An important property of spin-torque nano-oscillators (STNOs) is their ability to produce a frequency modulated (FM) signal, which is very critical for communication applications. We here demonstrate a novel single sideband (SSB) modulation phenomenon using a magnetic tunnel junction (MTJ)-based STNO, which saves transmission bandwidth and in principle should minimize attenuation for wireless communication. Experimentally, lower single sidebands (LSSBs) have been successfully demonstrated over a wide range of modulation frequency, f m = 150 MHz-1 GHz. The observed LSSBs are determined by the intrinsic properties of the device, which can be modeled well by a nonlinear frequency and amplitude modulation formulation and reproduced in macrospin simulations. Moreover, our macrospin simulation results show that the range of modulation current and modulation frequency for generating SSBs can be controlled by the field-like torque and biasing conditions.
展开▼
机译：自旋扭矩纳米振荡器（STNO）的重要特性是其产生调频（FM）信号的能力，这对于通信应用至关重要。我们在这里演示了使用基于磁隧道结（MTJ）的STNO的新型单边带（SSB）调制现象，该现象可节省传输带宽，并且原则上应将无线通信的衰减降至最低。在实验上，较低的单边带（LSSB）在调制频率f m = 150 MHz-1 GHz的宽范围内已得到成功证明。观察到的LSSB由设备的固有属性确定，可以通过非线性频率和幅度调制公式很好地建模并在macrospin仿真中复制。此外，我们的宏自旋仿真结果表明，用于产生SSB的调制电流和调制频率的范围可以通过类似磁场的转矩和偏置条件来控制。
展开▼
