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Achieving high velocities of magnetic domain walls is a crucial factor fortheir use as information carriers in modern nanoelectronic applications. Innanomagnetism and spintronics, these velocities are often limited either byinternal domain wall instabilities, known as the Walker breakdown phenomenon,or by spin wave emission, known as the magnonic regime. In the rigid domainwall model, the maximum magnon velocity acts as an effective "speed of light",providing a relativistic analogy for the domain wall speed limitation.Cylindrical magnetic nanowires are an example of systems with the absence ofthe Walker breakdown phenomenon. Here we demonstrate that in cylindricalnanowires with high magnetization such as Iron, also the magnonic limit couldbe outstandingly surpassed. Our numerical modelling shows the Bloch pointdomain wall velocities as high as 14 km/s, well above the magnonic limitestimated in the interval 1.7-2.0 km/s. The key ingredient is the conical shapeof the domain wall which elongates and breaks during the dynamics, leading todomain wall acceleration due to the jet propulsion effect. This effect will bevery important for three-dimensional spintronic networks based on cylindricalmagnetic nanowires.

Giant supermagnonic Bloch point velocities by jet propulsion effect in cylindrical ferromagnetic nanowires