  Magnetic droplets are dynamical solitons that can be generated by locally
suppressing the dynamical damping in magnetic films with perpendicular
anisotropy. To date, droplets have been observed only in nanocontact
spin-torque oscillators operated by spin-polarized electrical currents. Here,
we experimentally demonstrate that magnetic droplets can be nucleated and
sustained by pure spin currents in nanoconstriction-based spin Hall devices.
Micromagnetic simulations support our interpretation of the data, and indicate
that in addition to the stationary droplets, propagating solitons can be also
generated in the studied system, which can be utilized for the information
transmission in spintronic applications.
