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We have recently shown that injection of magnons into a magnetic dielectricvia the spin-orbit torque (SOT) effect in the adjacent layer of a heavy metalsubjected to the action of short (0.1 $\mu$s) current pulses allows for controlof a magnon Bose-Einstein Condensate (BEC). Here, the BEC was formed in theprocess of rapid cooling (RC), when the electric current heating the sample isabruptly terminated. In the present study, we show that the application of alonger (1.0 $\mu$s) electric current pulse triggers the formation of anonlinear localized magnonic bullet below the linear magnon spectrum. Afterpulse termination, the magnon BEC, as before, is formed at the bottom of thelinear spectrum, but the nonlinear bullet continues to exist, stabilized foradditional 30 ns by the same process of RC-induced magnon condensation. Ourresults suggest that a stimulated condensation of excess magnons to all highlypopulated magnonic states occurs.

Stabilization of a nonlinear bullet coexisting with a Bose-Einstein condensate in a rapidly cooled magnonic system driven by a spin-orbit torque