论文标题
通过DC驱动的Spintronic纳米元素同时进行多电极微波排放
Simultaneous multitone microwave emission by DC-driven spintronic nano-element
论文作者
论文摘要
电流引起的自旋刺激纳米振荡器（STNOS）的自维持磁化振荡是超级敏捷微波源或检测器的有前途的候选者。虽然STNOS通常作为单色源行为，但我们在这里报告了不固定的微波振荡的清晰双峰同时发射，其中两个音调对应于两个参数耦合的特征模量，并具有可调式分裂。发射范围对自由和固定层的本征模的杂交变化（例如，通过纳米柱正常的施加磁场的轻微倾斜）至关重要。我们的实验发现在分析和微磁模拟方面都得到了支持，这些模拟将过程归因于一对径向对称的镁模式和一对具有相反无方质指数的磁蛋白模式之间的四麦克农散射。我们的发现为认知电信和神经形态系统开辟了新的可能性，这些系统使用频率多路复用来改善沟通性能。
Current-induced self-sustained magnetization oscillations in spin-torque nano-oscillators (STNOs) are promising candidates for ultra-agile microwave sources or detectors. While usually STNOs behave as a monochrome source, we report here clear bimodal simultaneous emission of incommensurate microwave oscillations, where the two tones correspond to two parametrically coupled eigenmodes with tunable splitting. The emission range is crucially sensitive to the change in hybridization of the eigenmodes of free and fixed layers, for instance, through a slight tilt of the applied magnetic field from the normal of the nano-pillar. Our experimental findings are supported both analytically and by micromagnetic simulations, which ascribe the process to four-magnon scattering between a pair of radially symmetric magnon modes and a pair of magnon modes with opposite azimuthal index. Our findings open up new possibilities for cognitive telecommunications and neuromorphic systems that use frequency multiplexing to improve communication performance.
