It is well-known that a spin-transfer torque caused by a dc electric current can excite in a two-dimensional ferromagnetic film exchange-dominated magnetic solitons, often called “spin-wave bullets”, under the condition of a negative nonlinear shift of spin wave frequency. In this work, we demonstrate that in a quasi-one-dimensional (1D) case, e.g., in a nanowire spin-Hall oscillator, it is possible to excite a stable dissipative magnetic soliton, which is dominated by the dipole-dipole interaction. This dissipative magnetic soliton can be described in the framework of a 1D Ginzburg-Landau auto-oscillator model, and has the shape similar to that of the exchange-dominated spin wave bullet, but with a different spatial localization law. The influence of the dipolar interaction makes possible the stabilization of a dissipative soliton in a relatively large (micron-sized) active area of the oscillator, which is in a sharp contrast with the two-dimensional case, where the excitation of a stable spin-wave bullet was observed only in relatively small active areas having typical sizes of the order of 100 nm. The characteristics and possible applications of these dipole-dominated spin wave bullets are discussed.

中文翻译：

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准一维自旋力矩振荡器中偶极子支配的耗散磁孤子

众所周知，由直流电流引起的自旋转移力矩可以在二维铁磁薄膜交换主导的磁孤子中激发，通常称为“自旋波子弹”，在负非线性位移的条件下自旋波频率。在这项工作中，我们证明了在准一维 (1D) 情况下，例如，在纳米线自旋霍尔振荡器中，可以激发稳定的耗散磁孤子，该孤子由偶极子 - 偶极子相互作用主导。这种耗散磁孤子可以用一维Ginzburg-Landau自振模型的框架来描述，其形状类似于交换主导的自旋波子弹的形状，但具有不同的空间定域律。偶极相互作用的影响使耗散孤子在振荡器的相对较大（微米级）有源区域中稳定成为可能，这与二维情况形成鲜明对比，其中稳定自旋的激发仅在具有 100 nm 数量级的典型尺寸的相对较小的活动区域中观察到波弹。讨论了这些偶极子主导的自旋波子弹的特性和可能的​​应用。