Power and linewidth of propagating and localized modes in nanocontact spin-torque oscillators

Abstract

Integrated power and linewidth of a propagating and a self-localized spin wave modes excited by spin-polarized current in an obliquely magnetized magnetic nanocontact are studied experimentally as functions of the angle ${\theta }_e$ between the external bias magnetic field and the nanocontact plane. It is found that the power of the propagating mode monotonically increases with ${\theta }_e$, while the power of the self-localized mode has a broad maximum near ${\theta }_e=40$ deg, and exponentially vanishes near the critical angle ${\theta }_e=58$ deg, at which the localized mode disappears. The linewidth of the propagating mode in the interval of angles $58<{\theta }_e<90$ deg, where only this mode is excited, is adequtely described by the existing theory, while in the angular interval where both modes can exist the observed linewidth of both modes is substantially broadened due to the telegraph switching between the modes. Numetical simulations and an approximate analytical model give good semi-quantitative description of the observed results.

8 pages, 6 figures

References in corpus (7)

• Bias-driven large power microwave emission from MgO-based tunnel magnetoresistance devices
• Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
• Large-amplitude coherent spin waves exited by spin-polarized current in nanoscale spin valves
• Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle
• Decoherence and mode-hopping in a magnetic tunnel junction-based spin-torque oscillator
• Micromagnetic study of a spin-torque oscillator based on a magnetic nano-contact magnetized at an arbitrary angle
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