General planar transverse domain walls realized by optimized transverse magnetic field pulses in magnetic biaxial nanowires

Abstract: We report the realization of a planar transverse domain wall (TDW) with arbitrary tilting angle in a magnetic biaxial nanowire under a transverse magnetic field (TMF) pulse with fixed strength and optimized orientation profile. We smooth any twisting in azimuthal angle plane of a TDW and thus completely decouple the polar and azimuthal degrees of freedom. The analytical differential equation that describes the polar angle distribution is then derived and the resulting solution is not a Walker-ansatz form. With this optimized TMF pulse comoving, the field-driven dynamics of the planar TDW is investigated. It turns out the comoving TMF pulse increases the wall velocity under the same axial driving field. These results will help to design a series of modern logic and memory nanodevices based on general planar TDWs.