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

TL;DR

This paper demonstrates how optimized transverse magnetic field pulses can create and control planar transverse domain walls with arbitrary tilting angles in biaxial nanowires, enhancing their potential for logic and memory devices.

Contribution

It introduces a method to realize and manipulate planar transverse domain walls with arbitrary tilting angles using optimized transverse magnetic field pulses, decoupling degrees of freedom and improving wall velocity.

Findings

Optimized TMF pulses smooth twisting in TDWs.

Analytical solution for polar angle distribution derived.

Increased domain wall velocity under optimized TMF pulses.

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.