| 1. |
- Artemchuk, P. Y., et al.
(författare)
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Terahertz frequency spectrum analysis with a nanoscale antiferromagnetic tunnel junction
- 2020
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 127:6
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Tidskriftsartikel (refereegranskat)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 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.
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| 2. |
- Louis, S., et al.
(författare)
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Low Power Microwave Signal Detection With a Spin-Torque Nano-Oscillator in the Active Self-Oscillating Regime
- 2017
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Ingår i: Ieee Transactions on Magnetics. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9464 .- 1941-0069. ; 53:11
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Tidskriftsartikel (refereegranskat)abstract
- A spin-torque nano-oscillator (STNO) driven by a ramped bias current can perform spectrum analysis quickly over a wide frequency bandwidth. The STNO spectrum analyzer operates by injection locking to external microwave signals and produces an output dc voltage V-dc that temporally encodes the input spectrum. We found, via numerical analysis with a macrospin approximation, that an STNO is able to scan a 10 GHz bandwidth in less than 100 ns (scanning rate R exceeds 100 MHz/ns). In contrast to conventional quadratic microwave detectors, the output voltage of the STNO analyzer is proportional to the amplitude of the input microwave signal I-rf with sensitivity S = dV(dc)/d I-rf approximate to 750 mV/mA. The minimum detectable signal of the analyzer depends on the scanning rate R and, at low R approximate to 1 MHz/ns, is about 1 pW.
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