Three-Dimensional Dynamics of a Magnetic Hopfion Driven by Spin Transfer Torque.

@article{Liu2020ThreeDimensionalDO,
  title={Three-Dimensional Dynamics of a Magnetic Hopfion Driven by Spin Transfer Torque.},
  author={Yizhou Liu and Wentao Hou and Xiufeng Han and Jiadong Zang},
  journal={Physical review letters},
  year={2020},
  volume={124 12},
  pages={
          127204
        }
}
Magnetic hopfion is a three-dimensional (3D) topological soliton with novel spin structure that would enable exotic dynamics. Here, we study the current-driven 3D dynamics of a magnetic hopfion with a unit Hopf index in a frustrated magnet. Attributed to the spin Berry phase and symmetry of the hopfion, the phase space entangles multiple collective coordinates, thus the hopfion exhibits rich dynamics including longitudinal motion along the current direction, transverse motion perpendicular to… 

Figures from this paper

Current-Induced Dynamics of Chiral Magnetic Structures: Creation, Motion, and Applications
Magnetic textures can be manipulated by electric currents via the mechanisms of spin-transfer and spin-orbit-torques. We review how these torques can be exploited to create chiral magnetic textures
Creation and confirmation of Hopfions in magnetic multilayer systems
Topological solitons have been studied for decades in classical field theories, and have started recently to impact condensed matter physics. Among those solitons, magnetic skyrmions are
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
Electronic scattering off a magnetic hopfion
We study scattering of itinerant electrons off a magnetic hopfion in a three-dimensional metallic magnet described by a magnetization vector S(r). A hopfion is a confined topological soliton of S(r)
Global weak solutions for the Landau-Lifshitz-Gilbert-Vlasov-Maxwell system coupled via emergent electromagnetic fields
Motivated by recent models of current driven magnetization dynamics, we examine the coupling of the Landau-Lifshitz-Gilbert equation and classical electron transport governed by the Vlasov-Maxwell
The Bloch point 3D topological charge induced by the magnetostatic interaction
TLDR
The calculated Bloch point non-zero gyrovector leads to important dynamical consequences such as the appearance of topological Hall effect.
Topological spin crystals by itinerant frustration
  • S. Hayami, Y. Motome
  • Physics
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2021
TLDR
Focusing on the interplay between charge and spin degrees of freedom in itinerant electron systems, it is shown that itinerant frustration, which is the competition among electron-mediated interactions, plays a central role in stabilizing a variety of topological spin crystals including a skyrmion crystal with unconventional high skyrnion number, meron crystals, and hedgehog crystals.
Magnetism in curved geometries
Curvature impacts physical properties across multiple length scales, ranging from the macroscopic scale, where the shape and size vary drastically with the curvature, to the nanoscale at interfaces
Scattering modes of skyrmions in a bilayer system with ferromagnetic coupling
TLDR
This work studied the interaction between two skyrmions living on different parallel ferromagnetic racetracks connected by an exchange-like interaction and demonstrated that even in the case here called free skyrMions, there is a small and brief interaction when both are close enough, but theSkyrmion in the top layer does not drag the skyr mions in the bottom layer.
Electrical manipulation of skyrmions in a chiral magnet
Writing, erasing and computing are three fundamental operations required by any working electronic device. Magnetic skyrmions could be essential bits in promising in emerging topological spintronic
...
1
2
...

References

SHOWING 1-10 OF 87 REFERENCES
Current-Driven Dynamics of Magnetic Hopfions.
TLDR
It is found that, in ferromagnetic materials, two types of hopfions, Bloch-type and Néel-type hopfion, can be excited as metastable states in the presence of bulk and interfacial Dzyaloshinskii-Moriya interactions, respectively.
Binding a hopfion in a chiral magnet nanodisk
Hopfions are three-dimensional (3D) topological textures characterized by the integer Hopf invariant $Q_H$. Here, we present the realization of a zero--field, stable hopfion spin texture in a
Hopfions in chiral magnets
  • P. Sutcliffe
  • Physics
    Journal of Physics A: Mathematical and Theoretical
  • 2018
A magnetic Hopfion is a three-dimensional topological soliton that consists of a closed loop of a twisted magnetic Skyrmion string. The results of numerical simulations are presented that demonstrate
Static Hopf Solitons and Knotted Emergent Fields in Solid-State Noncentrosymmetric Magnetic Nanostructures.
TLDR
This work model the existence of such static solitons with different Hopf index values in noncentrosymmetric solid magnetic nanostructures with a perpendicular interfacial magnetic anisotropy and shows how this surface an isotropy, along with the Dzyaloshinskii-Moriya interactions and the geometry of nanostructure, stabilize hopfions.
Roles of nonequilibrium conduction electrons on the magnetization dynamics of ferromagnets.
TLDR
This work compute the response of the conduction electron spins in a spatial and time varying magnetization M(r,t) in the time-dependent semiclassical transport theory and shows that the induced nonequilibrium conduction spin density generates four spin torques acting on the magnetization.
Scattering of knotted vortices (Hopfions) in the Faddeev?Skyrme model
Several materials, such as ferromagnets, spinor Bose–Einstein condensates and some topological insulators, are now believed to support knotted structures. One of the most successful base-models
Theory of current-driven motion of Skyrmions and spirals in helical magnets
We study theoretically the dynamics of the spin textures, i.e., Skyrmion crystal (SkX) and spiral structure (SS), in two-dimensional helical magnets under external current. By numerically solving the
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
Magnetic vortex state stability, reversal and dynamics in restricted geometries.
Magnetic vortices are typically the ground states in geometrically confined ferromagnets with small magnetocrystalline anisotropy. In this article I review static and dynamic properties of the
...
1
2
3
4
5
...