论文标题
360 $^{\ CIRC} $域中的域墙的调查：拓扑，手性和电流驱动动力学
Survey of 360$^{\circ}$ domain walls in magnetic heterostructures: topology, chirality and current-driven dynamics
论文作者
论文摘要
磁性异孔结构（MHS）中拓扑非平地360 $^{\ circ} $域壁（360dws）的手性和电流驱动的动力学已系统地研究。对于具有正常底物的MHS，静态360DW是Néel-type，没有任何手性。对于那些具有重金属底物的人，其中的界面dzyaloshinskii-moriya相互作用（IDMI）使360DWS更喜欢特定的手性。在平面内驾驶电荷电流下，作为“全圆形”拓扑的直接结果，特定的360DW不会像研究良好的180 $^{\ circ} $域壁那样经历“ Walker崩溃”型过程，因为当前密度会增加。另外，它可以保持固定的繁殖模式（根据MH的有效阻尼常数）（稳定流量或前流流），直到当电流密度过高时它崩溃或变为其他类型的sulition。同样，磁场状自旋轨道扭矩（SOT）对360DW的动力学没有影响，而抗阻尼SOT具有。对于这两种模式，都提供了IDMI和抗阻尼SOT的360DW的迁移率的修改。
Chirality and current-driven dynamics of topologically nontrivial 360$^{\circ}$ domain walls (360DWs) in magnetic heterostructures (MHs) are systematically investigated. For MHs with normal substrates, the static 360DWs are Néel-type with no chirality. While for those with heavy-metal substrates, the interfacial Dzyaloshinskii-Moriya interaction (iDMI) therein makes 360DWs prefer specific chirality. Under in-plane driving charge currents, as the direct result of "full-circle" topology a certain 360DW does not undergo the "Walker breakdown"-type process like a well-studied 180$^{\circ}$ domain wall as the current density increases. Alternatively, it keeps a fixed propagating mode (either steady-flow or precessional-flow, depending on the effective damping constant of the MH) until it collapses or changes to other types of solition when the current density becomes too high. Similarly, the field-like spin-orbit torque (SOT) has no effects on the dynamics of 360DWs, while the anti-damping SOT has. For both modes, modifications to the mobility of 360DWs by iDMI and anti-damping SOT are provided.
