Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle

Abstract

We measure the microwave signals produced by spin-torque-driven magnetization dynamics in patterned magnetic multilayer devices at room temperature, as a function of the angle of a magnetic field applied in the sample plane. We find strong variations in the frequency linewidth of the signals, with a decrease by more than a factor of 20 as the field is rotated from the magnetic easy axis to the in-plane hard axis. Based on micromagnetic simulations, we identify these variations as due to a transition from spatially incoherent to coherent precession.

15 pages, 5 figures

References in corpus (4)

• Spin-transfer-driven ferromagnetic resonance of individual nanomagnets
• Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
• Current-driven microwave oscillations in current perpendicular-to-plane spin-valve nanopillars
• Stochastic theory of spin-transfer oscillator linewidths

Cited by in corpus (4)

• Temperature dependence of nonlinear auto-oscillator linewidths: Application to spin-torque nano-oscillators
• Spin-Torque-Induced Rotational Dynamics of a Magnetic Vortex Dipole
• Non-stationary magnetization dynamics driven by spin transfer torque
• Micromagnetic simulations of persistent oscillatory modes excited by spin-polarized current in nanoscale exchange-biased spin valves