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Time-resolved ultrafast EUV magnetic scattering was used to test a recentprediction of >10 km/s domain wall speeds by optically exciting a magneticsample with a nanoscale labyrinthine domain pattern. Ultrafast distortion ofthe diffraction pattern was observed at markedly different timescales comparedto the magnetization quenching. The diffraction pattern distortion shows athreshold-dependence with laser fluence, not seen for magnetization quenching,consistent with a picture of domain wall motion with pinning sites. Supportedby simulations, we show that a speed of $\approx$ 66 km/s for highly curveddomain walls can explain the experimental data. While our data agree with theprediction of extreme, non-equilibrium wall speeds locally, it differs from thedetails of the theory, suggesting that additional mechanisms are required tofully understand these effects.

Evidence of extreme domain wall speeds under ultrafast optical excitation