Magnetic domain wall dynamics in the precessional regime: Influence of the Dzyaloshinskii-Moriya interaction

International audienceThe domain wall dynamics driven by an out of plane magnetic field was measured for a series of magnetic trilayers with different strengths of the interfacial Dzyaloshinskii-Moriya interaction (DMI). The features of the field-driven domain wall velocity curves strongly depend on the ratio of the field $H_{D}$ stabilizing chiral N\'{e}el walls to the demagnetizing field within the domain wall $H_{DW}$. The measured Walker velocity, which in systems with large DMI is maintained after the Walker field, giving rise to a velocity plateau up to the Slonczewski field $H_S$, can be related to the DMI strength. Yet, when $H_{D}$ and $H_{DW}$ have comparable values, a careful analysis needs to be done in order to evaluate the impact of the DMI on the domain wall velocity. By means of a one-dimensional model and 2D simulations, we extend this method and we clarify the interpretation of the experimental curves measured for samples where $H_{D}$ and $H_{DW}$ are comparable