Magnetic droplet solitons generated by pure spin currents

TL;DR

This paper demonstrates that magnetic droplet solitons can be generated and sustained by pure spin currents in nanoconstriction-based devices, expanding their potential for spintronic information transmission.

Contribution

It introduces a new method to generate magnetic droplets using pure spin currents, not just spin-polarized electrical currents, with experimental and simulation support.

Findings

Magnetic droplets can be nucleated by pure spin currents.

Propagating solitons can be generated in the system.

Potential for spintronic information transmission.

Abstract

Magnetic droplets are dynamical solitons that can be generated by locally suppressing the dynamical damping in magnetic films with perpendicular anisotropy. To date, droplets have been observed only in nanocontact spin-torque oscillators operated by spin-polarized electrical currents. Here, we experimentally demonstrate that magnetic droplets can be nucleated and sustained by pure spin currents in nanoconstriction-based spin Hall devices. Micromagnetic simulations support our interpretation of the data, and indicate that in addition to the stationary droplets, propagating solitons can be also generated in the studied system, which can be utilized for the information transmission in spintronic applications.