Low offset frequency flicker noise in spin torque vortex oscillators
arXiv:1906.10190 · doi:10.1103/PhysRevB.99.235135
Abstract
Low frequency noise close to the carrier remains little explored in spin torque nano oscillators. However, it is crucial to investigate as it limits the oscillator's frequency stability. This work addresses the low offset frequency flicker noise of a TMR-based spin-torque vortex oscillator in the regime of large amplitude steady oscillations. We first phenomenologically expand the nonlinear auto-oscillator theory aiming to reveal the properties of this noise. We then present a thorough experimental study of the oscillator's flicker noise and discuss the results based on the theoretical predictions. Hereby, we connect the oscillator's nonlinear dynamics with the concept of flicker noise and furthermore refer to the influence of a standard noise description based on the Hooge formula, taking into account the non-constant magnetic oscillation volume, which contributes to the magnetoresistance.
10 pages
References in corpus (22)
- Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current
- Spin torque building blocks
- Vowel recognition with four coupled spin-torque nano-oscillators
- Large microwave generation from d.c. driven magnetic vortex oscillators in magnetic tunnel junctions
- Low Frequency Electronic Noise in Single-Layer MoS2 Transistors
- Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
- Spin Hall Angle Quantification from Spin Pumping and Microwave Photoresistance
- Mutual synchronization of spin torque nano-oscillators through a non-local and tunable electrical coupling
- Spin torque resonant vortex core expulsion for an efficient radio-frequency detection scheme
- Microwave power generated by a spin-torque oscillator in the presence of noise
- Understanding of phase noise squeezing under fractional synchronization of non-linear spin transfer vortex oscillator
- Origin of the spectral linewidth in non linear oscillators based on MgO tunnel junctions
- Non-white frequency noise in spin torque oscillators and its effect on spectral linewidth
- Perfect and robust phase-locking of a spin transfer vortex nano-oscillator to an external microwave source
- Very low 1/f noise at room temperature in fully epitaxial Fe/MgO/Fe magnetic tunnel junctions
- Direct experimental measurement of phase-amplitude coupling in spin torque oscillators
- Amplitude-Phase Coupling in a Spin-Torque Nano-Oscillator
- Strongly suppressed 1/f noise and enhanced magnetoresistance in epitaxial Fe-V/MgO/Fe magnetic tunnel junctions
- Low Power Microwave Signal Detection With a Spin-Torque Nano-Oscillator in the Active Self-Oscillating Regime
- Spintronic nano-scale harvester of broadband microwave energy
- Low frequency noise due to magnetic inhomogeneities in submicron FeCoB/MgO/FeCoB magnetic tunnel junctions
- Low offset frequency flicker noise in spin torque vortex oscillators
Cited by in corpus (7)
- Experimental demonstration of a rapid sweep-tuned spectrum analyzer with temporal resolution based on a spin-torque nano-oscillator
- Spin-torque Dynamics for Noise Reduction in Vortex-based Sensors
- Low offset frequency flicker noise in spin torque vortex oscillators
- Beyond the gyrotropic motion: dynamic C-state in vortex spin torque oscillators
- Phase noise analysis of mutually synchronized spin Hall nano-oscillators
- Influence of flicker noise and nonlinearity on the frequency spectrum of spin torque nano-oscillators
- Flicker and random telegraph noise between gyrotropic and dynamic C-state of a vortex based spin torque nano oscillator