自旋转移矩激发自旋阀纳米柱中两个耦合涡旋的动力学行为
Dynamics of two coupled vortices in a spin valve nanopillar excited by spin transfer torque
摘要：
我们研究了由自旋转移驱动的两个耦合涡旋的动力学。我们能够独立地控制与电流和垂直场，并检测，各自的手征性和极性的两个漩涡。对于高于$J=5.7*10^7 A/cm^2$的电流密度，可以观察到高度相干的信号（线宽低至46 kHz），其强烈依赖于涡旋的相对极性。它展示了使用耦合动力学的兴趣，以增加微波信号的相干性。辐射频率随垂直场呈线性变化，即使在零磁场下也保持相干性。
英文摘要：
We investigate the dynamics of two coupled vortices driven by spin transfer. We are able to independently control with current and perpendicular field, and to detect, the respective chiralities and polarities of the two vortices. For current densities above $J=5.7*10^7 A/cm^2$, a highly coherent signal (linewidth down to 46 kHz) can be observed, with a strong dependence on the relative polarities of the vortices. It demonstrates the interest of using coupled dynamics in order to increase the coherence of the microwave signal. Emissions exhibit a linear frequency evolution with perpendicular field, with coherence conserved even at zero magnetic field.
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