论文标题
在没有外部偏置磁场的情况下，三层磁性隧道连接处的高频微波排放
High Frequency Microwave Emission of a Tri-layer Magnetic Tunnel Junction in the Absence of External Bias-Magnetic Field
论文作者
论文摘要
我们对DC电流诱导的微波发射（MTJ）进行了一项实验研究，该发射由三个有源磁层组成。对于这种三层结构，除了传统的双层正交MTJ外，还包含垂直自由层和平面固定层，还引入了第二个垂直层。我们发现，在没有任何施加的磁场的情况下，自旋转移扭矩（STT）诱导的微波发射频率可以达到6 GHz。此外，对于两种电流极化，都可以观察到微波发射，在这些极化中，当电流的幅度增加时会看到红移。我们讨论观察到的双向高频发射和红移的物理起源的自旋动力学。在此三层MTJ结构中表现出的不同微波发射特性可能对将来在纳米级旋转器设备（如微波通信和神经形态计算）中的应用中有用。
We perform an experimental study of DC current induced microwave emission in a magnetic tunnel junction (MTJ) consisting of three active magnetic layers. For this tri-layer structure, in addition to a conventional bilayer orthogonal MTJ containing a perpendicular free layer and an in-plane fixed layer, a second perpendicular layer has been introduced. We found that the microwave emission frequency induced by spin-transfer torque (STT) can reach as high as 6 GHz in the absence of any applied magnetic field. Moreover, microwave emission is observed for both current polarizations where a redshift is seen with increase in magnitude of current. We discuss spin-dynamics of the observed bi-directional high-frequency emission and the physical origin of the red-shift. The distinct microwave emission properties exhibited in this tri-layer MTJ structure could potentially be useful for future applications in nanoscale spintronics devices such as microwave communication and neuromorphic computing.
