  We evaluate the micromagnetic energy of a domain wall contained in a thin,
horn-shaped nanostructure and propose a method to extract the strength of the
interfacial Dzyaloshinskii-Moriya interaction based on the equilibrium position
of the wall. An inplane magnetic field coupled with the interfacial DMI
balances a competing driving force related to the "nanohorn" tapering and
consequent variation in length. It is evident that the strength of the the DMI
is directly correlated to the equilibrium position of the DW. Moreover, the
range of measurable DMI values can be controlled by varying the degree of
tapering in the nanohorn. Numerical and semi-analytical calculations were
separately performed and show broad agreement. The calculations provided here
offer an alternative framework for future measurement of DMI, which has been
notoriously difficult to do experimentally.
