Owing to improved thermal stability and scalability, materials with perpendicular magnetic anisotropy (PMA) are extremely attractive. The all perpendicular magnetic tunnel junction ([Formula: see text]-MTJ) devices are primarily devoted to spin transfer torque (STT)-induced switching and few works report their microwave emission. Here, we demonstrate the basic results of RF function in nanoscale [Formula: see text]-MTJ which has two different thickness free layers separated by atom-thick tungsten insertion. The ultrathin W spacer layer not only enables the two CoFeB free layers precess as a single layer but also greatly enhances the PMA which further induces high-emission frequency. The all perpendicular spin transfer torque nano-oscillator (STNO) exhibited high frequency (7.6[Formula: see text]GHz) and large current modulation capability of [Formula: see text] at moderate external magnetic field. Along with our previous work on STT switching utilizing the similar stack, such a multifunctional structure could bring low cost solutions to Internet of Things (IoT) network applications.

中文翻译：

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所有具有复合自由层的垂直自旋纳米振荡器

由于提高了热稳定性和可扩展性，具有垂直磁各向异性 (PMA) 的材料极具吸引力。全垂直磁隧道结（[公式：见正文]-MTJ）器件主要用于自旋转移矩（STT）引起的开关，很少有工作报告它们的微波发射。在这里，我们展示了纳米级射频功能的基本结果[公式：见文本]-MTJ，它具有两个不同厚度的自由层，由原子厚的钨插入隔开。超薄的 W 间隔层不仅使两个 CoFeB 自由层能够作为单层进动，而且还大大增强了 PMA，从而进一步诱导了高发射频率。全垂直自旋转移矩纳米振荡器（STNO）表现出高频（7.6 [公式：见正文]GHz）和[公式：见正文]在中等外部磁场下的大电流调制能力。连同我们之前利用类似堆栈进行 STT 交换的工作，这种多功能结构可以为物联网 (IoT) 网络应用带来低成本解决方案。