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arXiv · 1704.03585

Low Power Microwave Signal Detection With a Spin-Torque Nano-Oscillator in the Active Self-Oscillating Regime

Steven Louis·Vasyl Tyberkevych·Jia Li·Ivan Lisenkov·Roman Khymyn·Elena Bankowski·Thomas Meitzler·Ilya Krivorotov·Andrei Slavin
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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 $V_{\rm dc}$ that temporally encodes the input spectrum. We found, via numerical analysis with a macrospin approximation, that an STNO is able to scan a $10~\rm GHz$ bandwidth in less than $100~\rm ns$ (scanning rate $R$ exceeds $100~\rm MHz/ns$). In contrast to conventional quadratic microwave detectors, the output voltage of the STNO analyzer is proportional to the amplitude of the input microwave signal $I_{\rm rf}$ with sensitivity $S = dV_{\rm dc}/dI_{\rm rf} \approx 750~\rm mV/mA$. The minimum detectable signal of the analyzer depends on the scanning rate $R$ and, at low $R \approx 1~\rm MHz/ns$, is about $1~\rm pW$.

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Steven Louis, Vasyl Tyberkevych, Jia Li, Ivan Lisenkov, Roman Khymyn, Elena Bankowski, Thomas Meitzler, Ilya Krivorotov, Andrei Slavin. 2017-04-12. Low Power Microwave Signal Detection With a Spin-Torque Nano-Oscillator in the Active Self-Oscillating Regime. https://doi.org/10.1109/tmag.2017.2694847

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