Micromagnetic Study of Spin-Torque Nano-oscillators Dipolar-Coupled with a Perpendicular Magnetized Layer

摘要

We studied the frequency and linewidth of a spin torque nano-oscillator dipolar-coupled with a perpendicular magnetized layer by micromagnetic simulations. The results show that the non-uniform stray field will break the quasi-uniform precession mode which leads to the reduction of operable current range and broadening the linewidth at T=0 K. However, at T=300 K, under small current amplitude the thermal noise was reduced by the feedback from the coupled magnetic layer and thus reduce the linewidth.