Hopfion Dynamics in Chiral Magnets

Abstract

Resonant spin dynamics of topological spin textures are correlated with their topological nature, which can be employed to understand this nature. In this study, we present resonant spin dynamics of three-dimensional topological spin texture, i.e., Neel and Bloch hopfions. Using micromagnetic simulations, we stabilize Bloch and Neel hopfions with bulk and interfacial Dzyaloshinskii-Moriya interaction (DMI), respectively. We identify the ground state spin configuration of both hopfions, effects of anisotropies, geometric confinements, and demagnetizing fields. To confirm topological nature, Hopf number is calculated for each spin texture. Then, we calculate the resonance frequencies and spin-wave modes of spin precessions under multiple magnetic fields. Unique resonance frequencies and specific magnetic field dependence can help to guide experimental studies to identify the three-dimensional topological spin texture of hopfions in functioning chiral magnets when imaging is not possible.

15 pages, 7 figures

References in corpus (6)

• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmion at room temperature
• Creation and confirmation of Hopfions in magnetic multilayer systems
• Mode- and size-dependent Landau-Lifshitz damping in magnetic nanostructures: Evidence for non-local damping
• Topological spin dynamics in cubic FeGe near room temperature
• Dynamical Toroidal Hopfions in a Ferromagnet with Easy-Axis Anisotropy

Cited by in corpus (5)

• Emergent Magneto-multipoles and Nonlinear Responses of a Magnetic Hopfion
• Mutual conversion between a magnetic Neel hopfion and a Neel toron
• Lifetime, collapse and escape paths for hopfions in bulk magnets with competing exchange interactions
• A scalar product for computing fundamental quantities in matter
• Microscopic Theory of Nonlinear Hall Effect in Three-dimensional Magnetic Systems