AI 中文总结
本研究通过微磁学模拟，在CMOS兼容的W/CoFeB/MgO纳米窄条SHNO中实现了斜向磁场下高频非传播磁滴的鲁棒稳定，揭示了不同电流密度下磁滴的振荡行为及磁场对其传播特性的调控作用。
AI 中文摘要
磁滴是可在具有强垂直磁各向异性的纳米级自旋电子器件中激发的高度非线性自旋波孤子，尽管在基于纳米接触的自旋转矩振荡器中已被广泛研究，但在纯自旋电流驱动的器件（如自旋霍尔纳米振荡器（SHNO））中实现其稳定仍未实现。本文通过微磁学模拟，证明了在斜向磁场下，与CMOS兼容的W/CoFeB/MgO纳米窄条SHNO中可实现非传播高频磁滴的鲁棒稳定。窄条几何结构在非均匀有效磁场环境中产生非圆形磁滴形状，同时观测到呈现完整核心磁化反转和显著磁滞的稳定磁滴模式。在较低电流密度下，磁滴表现出周期性膨胀与收缩的呼吸振荡；而更高的驱动电流则导致磁滴漂移、变形，并在基频周围出现边带。调节外加磁场的强度和方向可改变有效磁场环境，使磁滴脱离约束并实现超过2μm的传播距离。
英文摘要
Magnetic droplets are highly nonlinear spin-wave solitons that can be excited in nanoscale spintronic devices with strong perpendicular magnetic anisotropy. Although extensively studied in nanocontact-based spin-torque oscillators, their stabilization in pure spin current-driven devices such as spin Hall nano-oscillators (SHNOs) has remained elusive. Here, we micromagnetically demonstrate the robust stabilization of non-propagating high-frequency droplets in CMOS-compatible W/CoFeB/MgO nanoconstriction SHNOs under oblique magnetic fields. While the constriction geometry gives rise to noncircular droplet shapes in an inhomogeneous effective field landscape, stable droplet modes exhibiting complete core magnetization reversal and pronounced hysteresis are observed. At lower current densities, droplets display breathing oscillations with periodic expansion and contraction, whereas higher drive currents lead to drift, deformation, and the emergence of sidebands around the fundamental frequency. Tuning the strength and orientation of the applied magnetic field alters the effective field landscape, allowing droplets to escape confinement and propagate over distances exceeding 2$μ$m.
