Perpendicular effective field induced by spin-orbit torque and magnetization damping in chiral domain walls

The effective magnetic fields induced by spin-orbit torque (SOT), Dzyaloshinsky-Moriya exchange interaction, and magnetization damping in chiral domain wall systems are very important to manipulate magnetization switching, stimulate magnetization oscillation, and drive domain wall motion in the applications of various spintronic devices. However, magnetization damping as an effective magnetic field is usually ignored in magnetization switching measured by magnetic hysteresis loops due to its dynamical and instantaneous feature. Here, we demonstrate that in addition to the dampinglike SOT effective field, the perpendicular effective field measured by the shift of Hall magnetic hysteresis curves also contains the z-direction effective fields originating from magnetization damping under the total static magnetic field. These findings provide key insights for understanding the effective magnetic fields originated from the magnetic damping and dampinglike SOT effective field in chiral domain walls, and pave the path to practical application of the chiral domain wall systems.