Engineering Planar Transverse Domain Walls In Biaxial Magnetic Nanostrips By Tailoring Transverse Magnetic Fields With Uniform Orientation

In the past decades,magnetic nanostructures have become essential parts of nanodevices in modern information industry.Various magnetic structures offer a wide range of options for defining zeros and ones in the binary world.Among them,the most common ones are magnetic domains with different orientations of magnetic moments therein.Accordingly,the transition regions between them are the so-called magnetic domain walls.The movement of these magnetic domain walls leads to the transmission and processing of data.Therefore,systematic investigation on the statics and dynamics of magnetic domain walls is important not only for understanding the basic physics of magnetism,but also for the development of modern information technology.In magnetic nanostrips with rectangular cross sections,numerical calculations confirm the existence of a critical cross-sectional area:below(above)it,transverse(vortex)domain walls are energetically preferred.Thus,in sufficiently thin nanostrips,transverse domain walls(TDW)become the main research focus,and their velocity under external driving factors(magnetic fields,spin-polarized currents,etc.)determines the performance of nanodevices bsed on their propagation.In this work,we perform analytical investigation on the preparation and various features of planar TDWs(pTDWs): by exerting a proper transverse magnetic field(TMF)with uniform orientation and adjustable strength along strip axis,a pTDW with arbitrary azimuthal angle can be obtained.For statics,the prepared pTDW has arbitrary tilting angle,clear boundary and controllable width.When these pTDWs(with the corresponding TMF profile)are driven by axial fields,they will propagate faster than those described by the classical Walker ansatz,thus achieves our another research goal: higher domain wall speed.