Observation of coupled vortex gyrations by 70-ps-time- and 20-nm-space-resolved full-field magnetic transmission soft x-ray microscopy

Abstract

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Information-signal-transfer rate and energy loss in coupled vortex-state networks

“…[12][13][14][15][16] The magnetic vortex, which is characterized by in-plane curling magnetizations (chirality, C) and out-of-plane magnetizations (polarization, p) in the central region, has a characteristic translational mode (known as gyration): a vortex core orbits around its equilibrium center position at a characteristic eigenfrequency ranging from 10 MHz to 1 GHz according to the dot dimensions. 17 During the gyration, the vortex core shifted from its center position leads to non-zero side-surface charges, thus producing stray fields around the dot itself.…”

X-ray imaging of vortex cores in confined magnetic structures

“…The static [1][2][3][4][5][6] and dynamic [7][8][9][10][11][12][13] properties of these objects have recently attracted an increased scientific interest both for fundamental and applied reasons. For example, magnetic vortex structures were suggested as potential future high-density and non-volatile recording systems [14][15][16][17], since the size of the vortex core is proportional to the magnetic exchange length Λ, which can extend into the sub-10 nm regime [18], and the magnetic core represents a very stable spin configuration, in fact protected by topology. However, to further advance through experimental investigations the physical understanding of magnetic vortex structures, particularly the fast dynamics of the vortex core, advanced analytical microscopic tools with high spatial and temporal resolution are required.…”

Time-resolved imaging of domain pattern destruction and recovery via nonequilibrium magnetization states

“…Previous research was mainly focused on the dynamics initiated by small deflections of the vortex core from the center using spin currents [6][7][8][9] or dynamic external fields of typically a few millitesla amplitude [10][11][12][13][14][15]. The result of this excitation is an oscillation around the center in form of a gyrotropic eigenmode constrained by a parabolic potential [16].…”