论文标题
纳米级液滴孤子的产生和路由，而无需补偿磁阻尼
Generation and routing of nanoscale droplet solitons without compensation of magnetic damping
论文作者
论文摘要
磁性液滴Soliton是一种局部的动态自旋状态，可以用作纳米级信息载体和非线性振荡器。目前的意见是，液滴孤子的形成需要由自旋极化电流或纯旋转电流产生的扭矩来补偿磁阻尼。在这里，我们从理论上证明了纳米级液滴孤子可以在没有电磁体阻尼的情况下，在具有电压控制的磁各向异性的铁磁纳米结构中进行路由。对MGO/Fe/Fe/Mgo三层板进行微磁模拟，几乎垂直于平面磁化，我们揭示了滴液孔在纳米级栅极电极下形成的液滴孤子电极。索利顿在室温下寿命高达50 ns，并且由于非零梯度的非零梯度，可以在铁磁波导中在千分尺距离上传播。此外，我们表明，可以借助额外的半导体纳米条件电极来实现孤子对自旋装置不同输出的电气路由，从而产生了垂直磁各向异性的可控梯度。
Magnetic droplet soliton is a localized dynamic spin state which can serve as a nanoscale information carrier and nonlinear oscillator. The present opinion is that the formation of droplet solitons requires the compensation of magnetic damping by a torque created by a spin-polarized electric current or pure spin current. Here we demonstrate theoretically that nanoscale droplet solitons can be generated and routed in ferromagnetic nanostructures with voltage-controlled magnetic anisotropy in the presence of uncompensated magnetic damping. Performing micromagnetic simulations for the MgO/Fe/MgO trilayer with almost perpendicular-to-plane magnetization, we reveal the formation of the droplet soliton under a nanoscale gate electrode subjected to a sub-nanosecond voltage pulse. The soliton lives up to 50 ns at room temperature and can propagate over micrometer distances in a ferromagnetic waveguide due to nonzero gradient of the demagnetizing field. Furthermore, we show that an electrical routing of the soliton to different outputs of a spintronic device can be realized with the aid of an additional semiconducting nanostripe electrode creating controllable gradient of the perpendicular magnetic anisotropy.
