Nonlinear nanooptics with spin waves

• Applicants: Dr. Vladislav Demidov; Professor Dr. Günter Reiss
• Subject Area: Experimental Condensed Matter Physics
• Term: from 2008 to 2016
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 86791773

• Final Report Year: 2016

Final Report Abstract

This project is devoted to the study of high-frequency dynamic phenomena in magnetic nanostructures under influence of pure spin currents – flows of angular momentum not associated with the transfer of electrical charge. In comparison with spin-polarized electrical currents, pure spin currents allow one to reduce detrimental heating and electromigration effects in magnetic nano-devices. They also enable unprecedented geometrical flexibility of devices, which can now be based on low-loss magnetic insulators. The main achievement of the project is the demonstration of the route to accomplish generation of coherent magnetization oscillations by pure spin currents by suppressing nonlinear dynamic interactions, which are known to hinder the onset of spin current-induced magnetic autooscillations. This achievement enabled the development of novel electrically-controlled nanosize microwave oscillators for communication and signal-processing technologies. In the course of the project implementation, we have studied different spin-current driven nano-systems and were able to improve their oscillation characteristics to the technologically relevant level. We have also shown that pure spin currents can be used to efficiently control propagation characteristics of spin waves, which are presently viewed as a promising medium for nano-scale transmission and processing of signals in future-generation microelectronic circuits.

Publications

• “Magnetic nano-oscillator driven by pure spin current,” Nature Mater. 11, 1028-1031 (2012)
  V. E. Demidov, S. Urazhdin, H. Ulrichs, V. Tiberkevich, A. Slavin, D. Baither, G. Schmitz, and S. O. Demokritov
  
• “Parametric excitation of magnetization oscillations controlled by pure spin current,” Phys. Rev. B 86, 134420 (2012)
  E. R. J. Edwards, H. Ulrichs, V. E. Demidov, S. O. Demokritov, and S. Urazhdin
  
• “Optimization of Pt-based spin-Hall-effect spintronic devices,” Appl. Phys. Lett. 102, 132402 (2013)
  H. Ulrichs, V. E. Demidov, S. O. Demokritov, W. L. Lim, J. Melander, N. Ebrahim-Zadeh, and S. Urazhdin
  
• “Micromagnetic study of auto-oscillation modes in spin-Hall nano-oscillators,” Appl. Phys. Lett. 104, 042407 (2014)
  H. Ulrichs, V. E. Demidov, and S. O. Demokritov
  
• “Nanoconstriction-based spin-Hall nano-oscillator,” Appl. Phys. Lett. 105, 172410 (2014)
  V. E. Demidov, S. Urazhdin, A. Zholud, A. V. Sadovnikov, and S. O. Demokritov
  
• “Spin Hall controlled magnonic microwaveguides,” Appl. Phys. Lett. 104, 152402 (2014)
  V. E. Demidov, S. Urazhdin, A. B. Rinkevich, G. Reiss, and S. O. Demokritov
  
• “Synchronization of spin Hall nano-oscillators to external microwave signals,” Nature Commun. 5, 3179 (2014)
  V.E. Demidov, H. Ulrichs, S.V. Gurevich, S.O. Demokritov, V.S. Tiberkevich, A.N. Slavin, A. Zholud, and S. Urazhdin
  
• “Direct observation of dynamic modes excited in a magnetic insulator by pure spin current,” Sci. Rep. 6, 32781 (2016)
  V. E. Demidov, M. Evelt, V. Bessonov, S. O. Demokritov, J. L. Prieto, M. Muñoz, J. Ben Youssef, V. V. Naletov, G. de Loubens, O. Klein, M. Collet, P. Bortolotti, V. Cros, and A. Anane
  
• “High-efficiency control of spin-wave propagation in ultra-thin yttrium iron garnet by the spin-orbit torque,” Appl. Phys. Lett. 108, 172406 (2016)
  M. Evelt, V. E. Demidov, V. Bessonov, S. O. Demokritov, J. L. Prieto, M. Muñoz, J. Ben Youssef, V. V. Naletov, G. de Loubens, O. Klein, M. Collet, K. Garcia-Hernandez, P. Bortolotti, V. Cros and A. Anane