Terahertz frequency spectrum analysis with a nanoscale antiferromagnetic tunnel junction
Terahertz frequency spectrum analysis with a nanoscale antiferromagnetic tunnel junction
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DOI：
10.1063/1.5140552
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发表时间：
2020-02-14
影响因子：
3.2
通讯作者：
Prokopenko, O. V.
中科院分区：
文献类型：
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作者：
Artemchuk, P. Yu.;Sulymenko, O. R.;Prokopenko, O. V.
提出了一种对0.1 ~ 10 THz的低功率信号进行频谱分析的方法。它利用纳米级反铁磁隧道结（ATJ），产生振荡的隧穿各向异性磁阻，其频率取决于倏逝自旋电流的大小。它首先表明，ATJ振荡频率可以随时间线性调谐。然后，研究表明ATJ输出高度依赖于匹配条件，而匹配条件高度依赖于电介质隧道势垒的尺寸。频谱分析可以通过使用适当设计的ATJ、低通滤波器和匹配滤波器来执行，ATJ的频率被驱动为随时间线性增加。这种太赫兹频谱分析方法，如果在实验中实现，将允许小型化的电子设备快速分析低功率信号与一个简单的算法。通过仿真和分析理论还发现，对于具有0.09 μ m（2）足迹的ATJ，可以在0：25 THz带宽上仅在25 ns内对处于Johnson-Nyquist热噪声基底的信号进行频谱分析。由AIP Publishing授权出版。
A method to perform spectrum analysis on low power signals between 0.1 and 10 THz is proposed. It utilizes a nanoscale antiferromagnetic tunnel junction (ATJ) that produces an oscillating tunneling anisotropic magnetoresistance, whose frequency is dependent on the magnitude of an evanescent spin current. It is first shown that the ATJ oscillation frequency can be tuned linearly with time. Then, it is shown that the ATJ output is highly dependent on matching conditions that are highly dependent on the dimensions of the dielectric tunneling barrier. Spectrum analysis can be performed by using an appropriately designed ATJ, whose frequency is driven to increase linearly with time, a low pass filter, and a matched filter. This method of THz spectrum analysis, if realized in the experiment, will allow miniaturized electronics to rapidly analyze low power signals with a simple algorithm. It is also found by simulation and analytical theories that for an ATJ with a 0.09 mu m(2) footprint, spectrum analysis can be performed over a 0:25 THz bandwidth in just 25 ns on signals that are at the Johnson-Nyquist thermal noise floor. Published under license by AIP Publishing.