Three-dimensional dynamics of magnetic hopfion driven by spin transfer torque

TL;DR

This paper investigates the complex three-dimensional behavior of magnetic hopfions under spin transfer torque, revealing rich dynamics influenced by system parameters, which could advance 3D spintronics and topological soliton understanding.

Contribution

It introduces a detailed analysis of 3D hopfion dynamics driven by spin transfer torque, highlighting the influence of system parameters on their motion and stability.

Findings

Hopfions exhibit longitudinal, transverse, rotational, and dilation motions.

Dynamics depend on the ratio of non-adiabatic torque to damping.

Rich 3D behaviors could inform future spintronic applications.

Abstract

Magnetic hopfion is 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 unit Hopf index in a frustrated magnet. Attributed to 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 the current direction, rotational motion and dilation. Furthermore, the characteristics of hopfion dynamics is determined by the ratio between the non-adiabatic spin transfer torque parameter and the damping parameter. Such peculiar 3D dynamics of magnetic hopfion could shed light on understanding the universal physics of hopfions in different systems and boost the prosperous development of 3D spintronics.