论文标题
传播磁液滴孤子作为可移动的纳米级自旋波源，具有可调的发射方向
Propagating magnetic droplet solitons as moveable nanoscale spin-wave sources with tunable direction of emission
论文作者
论文摘要
磁性液滴是强烈的非线性和局部自旋孤子，可以在电流驱动的纳米角色中形成。在这里，我们提出了一种简单的方法，可以在不均匀的纳米波导中发射液滴。我们使用液滴的漂移运动，并显示在具有破裂的翻译对称性的系统中，液滴获得了线性动量并传播。我们发现，液滴速度可以通过对称性和纳米接触大小的突破强度来调节。此外，我们证明了发射的液滴可以在具有合理阻尼的现实系统中传播几微米。最后，我们演示了歼灭液滴如何将其动量传递到具有带有纳米波长的可调波矢量的高度非注射自旋波爆发。这种传播的液滴可以用作纳米级宏伟网络中的可移动自旋波源。提出的方法可以完全控制自旋波发射方向，从而可以在很大程度上扩展使用单个自旋波源设计集成的宏伟电路的自由度。
Magnetic droplets are strongly nonlinear and localized spin-wave solitons that can be formed in current-driven nanocontacts. Here, we propose a simple way to launch droplets in an inhomogeneous nanoscopic waveguide. We use the drift motion of a droplet and show that in a system with broken translational symmetry, the droplet acquires a linear momentum and propagates. We find that the droplet velocity can be tuned via the strength of the break in symmetry and the size of the nanocontact. In addition, we demonstrate that the launched droplet can propagate up to several micrometers in a realistic system with reasonable damping. Finally, we demonstrate how an annihilating droplet delivers its momentum to a highly nonreciprocal spin-wave burst with a tunable wave vector with nanometer wavelengths. Such a propagating droplet can be used as a moveable spin-wave source in nanoscale magnonic networks. The presented method enables full control of the spin-wave emission direction, which can largely extend the freedom to design integrated magnonic circuits with a single spin-wave source.
