Anomalous domain wall dynamics in Ir50Mn50/Fe2CoSi bilayers.

• Anomalous saw-tooth and curved Néel domains in the Si/SiO 2 /IrMn/Fe 2 CoSi/Ta bilayers. • Saw-tooth domains attributed to higher magnetic charge density at the domain boundary induced by the IrMn layer. • Curvature for the Néel domain walls attributed to Dzyaloshinskii-Morya interaction (DMI). We report on the evidenced anomalous saw-tooth and curved domains in the Si/SiO 2 /IrMn/Fe 2 CoSi/Ta bilayers. The existence of saw-tooth domains is attributed to higher magnetic charge density at the domain boundary induced by the IrMn layer, while curved domains are apparent due to Dzyaloshinskii-Morya interaction (DMI). On the other hand, straight domain walls are apparent as a result of uni–axial anisotropy and four-fold anisotropy along the easy axis. The curvature for the domain walls decreases upon changing the angle between sample edge and the magnetic field. We believe that the present results would indeed be helpful for the development of the domain wall motion devices. [ABSTRACT FROM AUTHOR]