Spin-wave focusing induced skyrmion generation
arXiv:2009.08091 · doi:10.1063/5.0029401
Abstract
We propose a new method to generate magnetic skyrmions through spin-wave focusing in chiral ferromagnets.A lens is constructed to focus spin waves by a curved interface between two ferromagnetic thin films with different perpendicular magnetic anisotropies. Based on the principle of identical magnonic path length, we derive the lens contour that can be either elliptical or hyperbolical depending on the magnon refractive index. Micromagnetic simulations are performed to verify the theoretical design. It is found that under proper condition magnetic skyrmions emerge near the focus point of the lens where the spin-wave intensity has been significantly enhanced. A close investigation shows that a magnetic droplet first forms and then converts to the skyrmion accompanying with a change of topological charge. Phase diagram about the amplitude and duration-time of the exciting field for skyrmion generation is obtained. Our findings would be helpful for designing novel spintronic devices combining the advantages of skyrmionics and magnonics.
5 pages, 4 figures
References in corpus (32)
- The design and verification of Mumax3
- The building blocks of magnonics
- Current-induced skyrmion dynamics in constricted geometries
- Magnetic skyrmion logic gates: conversion, duplication and merging of skyrmions
- Realization of XNOR and NAND spin-wave logic gates
- Skyrmion-electronics: Writing, deleting, reading and processing magnetic skyrmions toward spintronic applications
- A reversible conversion between a skyrmion and a domain-wall pair in junction geometry
- Field-free deterministic ultra fast creation of skyrmions by spin orbit torques
- Magnon-skyrmion scattering in chiral magnets
- Skyrmion dynamics in a frustrated ferromagnetic film and current-induced helicity locking-unlocking transition
- Ultra-low damping insulating magnetic thin films get perpendicular
- Theory of magnon-skyrmion scattering in chiral magnets
- Theory for a dissipative droplet soliton excited by a spin torque nanocontact
- Deterministic creation and deletion of a single magnetic skyrmion observed by direct time-resolved X-ray microscopy
- Large-amplitude coherent spin waves exited by spin-polarized current in nanoscale spin valves
- Magnetochiral symmetry breaking in a Möbius ring
- Skyrmion production on demand by homogeneous DC currents
- Twisted magnon as a magnetic tweezer
- Motion of skyrmions in nanowires driven by magnonic momentum-transfer forces
- Absorbing boundary layers for spin wave micromagnetics
- Microwave-induced dynamic switching of magnetic skyrmion cores in nanodots
- A Luneburg lens for spin waves
- Generation of single skyrmions by picosecond magnetic field pulses
- Current-induced skyrmion motion on magnetic nanotubes
- Controlled creation of nanometric skyrmions using external magnetic fields
- Probing the Dzyaloshinskii-Moriya interaction via the propagation of spin waves in ferromagnetic thin films
- X-Ray Microscopy of Spin Wave Focusing using a Fresnel Zone Plate
- On quantifying the topological charge in micromagnetics using a lattice-based approach
- Spin-Wave Optical Elements: Towards Spin-Wave Fourier Optics
- Creation of nanometric magnetic skyrmions by global application of circularly polarized microwave magnetic field
- Generation and stability of dynamical skyrmions and droplet solitons
- Off-axial focusing of spin-wave lens in the presence of Dzyaloshinskii-Moriya interaction