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

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.

References in corpus (9)

• Spin Transfer Torques
• Current-driven dynamics of chiral ferromagnetic domain walls
• Current-driven vortex oscillations in metallic nanocontacts
• Theory for a dissipative droplet soliton excited by a spin torque nanocontact
• High domain wall velocities due to spin currents perpendicular to the plane
• Spin wave mode coexistence on the nano-scale: A consequence of the Oersted field induced asymmetric energy landscape
• Propagation and control of nano-scale, magnetic droplet solitons
• Power and linewidth of propagating and localized modes in nanocontact spin-torque oscillators
• Propagating two-dimensional magnetic droplets

Cited by in corpus (19)

• Parametric Auto-Excitation of Magnetic Droplet Soliton Perimeter Modes
• Merging droplets in double nano-contact spin torque oscillators
• Magnetic lump motion in saturated ferromagnetic films
• Spin-Hall nanooscillator based on an antiferromagnetic domain wall
• Magnetic droplet solitons generated by pure spin currents
• Attraction, Merger, Reflection, and Annihilation in Magnetic Droplet Soliton Scattering
• Symmetry-broken dissipative exchange flows in thin-film ferromagnets with in-plane anisotropy
• Effects of thermal perturbations on magnetic dissipative droplet solitons
• Magnetic Droplet Soliton Nucleation in Oblique Fields
• Paving Spin-Wave Fibers in Magnonic Nanocircuits Using Spin-Orbit Torque
• Perturbation Theory for Propagating Magnetic Droplet Solitons
• Effective Generation of Closed-form Soliton Solutions of the Continuous Classical Heisenberg Ferromagnet Equation
• Freezing and thawing magnetic droplet solitons
• Experimental and Numerical Understanding of Localized Spin Wave Mode Behavior in Broadly Tunable Spatially Complex Magnetic Configurations
• Nonlinear dynamics of topological ferromagnetic textures for frequency multiplication
• Vortex-antivortex proliferation from an obstacle in thin film ferromagnets
• Thermal Activation Barriers for Creation and Annihilation of Magnetic Droplet Solitons in the Presence of Spin Transfer Torque
• Transverse instabilities of stripe domains in magnetic thin films with perpendicular magnetic anisotropy
• Dynamical magnetic skyrmions