  Using in-plane field dependence of the precessional flow of chiral domain
walls (DWs) to simultaneously determine bulk and interfacial
Dzyaloshinskii-Moriya interactions (DMIs) is proposed. It is found that
effective fields of bulk and interfacial DMIs have respectively transverse and
longitudinal components that affect differently the motion of chiral DWs in
magnetic narrow heterostructure strips. The in-plane field dependence of DW
velocity has a dome-shape or a canyon-shape, depending on whether the driving
force is an in-plane current or an out-of-plane magnetic field. The responses
of their center shifts to the reversal of topological wall charge and
current/field direction uniquely determine the nature and strength of DMI
therein. Operable procedures are proposed and applied to explain existing
experimental data.

Mesoscale and Nanoscale Physics