, H, additional, Kruglyak, V V, additional, Poimanov, V D, additional, Sahoo, S, additional, Sinha, J, additional, Yang, H, additional, Münzenberg, M, additional, Moriyama, T, additional, Mizukami, S, additional, Landeros, P, additional, Gallardo, R A, additional, Carlotti, G, additional, Kim, J-V, additional, Stamps, R L, additional, Camley, R E, additional, Rana, B, additional, Otani, Y, additional, Yu, W, additional, Yu, T, additional, Bauer, G E W, additional, Back, C, additional, Uhrig, G S, additional, Dobrovolskiy, O V, additional, Budinska, B, additional, Qin, H, additional, van Dijken, S, additional, Chumak, A V, additional, Khitun, A, additional, Nikonov, D E, additional, Young, I A, additional, Zingsem, B W, additional, and Winklhofer, M, additional

Published
2021
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7. The 2021 Magnonics Roadmap

Author

Barman, Anjan, Gubbiotti, Gianluca, Ladak, S, Adeyeye, A O, Krawczyk, M, Gräfe, J, Adelmann, C, Cotofana, S, Naeemi, A, Vasyuchka, V I, Hillebrands, B, Nikitov, S A, Yu, H, Grundler, D, Sadovnikov, A V, Grachev, A A, Sheshukova, S E, Duquesne, J-Y, Marangolo, M, Csaba, G, Porod, W, Demidov, V E, Urazhdin, S, Demokritov, S O, Albisetti, E, Petti, D, Bertacco, R, Schultheiss, H, Kruglyak, V V, Poimanov, V D, Sahoo, S, Sinha, J, Yang, H, Münzenburg, M, Moriyama, T, Mizukami, S, Landeros, P, Gallardo, R A, Carlotti, G, Kim, J-V, Stamps, R L, Camley, R E, Rana, B, Otani, Y, Yu, W, Yu, T, Bauer, G E W, Back, C, Uhrig, G S, Dobrovolskiy, O V, Budinska, B, Qin, H, van Dijken, S, Chumak, A V, Khitun, A, Nikonov, D E, Young, I A, Zingsem, B W, Winklhofer, M, Barman, Anjan, Gubbiotti, Gianluca, Ladak, S, Adeyeye, A O, Krawczyk, M, Gräfe, J, Adelmann, C, Cotofana, S, Naeemi, A, Vasyuchka, V I, Hillebrands, B, Nikitov, S A, Yu, H, Grundler, D, Sadovnikov, A V, Grachev, A A, Sheshukova, S E, Duquesne, J-Y, Marangolo, M, Csaba, G, Porod, W, Demidov, V E, Urazhdin, S, Demokritov, S O, Albisetti, E, Petti, D, Bertacco, R, Schultheiss, H, Kruglyak, V V, Poimanov, V D, Sahoo, S, Sinha, J, Yang, H, Münzenburg, M, Moriyama, T, Mizukami, S, Landeros, P, Gallardo, R A, Carlotti, G, Kim, J-V, Stamps, R L, Camley, R E, Rana, B, Otani, Y, Yu, W, Yu, T, Bauer, G E W, Back, C, Uhrig, G S, Dobrovolskiy, O V, Budinska, B, Qin, H, van Dijken, S, Chumak, A V, Khitun, A, Nikonov, D E, Young, I A, Zingsem, B W, and Winklhofer, M

Abstract

Magnonics is a budding research field in nanomagnetism and nanoscience that addresses the use of spin waves (magnons) to transmit, store, and process information. The rapid advancements of this field during last one decade in terms of upsurge in research papers, review articles, citations, proposals of devices as well as introduction of new sub-topics prompted us to present the first roadmap on magnonics. This is a collection of 22 sections written by leading experts in this field who review and discuss the current status besides presenting their vision of future perspectives. Today, the principal challenges in applied magnonics are the excitation of sub-100 nm wavelength magnons, their manipulation on the nanoscale and the creation of sub-micrometre devices using low-Gilbert damping magnetic materials and its interconnections to standard electronics. To this end, magnonics offers lower energy consumption, easier integrability and compatibility with CMOS structure, reprogrammability, shorter wavelength, smaller device features, anisotropic properties, negative group velocity, non-reciprocity and efficient tunability by various external stimuli to name a few. Hence, despite being a young research field, magnonics has come a long way since its early inception. This roadmap asserts a milestone for future emerging research directions in magnonics, and hopefully, it will inspire a series of exciting new articles on the same topic in the coming years.

Published
2021
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8. The 2021 Magnonics Roadmap

Author

Barman, A., Gubbiotti, G., Ladak, S., Adeyeye, A. O., Krawczyk, M., Gräfe, J., Chumak, A. V., Khitun, A., Nikonev, D., Young, I. A., Vasyuchka, V. I., Hillebrands, B., Nikitov, S. A., Yu, H., Grundler, D., Sadovnikov, A. V., Grachev, A. A., Sheshukova, S. E., Duquesne, J.-Y., Marangolo, M., Csaba, G., Porod, W., Demidov, V. E., Urazhdin, S., Demokritov, S. O., Albisetti, E., Petti, D., Bertacco, R., Schultheiß, H., Kruglyak, V. V., Poimanov, V. D., Sahoo, S., Sinha, J., Moriyama, T., Mizukami, S., Yang, H., Münzenburg, M., Landeros, P., Gallardo, R. A., Carlotti, G., Kim, J.-V., Stamps, R. L., Camley, R. E., Rana, B., Otani, Y., Yu, W., Yu, T., Bauer, G. E. W., Back, C., Uhrig, G. S., Dobrovolskiy, O. V., Dijken, S., Budinska, B., Qin, H., Adelmann, C., Cotofana, S., Naeemi, A., Zingsem, B. W., Winklhofer, M., Barman, A., Gubbiotti, G., Ladak, S., Adeyeye, A. O., Krawczyk, M., Gräfe, J., Chumak, A. V., Khitun, A., Nikonev, D., Young, I. A., Vasyuchka, V. I., Hillebrands, B., Nikitov, S. A., Yu, H., Grundler, D., Sadovnikov, A. V., Grachev, A. A., Sheshukova, S. E., Duquesne, J.-Y., Marangolo, M., Csaba, G., Porod, W., Demidov, V. E., Urazhdin, S., Demokritov, S. O., Albisetti, E., Petti, D., Bertacco, R., Schultheiß, H., Kruglyak, V. V., Poimanov, V. D., Sahoo, S., Sinha, J., Moriyama, T., Mizukami, S., Yang, H., Münzenburg, M., Landeros, P., Gallardo, R. A., Carlotti, G., Kim, J.-V., Stamps, R. L., Camley, R. E., Rana, B., Otani, Y., Yu, W., Yu, T., Bauer, G. E. W., Back, C., Uhrig, G. S., Dobrovolskiy, O. V., Dijken, S., Budinska, B., Qin, H., Adelmann, C., Cotofana, S., Naeemi, A., Zingsem, B. W., and Winklhofer, M.

Abstract

Magnonics is a rather young physics research field in nanomagnetism and nanoscience that addresses the use of spin waves (magnons) to transmit, store, and process information. After several papers and review articles published in the last decade, with a steadily increase in the number of citations, we are presenting the first Roadmap on Magnonics. This a collection of 22 sections written by leading experts in this field who review and discuss the current status but also present their vision of future perspectives. Today, the principal challenges in applied magnonics are the excitation of sub-100 nm wavelength magnons, their manipulation on the nanoscale and the creation of sub-micrometre devices using low-Gilbert damping magnetic materials and the interconnections to standard electronics. In this respect, magnonics offers lower energy consumption, easier integrability and compatibility with CMOS structure, reprogrammability, shorter wavelength, smaller device features, anisotropic properties, negative group velocity, non-reciprocity and efficient tunability by various external stimuli to name a few. Hence, despite being a young research field, magnonics has come a long way since its early inception. This Roadmap represents a milestone for future emerging research directions in magnonics and hopefully it will be followed by a series of articles on the same topic.

Published
2021

10. Boundary conditions for scattering problems of exchange spin waves in inhomogeneous magnetic structures

Author

null Poimanov V. D.

Abstract

A method for obtaining boundary conditions for magnetization in ferromagnetic structures with an inhomogeneous ground state --- a relativistic and exchange spiral caused by the presence of competing exchange interactions --- is proposed in this paper within the framework of a lattice model with a subsequent passage to the limit to the continuum. It is shown that such conditions are the equations of the dynamics of the magnetization of those boundary spins in which the symmetry is broken in comparison with the internal ones. Keywords: scattering of exchange spin waves, exchange spiral, relativistic spiral, boundary conditions for magnetization.

Published
2022
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12. Resonant enhancement of damping within the free layer of a microscale magnetic tunnel valve.

Author

Keatley, P. S., Kruglyak, V. V., Neudert, A., Hicken, R. J., Poimanov, V. D., Childres, J. R., and Katine, J. A.

Subjects
MAGNETISM, MAGNETIZATION, MAGNETIC moments, MAGNETIC anisotropy, MAGNETIC properties
Abstract

Picosecond magnetization dynamics in the free and pinned layers of a microscale magnetic tunnel valve have been studied using time-resolved scanning Kerr microscopy. A comparison of the observed dynamics with those of individual free and pinned layers allowed the effect of interlayer coupling to be identified. A weak interlayer coupling in the tunnel valve continuous film reference sample was detected in bulk magnetometry measurements, while focused Kerr magnetometry showed that the coupling was well maintained in the patterned structure. In the tunnel valve, the free layer precession was observed to have reduced amplitude and an enhanced relaxation. During magnetization reversal in the pinned layer, its frequency approached that of the low frequency mode associated with the free layer. At the pinned layer switching field, the linewidth of the free layer became similar to that of the pinned layer. The similarity in their frequencies promotes the formation of precessional modes that exhibit strong collective properties such as frequency shifting and enhanced linewidth, while inhomogeneous magnetization of the pinned layer during reversal may also play a role in these observations. The collective character of precessional dynamics associated with mixing of the free and pinned layer magnetization dynamics must be accounted for even in tunnel valves with a small interlayer coupling. [ABSTRACT FROM AUTHOR]

Published
2015
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