High rectification sensitivity of radiofrequency signal through adiabatic stochastic resonance in nanoscale magnetic tunnel junctions
High rectification sensitivity of radiofrequency signal through adiabatic stochastic resonance in nanoscale magnetic tunnel junctions
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DOI：
10.1063/1.5123466
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发表时间：
2019-11-04
影响因子：
4
通讯作者：
Waks, E.
中科院分区：
文献类型：
--
作者：
Algarin, J. M.;Ramaswamy, B.;Waks, E.
整流是用于任何无线射频功率传输应用的电子电路中的重要阶段。目前，肖特基二极管被广泛用作整流器;然而，它们在微瓦或更低的低功率水平下效率低下（提供约4 mV/mu W的最大灵敏度）。纳米级磁性隧道结可以利用所谓的自旋扭矩二极管效应作为替代整流器，与肖特基二极管相比，具有更高的整流灵敏度（200 mV/μ W）。然而，为了使这种机制工作，信号频率必须与铁磁共振频率相匹配，铁磁共振频率通常在千兆赫范围内。对于兆赫范围或更低的信号，肖特基二极管仍然是整流的唯一选择。在这里，我们展示了一种机制的基础上热激活绝热随机共振在磁隧道结产生低频（高达几十兆赫）信号整流在低输入功率（亚微瓦），高达35 mV/μ W的灵敏度高于国家的最先进的肖特基二极管整流器在这个频率和功率范围。这些研究结果表明，磁性隧道结作为潜在的替代肖特基二极管的低频和低功耗应用。
Rectification is an important stage in electronic circuits for any wireless radio frequency power transfer application. Currently, Schottky diodes are widely used as rectifiers; however, they are inefficient at low power levels of microwatts or less (providing maximum sensitivities around 4 mV/mu W). Nanoscale magnetic tunnel junctions can serve as alternative rectifiers by utilizing the so-called spin-torque diode effect, demonstrating a much higher rectification sensitivity (200 mV/mu W) compared to Schottky diodes. However, for this mechanism to work, the signal frequency must match the ferromagnetic resonance frequency, which typically lies in the gigahertz range. For signals in the megahertz range or lower, Schottky diodes remain the only option for rectification. Here, we demonstrate a mechanism based on thermally activated adiabatic stochastic resonance in magnetic tunnel junctions to produce low frequency (up to tens of megahertz) signal rectification at low input power (submicrowatt), with a sensitivity of up to 35 mV/mu W-higher than state-of-the-art Schottky diode rectifiers at this frequency and power range. These findings suggest magnetic tunnel junctions as potential alternatives to Schottky diodes for low frequency and low power applications.