Spin-current induced magnetic dynamics

Spin currents, the flow of angular momentum without the simultaneous transfer of electrical charge, play an enabling role in spintronics and magnonics. Recently a lot of efforts has been made to implement the concept of spin current for description of different dynamic phenomena in magnetic systems, including spin-troque- and spin-Hall nano-oscillators, domain wall motion, and spin wave propagation.
Injection of pure spin currents generated due to the spin Hall effect has recently become recognized as an efficient route for the excitation of coherent magnetization auto-oscillations in magnetic nanostructures. Separation of charge and spin flows eliminates a number of constraints on the geometry and thus on the magnetic characteristics of devices.
Besides, pure spin currents allow one to increase or reduce the density of magnons, and achieve coherent dynamic states of magnetization reminiscent of the Bose-Einstein condensation.