Two Circular-Rotational Eigenmodes in Vortex Gyrotropic Motions in Soft Magnetic Nanodots

Abstract

We found, by micromagnetic numerical and analytical calculations, that the clockwise (CW) and counterclockwise (CCW) circular-rotational motions of a magnetic vortex core in a soft magnetic circular nanodot are the elementary eigenmodes existing in the gyrotropic motion with respect to the corresponding CW and CCW circular-rotational-field eigenbasis. Any steady-state vortex gyrotropic motions driven by a linearly polarized oscillating in-plane magnetic field in the linear regime can be perfectly understood according to the superposition of the two circular eigenmodes, which show asymmetric resonance characteristics reflecting the vortex polarization. The relative magnitudes in the amplitude and phase between the CCW and CW eigenmodes determine the elongation and orientation of the orbital trajectories of the vortex core motions, respectively, which trajectories vary with the polarization and chirality of the given vortex as well as the field frequency across the resonance frequency.

30 pages, 7 figures

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• Electrical switching of vortex core in a magnetic disk
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• Dynamic Origin of Vortex Core Switching in Soft Magnetic Nanodots
• Current-driven resonant excitation of magnetic vortex
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• Dynamics of Vortex Core Switching in Ferromagnetic Nanodisks
• Low-frequency vortex dynamic susceptibility and relaxation in mesoscopic ferromagnetic dots
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• Twisted Magnon Frequency Comb and Penrose Superradiance
• Memory-bit selective recording in vortex-core cross-point architecture
• Dynamic Excitations of Chiral Magnetic Textures
• Quantitative understanding of magnetic vortex oscillations driven by spin-polarized out-of-plane dc current: Analytical and micromagnetic numerical study
• Normal modes of coupled vortex gyration in two spatially separated magnetic nanodisks
• Unidirectional sub-100 ps magnetic vortex core reversal
• Non-linear vortex dynamics and transient effects in ferromagnetic disks
• Proposal of a robust measurement scheme for the non-adiabatic spin torque using the displacement of magnetic vortices
• Polarization-selective vortex-core switching by orthogonal Gaussian-pulse currents