The spin torque nano-oscillators (STNOs) have garnered significant interest as a potential nanosized microwave signal generator. However, the core of magnetic radial vortex may be annihilated at the edge with the large spin polarized current density, which leads to unstable STNOs. In this work, we propose new STNOs based on a magnetic radial vortex by overcoming the annihilation of core at the edge, which was realized by adding high magnetic crystal anisotropy materials on the boundary of the nanodisk. It is found that the oscillation frequency reaches up to 2.8 GHz through a circular motion of core of magnetic radial vortex, and the radial vortex-based STNOs have advantages of small size, lower driving current. Our result has important significance to design new STNOs and provide a possible candidate for designing of spintronic devices based on magnetic radial vortex.

中文翻译：

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基于径向涡流的纳米振荡器克服了磁芯的切换

自旋扭矩纳米振荡器（STNOs）作为潜在的纳米级微波信号发生器已经引起了广泛的关注。然而，具有大的自旋极化电流密度的边缘可能会消灭径向磁涡旋的核心，从而导致不稳定的STNO。在这项工作中，我们通过克服边缘的核的the灭，提出了一种基于磁径向涡旋的新的STNO，这是通过在纳米圆盘的边界上添加高磁性晶体各向异性材料来实现的。研究发现，通过径向磁涡旋铁心的圆周运动，振荡频率高达2.8 GHz，基于径向涡旋的STNO具有体积小，驱动电流低的优点。