Dark discrete breather modes in monoaxial chiral helimagnet with easy-plane anisotropy

Abstract

Nonlinearity and discreteness are two pivotal factors for an emergence of discrete breather excitations in various media. We argue that these requirements are met in the forced ferromagnetic phase of the monoaxial chiral helimagnet CrNb${}_3$S${}_6$ due to specific domain structure of the compound. The stationary, time-periodic breather modes appear as the discrete breather lattice solutions whose period mismatches with a system size. Thanks to easy-plane single-ion anisotropy intrinsic to CrNb${}_3$S${}_6$, these modes are of the dark type with frequencies lying within the linear spin-wave band, close to its bottom edge. They represent cnoidal states of magnetization, similar to the well-known soliton lattice ground state, with differing but limited number of embedded $2\pi$-kinks. Linear stability of these dark breather modes is verified by means of the Floquet analysis. Their energy controlled by two parameters, namely the breather lattice period and amplitude, falls off linearly with a growth of the kink number. These results may pave a new path to design spintronic resonators on the base of chiral helimagnets.

arXiv comment13 pages, 13 figures; accepted in Physical Review B

References in corpus (22)

• Discrete Breathers
• Beyond skyrmions: Review and perspectives of alternative magnetic quasiparticles
• Discrete breathers in nonlinear lattices: Experimental detection in a Josephson array
• Observation of breathers in Josephson ladders
• Discrete Breathers in One-Dimensional Diatomic Granular Crystals
• Experimental Generation and Observation of Intrinsic Localized Spin Wave Modes in an Antiferromagnet
• Discrete breathers in a forced-damped array of coupled pendula: Modeling, Computation and Experiment
• Magnetic phase transitions in single crystals of the chiral helimagnet Cr1/3NbS2
• Nonreciprocal magnon propagation in a noncentrosymmetric ferromagnet
• Evidence for moving breathers in a layered crystal insulator at 300K
• Finite-Temperature Properties of Three-Dimensional Classical Chiral Helimagnets
• Spintronics on Chiral Objects
• Demonstration of the stability or instability of multibreathers at low coupling
• Compactlike discrete breathers in systems with nonlinear and nonlocal dispersive terms
• Discrete breathers in a nonlinear electric line: Modeling, Computation and Experiment
• Dark breathers in a normal dispersion optical microresonator
• Discrete breathers in classical spin lattices
• Breather lattice and its stabilization for the modified Korteweg-de Vries equation
• On Some Classes of mKdV Periodic Solutions
• Intrinsic Localized Modes of a Classical Discrete Anisotropic Heisenberg Ferromagnetic Spin Chain
• Theory of standing spin waves in finite-size chiral spin soliton lattice
• Exact Intrinsic Localized Excitation of an Anisotropic Ferromagnetic Spin Chain in External Magnetic Field with Gilbert Damping, Spin Current and PT-Symmetry