Chiral excitations of magnetic droplet solitons driven by their own inertia

TL;DR

This paper investigates the inertial effects of magnetic droplet solitons, revealing their chiral excitations and demonstrating control methods via current and magnetic field, which is crucial for their application in devices.

Contribution

It introduces the concept of chiral excitations in magnetic droplet solitons driven by inertia and shows how to control these modes using current and magnetic field.

Findings

Magnetic droplets exhibit a second excitation mode with a chiral profile.

The chiral excitations are induced by the droplet's inertia resisting the Oersted field.

Control of these modes is achieved through manipulation of current and magnetic field.

Abstract

The inertial effects of magnetic solitons play a crucial role in their dynamics and stability. Yet governing their inertial effects is a challenge for their use in real devices. Here, we show how to control the inertial effects of magnetic droplet solitons. Magnetic droplets are strongly nonlinear and localized autosolitons than can form in current-driven nanocontacts. Droplets can be considered as dynamical particles with an effective mass. We show that the dynamical droplet bears a second excitation under its own inertia. These excitations comprise a chiral profile, and appear when the droplet resists the force induced by the Oersted field of the current injected into the nanocontact. We reveal the role of the spin torque on the excitation of these chiral modes and we show how to control these modes using the current and the field.