Collective spin excitations of helices and magnetic skyrmions: review and perspectives of magnonics in non-centrosymmetric magnets

Abstract

Magnetic materials hosting correlated electrons play an important role for information technology and signal processing. The currently used ferro-, ferri- and antiferromagnetic materials provide microscopic moments (spins) that are mainly collinear. Recently more complex spin structures such as spin helices and cycloids have regained a lot of interest. The interest has been initiated by the discovery of the skyrmion lattice phase in non-centrosymmetric helical magnets. In this review we address how spin helices and skyrmion lattices enrich the microwave characteristics of magnetic materials. When discussing perspectives for microwave electronics and magnonics we focus particularly on insulating materials as they avoid eddy current losses, offer low spin-wave damping, and might allow for electric field control of collective spin excitations. Thereby, they further fuel the vision of magnonics operated at low energy consumption.

arXiv comment38 pages, 16 figures

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• Colloquium: Quantum Properties and Functionalities of Magnetic Skyrmions
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• Observation of nonreciprocal magnon Hanle effect
• Magnonic band gap and mode hybridization in continuous Permalloy film induced by vertical coupling with an array of Permalloy ellipses
• Coupled breathing modes in one-dimensional Skyrmion lattices
• Modelling spin waves in noncollinear antiferromagnets: spin-flop states, spin spirals, skyrmions and antiskyrmions
• Emergent SU(3) magnons and thermal Hall effect in the antiferromagnetic skyrmion lattice
• Skyrmion Based Magnonic Crystals
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• Quantum Damping of Skyrmion Crystal Eigenmodes due to Spontaneous Quasiparticle Decay
• Dynamical Switching of Magnetic Topology in Microwave-Driven Itinerant Magnet
• Skyrmion crystals in centrosymmetric triangular magnets under hexagonal and trigonal single-ion anisotropy
• Laser-controlled real- and reciprocal-space topology in multiferroic insulators
• Essential model parameters for nonreciprocal magnons in multisublattice systems
• Topological spin dynamics in cubic FeGe near room temperature
• Effective damping enhancement in noncollinear spin structures
• Topical Review on Skyrmions and Hall Transport
• Solitary wave excitations of skyrmion strings in chiral magnets
• Magnetoelectric Cavity Magnonics in Skyrmion Crystals
• Signatures of a liquid-crystal transition in spin-wave excitations of skyrmions
• Spin Wave Radiation by a Topological Charge Dipole
• Breathing Mode of a Skyrmion on a Lattice
• Towards an effective theory of skyrmion crystals
• Localized spin waves in isolated $k\pi$ skyrmions
• Megahertz dynamics in skyrmion systems probed with muon-spin relaxation
• Curvature induced magnonic crystal in nanowires
• Frustration model and spin excitations in the helimagnet FeP
• Anisotropic skyrmion and multi-$q$ spin dynamics in centrosymmetric Gd${}_2$PdSi${}_3$
• Nonlinear dynamics of topological ferromagnetic textures for frequency multiplication
• Total helicity of electromagnetic fields and matter
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