正矩形脉冲信号的自旋扭矩微波探测器
Spin-torque microwave detectors of positive rectangular pulse signals
浏览论文内容
中文总结 AI 辅助
该研究分析了正矩形脉冲驱动的自旋扭矩微波探测器的两种运行状态，发现线性状态可用于明确检测输入脉冲参数，对非谐波微波信号处理的自旋电子器件开发有重要意义。
中文摘要 AI 辅助
我们分析了由不同振幅I₀、持续时间τ和重复周期T的正矩形电流脉冲I(t)驱动的自旋扭矩微波探测器（STMD）的性能，揭示了STMD运行的两种不同状态。在第一种（线性）状态下，探测器两端的时间平均电压U_dc随脉冲振幅I₀线性变化，且取决于τ/T的比值，即U_dc ∝ I₀(τ/T)。该状态在面内（IP）磁化动力学的情况下，于宽范围的脉冲振幅I₀中均可观测；而在具有面外（OOP）磁化动力学的STMD中，仅在脉冲振幅I₀≤I_th时可观测。另一种（非线性）状态的特征是电压跳变与下降，仅在具有OOP磁化动力学的结构中，针对短重复周期、大振幅I₀≥I_th的输入脉冲可观测。我们认为，STMD运行的线性状态可用于明确检测输入脉冲参数，这对开发和优化能够检测并处理非谐波（如数字）微波信号的自旋电子器件具有重要意义。
英文摘要
We analyze the performance of a spin-torque microwave detector (STMD) driven by positive rectangular current pulses $I(t)$ of various amplitudes $I_0$, durations $τ$, and repetition periods $T$ and reveal two distinct regimes of STMD operation. In the first (linear) regime, the time-averaged voltage across the detector, $U_{\rm dc}$, changes linearly with the pulse amplitude $I_0$ and depends on the ratio $τ/T$: $U_{\rm dc} \sim I_0 (τ/T)$. This regime is observed for a wide range of pulse amplitudes $I_0$ in the case of in-plane (IP) magnetization dynamics and for rather small pulse amplitudes $I_0 \le I_{\rm th}$ in an STMD with out-of-plane (OOP) magnetization dynamics. The other (nonlinear) regime is characterized by voltage jumps and drops and is observed only in a structure with OOP magnetization dynamics for input pulses with short repetition periods and large amplitudes $I_0 \ge I_{\rm th}$. We believe that the linear regime of STMD operation can be used to unambiguously detect input pulse parameters, which could be important for the development and optimization of spintronic devices capable of detecting and processing non-harmonic (e.g., digital) microwave signals.
