Linewidth of Power Spectrum Originated from Thermal Noise in Spin Torque Oscillator

Abstract

A theoretical formula of the linewidth caused by the thermal activation in a spin torque oscillator with a perpendicularly magnetized free layer and an in-plane magnetized pinned layer was developed by solving the stochastic Landau-Lifshitz-Gilbert equation in the energy-phase representation. It is shown that the linewidth can be suppressed down to 0.1 MHz by applying a large current (10 mA for typical material parameters). A quality factor larger than 10^{4} is predicted in the large current limit, which is two orders of magnitude larger than the recently observed experimental value.

5 pages, 2 figures

References in corpus (4)

• Bias-driven large power microwave emission from MgO-based tunnel magnetoresistance devices
• Spin-torque switching: Fokker-Planck rate calculation
• Current-driven microwave oscillations in current perpendicular-to-plane spin-valve nanopillars
• Spin torque switching of an in-plane magnetized system in a thermally activated region

Cited by in corpus (4)

• Spin Torque Oscillators with Thermal Noise: A Constant Energy Orbit Approach
• Nonlinear analysis of magnetization dynamics excited by spin Hall effect
• Dynamic coupling of ferromagnets via spin Hall magnetoresistance
• Large amplitude oscillation of magnetization in spin-torque oscillator stabilized by field-like torque