Tunable terahertz oscillation arising from Bloch-point dynamics in chiral magnets

  title={Tunable terahertz oscillation arising from Bloch-point dynamics in chiral magnets},
  author={Yu Li and Leonardo Pierobon and Michalis Charilaou and Hans-Benjamin Braun and Niels R. Walet and J{\"o}rg F. L{\"o}ffler and Jim J. Miles and Christoforos Moutafis},
  journal={arXiv: Mesoscale and Nanoscale Physics},
Skyrmionic textures are being extensively investigated due to the occurrence of novel topological magnetic phenomena and their promising applications in a new generation of spintronic devices that take advantage of the robust topological stability of their spin structures. The development of practical devices relies on a detailed understanding of how skyrmionic structures can be formed, transferred, detected and annihilated. In this work, our considerations go beyond static skyrmions and… 

Figures from this paper

Prediction of confined and controllable Bloch points in nanocubes of chiral magnets
This paper predicts that individual Bloch points, topological point defects with vanishing local magnetization, can be created and stabilized by magnetostatic and chiral interactions in nanocuboids,
Magnetic Bloch-point hopping in multilayer skyrmions and associated emergent electromagnetic signatures
Magnetic multilayers are promising tuneable systems for hosting magnetic skyrmions at/above room temperature. Revealing their intriguing switching mechanisms and associated inherent electrical
Topological magnetic dipoles and emergent field bundles in a ferromagnetic microstructure by X-ray magnetic vector tomography
. Advanced vector imaging techniques provide us with 3D maps of magnetization fields in which topological concepts can be directly applied to describe real-space experimental textures in non-ideal
Topological defect-mediated skyrmion annihilation in three dimensions
The creation and annihilation of magnetic skyrmions are mediated by three-dimensional topological defects known as Bloch points. Investigation of such dynamical processes is important both for
Unidirectional current-driven toron motion in a cylindrical nanowire
A magnetic toron is a spatially localized three-dimensional spin texture composed of skyrmionic layers with two Bloch points at its two ends. The magnetic toron can, thus, be stabilized in chiral


Magnetic skyrmions: advances in physics and potential applications
Magnetic skyrmions are small swirling topological defects in the magnetization texture. Their stabilization and dynamics depend strongly on their topological properties. In most cases, they are
Emergent electrodynamics of skyrmions in a chiral magnet
When an electron moves in a smoothly varying non-collinear magnetic structure, its spin orientation adapts constantly, thereby inducing forces that act both on the magnetic structure and on the
Current-induced skyrmion dynamics in constricted geometries.
This work shows by micromagnetic simulations that the current-induced motion of skyrmions in the presence of geometrical boundaries is very different from that in an infinite plane, and shows that a single skyrMion can be created by an electric current in a simple constricted geometry comprising a plate-shaped specimen of suitable size and geometry.
Skyrmions in chiral magnets with Rashba and Dresselhaus spin-orbit coupling
Skyrmions are topological spin textures of interest for fundamental science and applications. Previous theoretical studies have focused on systems with broken bulk inversion symmetry, where skyrmions
Nucleation, stability and current-induced motion of isolated magnetic skyrmions in nanostructures.
It is demonstrated by numerical investigations that an isolated skyrmion can be a stable configuration in a nanostructure, can be locally nucleated by injection of spin-polarized current, and can be displaced by current-induced spin torques, even in the presence of large defects.
Topological effects in nanomagnetism: from superparamagnetism to chiral quantum solitons
Micromagnetics has been the method of choice to interpret experimental data in the area of microscopic magnetism for several decades. In this article, we show how progress has been made to extend
Antiskyrmions stabilized at interfaces by anisotropic Dzyaloshinskii-Moriya interactions
On the level of micromagnetics, it is rigorously shown that chiral magnets can not only host skyrmions but also antiskyrmion as least energy configurations over all non-trivial homotopy classes.
Room-Temperature Current-Induced Generation and Motion of sub-100 nm Skyrmions.
This study demonstrates a method leading to the formation of magnetic skyrmions in a micrometer-sized track using homogeneous current injection and addresses the particularly important role of the magnetic inhomogeneities on the current-induced motion of sub-100 nm skyrMions for which the material grains size is comparable to theskyrmion diameter.
Ground state search, hysteretic behaviour, and reversal mechanism of skyrmionic textures in confined helimagnetic nanostructures
It is demonstrated that skyrmionic textures are the lowest energy states in helimagnetic thin film nanostructures at zero external magnetic field and in absence of magnetocrystalline anisotropy.
Room-temperature chiral magnetic skyrmions in ultrathin magnetic nanostructures.
This work reports on the observation of stable skyrmions in sputtered ultrathin Pt/Co/MgO nanostructures at room temperature and zero external magnetic field, substantiated by micromagnetic simulations and numerical models.