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Confined Dissipative Droplet Solitons in Spin-Valve Nanowires with Perpendicular Magnetic Anisotropy

Journal article
Authors Ezio Iacocca
Randy K. Dumas
L. Bookman
M. Mohseni
Sunjae Chung
M. A. Hoefer
Johan Åkerman
Published in Physical Review Letters
Volume 112
Issue 4
ISSN 0031-9007
Publication year 2014
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1103/PhysRevLett.112....
Keywords DOMAIN-WALL MOTION, ELECTRIC-CURRENT, POLARIZED CURRENT, NANO-OSCILLATORS, DRIVEN, TORQUE, EXCITATION, WAVES, MULTILAYER, LOGIC
Subject categories Physical Sciences

Abstract

Magnetic dissipative droplets are localized, strongly nonlinear dynamical modes excited in nanocontact 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 nanocontact 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.

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