Excitation of magnetization dynamics by pure spin currents

Injection of pure spin currents generated due to the spin Hall effect (SHE) has recently become recognized as an efficient route for the excitation of coherent magnetization auto-oscillations in magnetic nanostructures. In contrast to the devices operated by spin-polarized electrical currents, spintronic devices driven by pure spin currents are expected to be less affected by the heating and electromigration effects caused by the charge flow through the active magnetic layer. Separation of charge and spin flows also eliminates a number of constraints on the geometry and thus on the magnetic characteristics of devices.