Spin-Wave Spectrum in Magnetic Nanodot with Continuous Transition between Vortex, Bloch-type Skyrmion and Néel-type Skyrmion States

Abstract

We study spin-wave excitations in a circular ferromagnetic nanodot in different inhomogeneous, topologically non-trivial magnetization states, specifically, vortex and skyrmion states. Gradual change in the strength of the out-of-plane magnetic anisotropy and the Dzyaloshinskii-Moriya exchange interaction leads to continuous phase transitions between different stable magnetic configurations and allows for mapping of dynamic spin modes in and between the vortex, Bloch-type skyrmion and Néel-type skyrmion states. Our study elucidates the connections between gyrotropic modes, azimuthal spin waves and breathing modes in various stable magnetization states and helps to understand the rich spin excitation spectrum on the skyrmion background.

References in corpus (6)

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• Inertia and chiral edge modes of a skyrmion magnetic bubble
• Breathing modes of confined skyrmions in ultrathin magnetic dots
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Cited by in corpus (9)

• Skyrmions in Magnetic Multilayers
• Coupled skyrmion breathing modes in synthetic ferri- and antiferromagnets
• Bi-stability of magnetic skyrmions in ultrathin multilayer nanodots induced by magnetostatic interaction
• Effect of Dzyaloshinskii-Moriya interaction on magnetic vortex switching driven by radial spin waves
• Spin-wave mediated interactions for Majority Computation using Skyrmions and Spin-torque Nano-oscillators
• From the spin eigenmodes of isolated Néel skyrmions to the magnonic bands of a skyrmionic crystal: a micromagnetic study as a function of the strength of both the interfacial Dzyaloshinskii-Moriya and the exchange constants
• Eigenmodes of magnetic skyrmion lattices
• Zero-field topological Hall effect in BiSb/MnGa bi-layers as a signature of ground-state skyrmions at room temperature
• Commensurate vortex core switching in magnetic nanodisks at Gigahertz frequencies