Terahertz frequency spectrum analysis with a nanoscale antiferromagnetic tunnel junction

Abstract

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 experiment, will allow miniaturized electronics to rapidly analyze low power signals with a simple algorithm. It is also found by simulation and analytical theory 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.

arXiv comment10 pages, 5 figures, submitted to the Journal of Applied Physics

References in corpus (10)

• Antiferromagnetic spintronics
• Antiferromagnetic spintronics
• Electrical switching of an antiferromagnet
• Scaling of spin Hall angle in 3d, 4d and 5d metals from Y3Fe5O12/metal spin pumping
• Spin pumping and spin-transfer torques in antiferromagnets
• Spin transfer and current-induced switching in antiferromagnets
• Terahertz Antiferromagnetic Spin Hall Nano-Oscillator
• Dependence of Giant Tunnel Magnetoresistance of Sputtered CoFeB/MgO/CoFeB Magnetic Tunnel Junctions on MgO Barrier Thickness and Annealing Temperatur
• Multiple-stable anisotropic magnetoresistance memory in antiferromagnetic MnTe
• THz-Frequency Spin-Hall Auto-Oscillator Based on a Canted Antiferromagnet

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• Spin-Torque-driven Terahertz Auto Oscillations in Non-Collinear Coplanar Antiferromagnets
• Antiferromagnetic helix as an efficient spin polarizer: Interplay between electric field and higher ordered hopping
• Thermoelectric phenomena in an antiferromagnetic helix: Role of electric field
• Strongly nonlinear antiferromagnetic dynamics in high magnetic fields