Effect of temperature on spin-transfer torque induced magnetic solitons

TL;DR

This study investigates how temperature affects the formation and stability of spin-transfer torque-induced magnetic droplet solitons, revealing that higher temperatures require more current for nucleation and increase instability.

Contribution

It provides the first experimental analysis of temperature effects on droplet soliton thresholds and dynamics in magnetic nanocontacts.

Findings

Higher temperature increases the current needed for droplet nucleation.

Temperature elevates the instability and noise in droplet dynamics.

Thermal effects are crucial for controlling magnetic droplet solitons.

Abstract

Spin-transfer torques in a nanocontact to an extended magnetic film can create spin waves that condense to form dissipative droplet solitons. Here we report an experimental study of the temperature dependence of the current and applied field thresholds for droplet soliton formation, as well as the nanocontact's electrical characteristics associated with droplet dynamics. Nucleation of droplet solitons requires higher current densities at higher temperatures, in contrast to typical spin-transfer torque induced switching between static magnetic states. Magnetoresistance and electrical noise measurements show that soliton instabilities become more pronounced with increasing temperature. These results are of fundamental interest in understanding the influence of thermal noise on droplet solitons, and in controlling their dynamics.