Confined dissipative droplet solitons in spin-valve nanowires with perpendicular magnetic anisotropy

TL;DR

This paper investigates the existence and behavior of confined dissipative droplet solitons in spin-valve nanowires with perpendicular magnetic anisotropy, revealing mode transitions as the nanowire width decreases.

Contribution

It introduces the first analysis of dissipative droplet solitons in confined nanostructures, demonstrating mode transitions and providing analytical descriptions.

Findings

Modes transition from 2D droplet to edge mode to 1D pulsating droplet with decreasing width.

Analytical framework for dissipative solitons in confined geometries.

Potential applications in nanoscale magnetic storage and computation.

Abstract

Magnetic dissipative droplets are localized, strongly nonlinear dynamical modes excited in nano-contact spin valves with perpendicular magnetic anisotropy. These modes find potential application in nanoscale structures for magnetic storage and computation, but dissipative droplet studies have so far been limited to extended thin films. Here, numerical and asymptotic analyses are used to demonstrate the existence and properties of novel solitons in confined structures. As a nanowire's width is decreased with a nano-contact of fixed size at its center, the observed modes undergo transitions from a fully localized two-dimensional droplet into a two-dimensional droplet edge mode and then a pulsating one-dimensional droplet. These solitons are interpreted as dissipative versions of classical, conservative solitons, allowing for an analytical description of the modes and the mechanisms of bifurcation. The presented results open up new possibilities for the study of low-dimensional solitons and droplet applications in nanostructures.