Sub-terahertz Frequency Signal Source Based on an Array of Antiferromagnetic Tunnel Junctions

It has been shown recently that an antiferromagnetic tunnel junction (ATJ) embedded in a high-Q dielectric resonator can operate as a (sub-)terahertz- frequency AC signal source having AC power exceeding that of 1Although the benefits of ATJs as core generating elements were analyzed before, the proposed sources have one critical bottleneck: they are based on one junction only and thus have output AC powers less than 1 - 10 which can be insufficient for some applications. To overcome this limit, in this paper, we consider an array of several independent ATJs placed at some “optimum places” inside the resonator, which could provide a substantial increase in the power generated by the source. Using a simple electrical model for the case of independent ATJs connected to the dielectric resonator, where each ATJ is considered as an equivalent RLC circuit, we estimate the output AC power PAC of the source based on independent ATJs placed inside a high-Q dielectric resonator. We found that the use of only three ATJs allows one to increase the frequency-dependent source's output power up to 1–20 in the 0.1-1 THz frequency range. The obtained results can be useful for the development and optimization of (sub-)terahertz-frequency signal sources based on antiferromagnetic spintronic nanostructures.