Screw dislocations in cubic chiral magnets

Abstract

Helimagnets realize an effective lamellar ordering that supports disclination and dislocation defects. Here, we investigate the micromagnetic structure of screw dislocation lines in cubic chiral magnets using analytical and numerical methods. The far field of these dislocations is universal and classified by an integer strength $\nu$ that characterizes the winding of magnetic moments. We demonstrate that a rich variety of dislocation-core structures can be realized even for the same strength $\nu$. In particular, the magnetization at the core can be either smooth or singular. We present a specific example with $\nu =1$ for which the core is composed of a chain of singular Bloch points. In general, screw dislocations carry a non-integer but finite skyrmion charge so that they can be efficiently manipulated by spin currents.

14 pages, 10 figures

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• Fluctuation-induced first-order phase transition in Dzyaloshinskii-Moriya helimagnets
• Formation of a topological non-Fermi liquid in MnSi
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Cited by in corpus (16)

• Helitronics for classical and unconventional computing
• Nonlinear dynamics of skyrmion strings
• Quantum and classical magnetic Bloch points
• Stability and Nucleation of Dipole Strings in Uniaxial Chiral Magnets
• Instability of magnetic skyrmion strings induced by longitudinal spin currents
• Topological magnonic dislocations modes
• Observation of distorted tilted conical phase at the surface of a bulk chiral magnet with resonant elastic x-ray scattering
• Regularized Micromagnetic Theory for Bloch Points
• Static and Dynamics of Twisted Skyrmion Tubes in Frustrated Magnets
• Electric-current-assisted nucleation of zero-field hopfion rings
• Dislocation-Driven Nucleation Type Switching Across Repeated Ultrafast Magnetostructural Phase Transition
• Linked skyrmions in shifted magnetic bilayer
• Dislocation Patterning as a Mechanism for Flat Band Formation
• Effects of interlayer Dzyaloshinskii-Moriya interaction on the shape and dynamics of magnetic twin-skyrmions
• Topological transition and emergent elasticity of dislocation in skyrmion lattice: Beyond Kittel's magnetic-polar analogy
• Hopfions in screw chiral magnets