  An experimentally feasible energy-storage concept is formulated based on
vorticity (hydro)dynamics within an easy-plane insulating magnet. The free
energy, associated with the magnetic winding texture, is built up in a circular
easy-plane magnetic structure by injecting a vorticity flow in the radial
direction. The latter is accomplished by electrically induced spin-transfer
torque, which pumps energy into the magnetic system in proportion to the vortex
flux. The resultant magnetic metastable state with a finite winding number can
be maintained for a long time because the process of its relaxation via phase
slips is exponentially suppressed when the temperature is well below the Curie
temperature. We propose to characterize the vorticity-current interaction
underlying the energy-loading mechanism through its contribution to the
effective electric inductance in the rf response. Our proposal may open an
avenue for naturally powering spintronic circuits and nontraditional
magnet-based neuromorphic networks.
