Experimental demonstration of a rapid sweep-tuned spectrum analyzer with temporal resolution based on a spin-torque nano-oscillator

Abstract

It is demonstrated experimentally that a spin-torque nano-oscillator (STNO) rapidly sweep-tuned by a bias voltage can be used for time-resolved spectrum analysis of frequency-manipulated microwave signals with complicated multi-tone spectra. The critical reduction in the time of spectrum analysis comes from the naturally small time constants of a nano-sized STNO (1-100 ns). The demonstration is performed on a vortex-state STNO generating in a frequency range around 300 MHz, with frequency down-conversion and matched filtering used for signal processing. It is shown that this STNO-based spectrum analyzer can perform analysis of multi-tone signals, and signals with rapidly changing frequency components with time resolution on a $\mu$s time scale and frequency resolution limited only by the 'bandwidth' theorem. The proposed concept of rapid time-resolved spectrum analysis can be implemented with any type of micro and nano-scale frequency-swept oscillators having low time constants and high oscillation frequency.

References in corpus (10)

• Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
• Frequency Modulation of Spin-Transfer Oscillators
• Agility of vortex-based nanocontact spin torque oscillators
• Faster, farther, stronger: spin transfer torque driven high order propagating spin waves in nano-contact magnetic tunnel junctions
• Understanding of phase noise squeezing under fractional synchronization of non-linear spin transfer vortex oscillator
• Non-white frequency noise in spin torque oscillators and its effect on spectral linewidth
• Oscillatory transient regime in the forced dynamics of a spin torque nano-oscillator
• Direct experimental measurement of phase-amplitude coupling in spin torque oscillators
• Frequency shift keying by current modulation in a MTJ-based STNO with high data rate
• Low offset frequency $1/f$ flicker noise in spin torque vortex oscillators

Cited by in corpus (11)

• Robust mutual synchronization in long spin Hall nano-oscillator chains
• Hardware realization of the multiply and accumulate operation on radio-frequency signals with magnetic tunnel junctions
• Radio-Frequency Multiply-And-Accumulate Operations with Spintronic Synapses
• Analog and digital phase modulation of spin torque nano-oscillators
• Ultra-fast GHz-range swept-tuned spectrum analyzer with 20 ns temporal resolution based on a spin-torque nano-oscillator with a uniformly magnetized 'free' layer
• Field-free high-frequency exchange-spring spin-torque nano-oscillators
• Phase noise analysis of mutually synchronized spin Hall nano-oscillators
• Large Non-Volatile Frequency Tuning of Spin Hall Nano-Oscillators using Circular Memristive Nano-Gates
• Stress-induced modification of gyration dynamics in stacked double-vortex structures studied by micromagnetic simulations
• Mutual synchronization in spin torque and spin Hall nano-oscillators
• Flicker and random telegraph noise between gyrotropic and dynamic C-state of a vortex based spin torque nano oscillator