Excitation and control of magnetization dynamics by nonlocal spin injection
Final Report Abstract
This project is devoted to the study of magnetization dynamics induced by pure spin currents generated by nonlocal spin injection mechanism. In particular, we study the possibilities to excite microwave-frequency magnetic oscillations and propagating spin waves in nano-devices driven by dc currents. This approach is particularly important for the emerging field of magnonics, considering utilization of spin waves for energy-efficient nano-scale transmission and processing of information. The main achievement of the project is the first demonstration of the excitation of coherent propagating spin waves by pure spin currents in conductive and insulating magnetic materials, which creates essentially new possibilities for magnonics. It provides a route to address one of the main challenges in this field – implementation of power-efficient conversion of electric signals into spin waves. In particular, magnonic devices utilizing the approaches elaborated within this project, do not require external microwave sources. Instead, the microwave-frequency signals can now be generated directly in the magnonic nano-device. Additionally, the demonstrated spin currentdriven excitation mechanisms are free from the limitations typical for the linear inductive excitation technique, which does not allow one to efficiently excite spin waves with wavelengths smaller than the lateral size of the emitter. Therefore, they can be utilized in devices operating in the sub- 100 nm regime, which is crucial for the possibility of further device miniaturization.
Publications
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“Dipolar field-induced spin-wave waveguides for spin-torque magnonics,” Appl. Phys. Lett. 106, 022403 (2015)
V. E. Demidov, S. Urazhdin, A. Zholud, A. V. Sadovnikov, and S. O. Demokritov
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“Spectral linewidth of spin-current nano-oscillators driven by nonlocal spin injection,” Appl. Phys. Lett. 107, 202402 (2015)
V. E. Demidov, S. Urazhdin, B. Divinskiy, A. B. Rinkevich, and S. O. Demokritov
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“Excitation of coherent propagating spin waves by pure spin currents,” Nat. Commun. 7, 10446 (2016)
V. E. Demidov, S. Urazhdin, R. Liu, B. Divinskiy, A. Telegin, and S. O. Demokritov
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“Mutual synchronization of nano-oscillators driven by pure spin current,” Appl. Phys. Lett. 109, 162402 (2016)
S. Urazhdin, V. E. Demidov, R. Cao, B. Divinskiy, V. Tyberkevych, A. Slavin, A. B. Rinkevich, and S. O. Demokritov
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“Route toward high-speed nano-magnonics provided by pure spin currents,” Appl. Phys. Lett. 109, 252401 (2016).
B. Divinskiy, V. E. Demidov, S. O. Demokritov, A. B. Rinkevich, and S. Urazhdin
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“Magnetization oscillations and waves driven by pure spin currents,” Phys. Rep. 673, 1–31 (2017)
V. E. Demidov, S. Urazhdin, G. de Loubens, O. Klein, V. Cros, A. Anane, S. O. Demokritov
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“Emission of coherent propagating magnons by insulator-based spin-orbit-torque oscillators,” Phys. Rev. Appl. 10, 041002 (2018)
M. Evelt, L. Soumah, A. B. Rinkevich, S. O. Demokritov, A. Anane, V. Cros, Jamal Ben Youssef, G. de Loubens, O. Klein, P. Bortolotti, and V. E. Demidov
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“Excitation and Amplification of Spin Waves by Spin–Orbit Torque” Adv. Mater. 30, 1802837 (2018)
B. Divinskiy, V. E. Demidov, S. Urazhdin, R. Freeman, A. B. Rinkevich, and S. O. Demokritov
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“Relation between unidirectional spin Hall magnetoresistance and spin current-driven magnon generation” Appl. Phys. Lett. 113, 062403 (2018)
I. V. Borisenko, V. E. Demidov, S. Urazhdin, A. B. Rinkevich, and S. O. Demokritov
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“Spin Hall-induced auto-oscillations in ultrathin YIG grown on Pt,” Sci. Rep. 8, 1269 (2018)
M. Evelt, C. Safranski, M. Aldosary, V. E. Demidov, I. Barsukov, A. P. Nosov, A. B. Rinkevich, K. Sobotkiewich, Xiaoqin Li, Jing Shi, I. N. Krivorotov, and S. O. Demokritov
