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Chiral magnetic materials provide a number of challenging issues such as thehighly efficient domain wall (DW) and skyrmion motions driven by electriccurrent, as of the operation principles of emerging spintronic devices. The DWsin the chiral materials exhibit asymmetric DW speed variation under applicationof in plane magnetic field. Here, we show that such DW speed asymmetry causesthe DW tilting during the motion along wire structure. It has been known thatthe DW tilting can be induced by the direct Zeeman interaction of the DWmagnetization under application of in plane magnetic field. However, ourexperimental observations manifests that there exists another dominant processwith the DW speed asymmetry caused by either the Dzyaloshinskii Moriyainteraction (DMI) or the chirality dependent DW speed variation. A theoreticalmodel based on the DW geometry reveals that the DW tilting is initiated by theDW pinning at wire edges and then, the direction of the DW tilting isdetermined by the DW speed asymmetry, as confirmed by a numerical simulation.The present observation reveals the decisive role of the DW pinning with the DWspeed asymmetry, which determines the DW geometry and consequently, thedynamics.

Magnetic Domain-Wall Tilting due to Domain-Wall Speed Asymmetry