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19 results on '"Evelt, M."'

1. Emission of coherent propagating magnons by insulator-based spin-orbit torque oscillators

Author

Evelt, M., Soumah, L., Rinkevich, A. B., Demokritov, S. O., Anane, A., Cros, V., Youssef, Jamal Ben, de Loubens, G., Klein, O., Bortolotti, P., and Demidov, V. E.

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

We experimentally demonstrate generation of coherent propagating magnons in ultra-thin magnetic-insulator films by spin-orbit torque induced by dc electric current. We show that this challenging task can be accomplished by utilizing magnetic-insulator films with large perpendicular magnetic anisotropy. We demonstrate simple and flexible spin-orbit torque devices, which can be used as highly efficient nanoscale sources of coherent propagating magnons for insulator-based spintronic applications.

Published
2018
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2. Nano-patterned magnonic crystals based on ultrathin YIG films

Author

Collet, M., Evelt, M., Demidov, V. E., Prieto, J. L., Muñoz, M., Youssef, J. Ben, de Loubens, G., Klein, O., Bortolotti, P., Cros, V., Anane, A., and Demokritov, S. O.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We demonstrate a microscopic magnonic-crystal waveguide produced by nano-patterning of a 20 nm thick film of Yttrium Iron Garnet. By using the phase-resolved micro-focus Brillouin light scattering spectroscopy, we map the intensity and the phase of spin waves propagating in such a periodic magnetic structure. Based on these maps, we obtain the dispersion and the attenuation characteristics of spin waves providing detailed information about the physics of spin-wave propagation in the magnonic crystal. We show that, in contrast to the simplified physical picture, the maximum attenuation of spin waves is achieved close to the edge of the magnonic band gap, which is associated with non-trivial reflection characteristics of spin waves in non-uniform field potentials., Comment: 13 pages, 4 figures. Keywords: spin waves, magnonics, magnetic nanostructures

Published
2017

3. Spin-wave propagation in ultra-thin YIG based waveguides

Author

Collet, M., Gladii, O., Evelt, M., Bessonov, V., Soumah, L., Bortolotti, P., Demokritov, S. O, Henry, Y., Cros, V., Bailleul, M., Demidov, V. E., and Anane, A.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Spin-wave propagation in an assembly of microfabricated 20 nm thick, 2.5 {\mu}m wide Yttrium Iron Garnet (YIG) waveguides is studied using propagating spin-wave spectroscopy (PSWS) and phase resolved micro-focused Brillouin Light Scattering ({\mu}-BLS) spectroscopy. We show that spin-wave propagation in 50 parallel waveguides is robust against microfabrication induced imperfections. Spin-wave propagation parameters are studied in a wide range of excitation frequencies for the Damon-Eshbach (DE) configuration. As expected from its low damping, YIG allows the propagation of spin waves over long distances (the attenuation lengths is 25 {\mu}m at \mu$_{0}$H = 45 mT). Direct mapping of spin waves by {\mu}-BLS allows us to reconstruct the spin-wave dispersion relation and to confirm the multi-mode propagation in the waveguides, glimpsed by propagating spin-wave spectroscopy.

Published
2016
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4. Direct observation of dynamic modes excited in a magnetic insulator by pure spin current

Author

Demidov, V. E., Evelt, M., Bessonov, V., Demokritov, S. O., Prieto, J. L., Muñoz, M., Youssef, J. Ben, Naletov, V. V., de Loubens, G., Klein, O., Collet, M., Bortolotti, P., Cros, V., and Anane, A.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Excitation of magnetization dynamics by pure spin currents has been recently recognized as an enabling mechanism for spintronics and magnonics, which allows implementation of spin-torque devices based on low-damping insulating magnetic materials. Here we report the first spatially-resolved study of the dynamic modes excited by pure spin current in nanometer-thick microscopic insulating Yttrium Iron Garnet disks. We show that these modes exhibit nonlinear self-broadening preventing the formation of the self-localized magnetic bullet, which plays a crucial role in the stabilization of the single-mode magnetization oscillations in all-metallic systems. This peculiarity associated with the efficient nonlinear mode coupling in low-damping materials can be among the main factors governing the interaction of pure spin currents with the dynamic magnetization in high-quality magnetic insulators.

Published
2016

5. Spin Hall-induced auto-oscillations in ultrathin YIG grown on Pt.

Author

Evelt, M, Safranski, C, Aldosary, Mohammed, Demidov, VE, Barsukov, I, Nosov, AP, Rinkevich, AB, Sobotkiewich, K, Li, Xiaoqin, Shi, Jing, Krivorotov, IN, and Demokritov, SO

Abstract

We experimentally study nanowire-shaped spin-Hall nano-oscillators based on nanometer-thick epitaxial films of Yttrium Iron Garnet grown on top of a layer of Pt. We show that, although these films are characterized by significantly larger magnetic damping in comparison with the films grown directly on Gadolinium Gallium Garnet, they allow one to achieve spin current-driven auto-oscillations at comparable current densities, which can be an indication of the better transparency of the interface to the spin current. These observations suggest a route for improvement of the flexibility of insulator-based spintronic devices and their compatibility with semiconductor technology.

Published
2018

6. Amplification of spin waves in ultra-thin Yttrium Iron Garnet microwaveguides by the spin-orbit torque

Author

Evelt, M., Demidov, V. E., Bessonov, V., Demokritov, S.O., Prieto, J. L., Muñoz Sánchez, Manuel, Ben Youssef, J., Naletov, V. V., Loubens, G. de, Klein, Oliver, Collet, Martin, Garcia-Hernandez, Karim, Bortolotti, Paolo, Cros, Vicent, and Anane, Abdelmadjid

Subjects
Condensed Matter::Strongly Correlated Electrons
Abstract

Trabajo presentado en el 21st International Conference on Magnetism (ICM2018), celebrado en San Francisco (California, EE.UU.), del 15 al 20 de julio de 2018, The significant advantage of spin-orbit torque (SOT) for the emerging field of magnonics utilizing spin waves as a signal carrier in nano-circuits, is the possibility to exert spin-transfer torque over extended areas providing an opportunity to control the propagation length of spin waves. Another important advantage of SOT is the possibility to implement spin-torque devices based on low-damping insulating magnetic materials, such as Yttrium Iron Garnet (YIG). We studied the effects of SOT on the propagation of spin waves in 1 micrometer wide waveguides prepared from a 20 nm thick YIG film grown by the pulsed laser deposition and covered by an 8 nm thick layer of Pt. Propagating spin waves were detected with the submicrometer spatial resolution by using micro-focus Brillouin light scattering (BLS) spectroscopy, which allows the direct characterization of the spatial decay of propagating spin waves. The results of the measurements showed that, by using SOT, the propagation length of spin waves can be increased by nearly a factor of 10. This variation corresponds to the SOT-induced increase of the spin-wave intensity at the output of a 10 micrometer long transmission line by three orders of magnitude. Additionally, the high efficiency of our system allowed us to study the regime, where the damping is overcompensated by SOT and the true amplification of spin waves is expected. We show that, in this regime, the spin system of the YIG film is strongly overdriven, which results in the suppression of the spin-wave amplification. Our observations should stimulate both the development of advanced magnonic devices and theoretical work to deepen the understanding of the interaction of spin currents with spin waves

Published
2018

8. Nano-patterned magnonic crystals based on ultrathin YIG films: spin wave propagation and filtering

Author

Collet, Martin, Evelt, M., Merbouche, H., Demidov, V. E., Prieto, J. L., Muñoz Sánchez, Manuel, Ben Youssef, J., Loubens, G. de, Klein, Oliver, Bortolotti, Paolo, Cros, Vicent, Anane, Abdelmadjid, and Demokritov, S.O.

Abstract

Trabajo presentado en la 62nd Annual Conference on Magnetism and Magnetic Materials, celebrada en Pittsburgh (Alabama, Estados Unidos), del 6 al 9 de noviembre de 2017

Published
2017

9. Spin-Hall controlled magnetization dynamics in ultra-thin YIG films

Author

Demokritov, S.O., Demidov, V. E., Evelt, M., Prieto, J. L., Muñoz Sánchez, Manuel, Ben Youssef, J., Naletov, V. V., Loubens, G. de, Klein, Oliver, Collet, Martin, Garcia-Hernandez, Karim, Bortolotti, Paolo, Cros, Vicent, and Anane, Abdelmadjid

Abstract

Trabajo presentado en el INTERMAG Europe, celebrado en Dublín (Irlanda), del 24 al 28 de abril de 2017

Published
2017

10. High-efficiency control of spin-wave propagation in ultrathin Yttrium Iron Garnet by the spin-orbit torque

Author

Evelt, M., Demidov, V. E., Demokritov, S.O., Prieto, J. L., Muñoz Sánchez, Manuel, Ben Youssef, J., Naletov, V. V., Loubens, G. de, Klein, Oliver, Collet, Martin, Garcia-Hernandez, Karim, Bortolotti, Paolo, Cros, Vicent, and Anane, Abdelmadjid

Abstract

Trabajo presentado en la 61st Annual Conference on Magnetism and Magnetic Materials, celebrada en New Orleans (Lousiana, EE.UU), del 31 de octubre al 4 de noviembre de 2016

Published
2016

11. Spin-wave propagation in ultra-thin YIG based waveguides

Author

Collet, M., primary, Gladii, O., additional, Evelt, M., additional, Bessonov, V., additional, Soumah, L., additional, Bortolotti, P., additional, Demokritov, S. O., additional, Henry, Y., additional, Cros, V., additional, Bailleul, M., additional, Demidov, V. E., additional, and Anane, A., additional

Published
2017
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12. Direct observation of dynamic modes excited in a magnetic insulator by pure spin current

Author

German Research Foundation, Agence Nationale de la Recherche (France), Ministry of Education and Science of the Russian Federation, Kazan Federal University, Demidov, V. E., Evelt, M., Bessonov, V., Demokritov, S.O., Prieto, J. L., Muñoz Sánchez, Manuel, Ben Youssef, J., Naletov, V. V., Loubens, G. de, Klein, Oliver, Collet, Martin, Bortolotti, Paolo, Cros, Vicent, Anane, Abdelmadjid, German Research Foundation, Agence Nationale de la Recherche (France), Ministry of Education and Science of the Russian Federation, Kazan Federal University, Demidov, V. E., Evelt, M., Bessonov, V., Demokritov, S.O., Prieto, J. L., Muñoz Sánchez, Manuel, Ben Youssef, J., Naletov, V. V., Loubens, G. de, Klein, Oliver, Collet, Martin, Bortolotti, Paolo, Cros, Vicent, and Anane, Abdelmadjid

Abstract

Excitation of magnetization dynamics by pure spin currents has been recently recognized as an enabling mechanism for spintronics and magnonics, which allows implementation of spin-torque devices based on low-damping insulating magnetic materials. Here we report the first spatially-resolved study of the dynamic modes excited by pure spin current in nanometer-thick microscopic insulating Yttrium Iron Garnet disks. We show that these modes exhibit nonlinear self-broadening preventing the formation of the self-localized magnetic bullet, which plays a crucial role in the stabilization of the single-mode magnetization oscillations in all-metallic systems. This peculiarity associated with the efficient nonlinear mode coupling in low-damping materials can be among the main factors governing the interaction of pure spin currents with the dynamic magnetization in high-quality magnetic insulators.

Published
2016

13. Direct observation of dynamic modes excited in a magnetic insulator by pure spin current

Author

Demidov, V. E., primary, Evelt, M., additional, Bessonov, V., additional, Demokritov, S. O., additional, Prieto, J. L., additional, Muñoz, M., additional, Ben Youssef, J., additional, Naletov, V. V., additional, de Loubens, G., additional, Klein, O., additional, Collet, M., additional, Bortolotti, P., additional, Cros, V., additional, and Anane, A., additional

Published
2016
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14. High-efficiency control of spin-wave propagation in ultra-thin yttrium iron garnet by the spin-orbit torque

Author

Evelt, M., primary, Demidov, V. E., additional, Bessonov, V., additional, Demokritov, S. O., additional, Prieto, J. L., additional, Muñoz, M., additional, Ben Youssef, J., additional, Naletov, V. V., additional, de Loubens, G., additional, Klein, O., additional, Collet, M., additional, Garcia-Hernandez, K., additional, Bortolotti, P., additional, Cros, V., additional, and Anane, A., additional

Published
2016
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16. High-efficiency control of spin-wave propagation in ultra-thin yttrium iron garnet by the spin-orbit torque

Author

Evelt M., Demidov V., Bessonov V., Demokritov S., Prieto J., Muñoz M., Ben Youssef J., Naletov V., De Loubens G., Klein O., Collet M., Garcia-Hernandez K., Bortolotti P., Cros V., Anane A., Evelt M., Demidov V., Bessonov V., Demokritov S., Prieto J., Muñoz M., Ben Youssef J., Naletov V., De Loubens G., Klein O., Collet M., Garcia-Hernandez K., Bortolotti P., Cros V., and Anane A.

Abstract

© 2016 Author(s).We study experimentally with submicrometer spatial resolution the propagation of spin waves in microscopic waveguides based on the nanometer-thick yttrium iron garnet and Pt layers. We demonstrate that by using the spin-orbit torque, the propagation length of the spin waves in such systems can be increased by nearly a factor of 10, which corresponds to the increase in the spin-wave intensity at the output of a 10 μm long transmission line by three orders of magnitude. We also show that, in the regime, where the magnetic damping is completely compensated by the spin-orbit torque, the spin-wave amplification is suppressed by the nonlinear scattering of the coherent spin waves from current-induced excitations.

17. High-efficiency control of spin-wave propagation in ultra-thin yttrium iron garnet by the spin-orbit torque

Author

Evelt M., Demidov V., Bessonov V., Demokritov S., Prieto J., Muñoz M., Ben Youssef J., Naletov V., De Loubens G., Klein O., Collet M., Garcia-Hernandez K., Bortolotti P., Cros V., Anane A., Evelt M., Demidov V., Bessonov V., Demokritov S., Prieto J., Muñoz M., Ben Youssef J., Naletov V., De Loubens G., Klein O., Collet M., Garcia-Hernandez K., Bortolotti P., Cros V., and Anane A.

Abstract

© 2016 Author(s).We study experimentally with submicrometer spatial resolution the propagation of spin waves in microscopic waveguides based on the nanometer-thick yttrium iron garnet and Pt layers. We demonstrate that by using the spin-orbit torque, the propagation length of the spin waves in such systems can be increased by nearly a factor of 10, which corresponds to the increase in the spin-wave intensity at the output of a 10 μm long transmission line by three orders of magnitude. We also show that, in the regime, where the magnetic damping is completely compensated by the spin-orbit torque, the spin-wave amplification is suppressed by the nonlinear scattering of the coherent spin waves from current-induced excitations.

18. Direct observation of dynamic modes excited in a magnetic insulator by pure spin current

Author

Demidov V., Evelt M., Bessonov V., Demokritov S., Prieto J., Muñoz M., Ben Youssef J., Naletov V., De Loubens G., Klein O., Collet M., Bortolotti P., Cros V., Anane A., Demidov V., Evelt M., Bessonov V., Demokritov S., Prieto J., Muñoz M., Ben Youssef J., Naletov V., De Loubens G., Klein O., Collet M., Bortolotti P., Cros V., and Anane A.

Abstract

© Thte Author(s) 2016.Excitation of magnetization dynamics by pure spin currents has been recently recognized as an enabling mechanism for spintronics and magnonics, which allows implementation of spin-torque devices based on low-damping insulating magnetic materials. Here we report the first spatially-resolved study of the dynamic modes excited by pure spin current in nanometer-thick microscopic insulating Yttrium Iron Garnet disks. We show that these modes exhibit nonlinear self-broadening preventing the formation of the self-localized magnetic bullet, which plays a crucial role in the stabilization of the single-mode magnetization oscillations in all-metallic systems. This peculiarity associated with the efficient nonlinear mode coupling in low-damping materials can be among the main factors governing the interaction of pure spin currents with the dynamic magnetization in high-quality magnetic insulators.

19. Direct observation of dynamic modes excited in a magnetic insulator by pure spin current

Author

Demidov V., Evelt M., Bessonov V., Demokritov S., Prieto J., Muñoz M., Ben Youssef J., Naletov V., De Loubens G., Klein O., Collet M., Bortolotti P., Cros V., Anane A., Demidov V., Evelt M., Bessonov V., Demokritov S., Prieto J., Muñoz M., Ben Youssef J., Naletov V., De Loubens G., Klein O., Collet M., Bortolotti P., Cros V., and Anane A.

Abstract

© Thte Author(s) 2016.Excitation of magnetization dynamics by pure spin currents has been recently recognized as an enabling mechanism for spintronics and magnonics, which allows implementation of spin-torque devices based on low-damping insulating magnetic materials. Here we report the first spatially-resolved study of the dynamic modes excited by pure spin current in nanometer-thick microscopic insulating Yttrium Iron Garnet disks. We show that these modes exhibit nonlinear self-broadening preventing the formation of the self-localized magnetic bullet, which plays a crucial role in the stabilization of the single-mode magnetization oscillations in all-metallic systems. This peculiarity associated with the efficient nonlinear mode coupling in low-damping materials can be among the main factors governing the interaction of pure spin currents with the dynamic magnetization in high-quality magnetic insulators.

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