论文标题
无现场的高频交换弹簧旋转纳米振荡器
Field-free high-frequency exchange-spring spin-torque nano-oscillators
论文作者
论文摘要
自旋扭转纳米振荡器（STNOS）是一种利用自旋弯曲的纳米级微波自动振荡器，可以生成磁力动力学，并有很大的希望在微波，磁记忆和神经形态计算中施用。在这里，我们报告了交换 - 弹簧STNO的首次演示，其中具有Exchange-spring（[CO/PD] -CO）参考层和垂直（[CO/NI]）游离层。这种磁性构型在参考层中的零磁场和交换弹簧动力学上产生高频（> 10 GHz）的微波发射，并在不同电流极性下自由层中的磁滴孤子观察。我们展示了基于双极和无现场的基于双极交换的STNO在20 GHz频率范围内运行的STNO极大地扩展了当前STNO技术的设计自由度和功能，用于节能高频播种机和神经形态应用。
Spin-torque nano-oscillators (STNOs) are a type of nanoscale microwave auto-oscillators utilizing spin-torque to generate magnetodynamics with great promise for applications in microwaves, magnetic memory, and neuromorphic computing. Here, we report the first demonstration of exchange-spring STNOs, with an exchange-spring ([Co/Pd]-Co) reference layer and a perpendicular ([Co/Ni]) free layer. This magnetic configuration results in high-frequency (>10 GHz) microwave emission at a zero magnetic field and exchange-spring dynamics in the reference layer and the observation of magnetic droplet solitons in the free layer at different current polarities. Our demonstration of bipolar and field-free exchange-spring-based STNOs operating over a 20 GHz frequency range greatly extends the design freedom and functionality of the current STNO technology for energy-efficient high-frequency spintronic and neuromorphic applications.
