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Dynamics of coupled vortices in layered magnetic nanodots
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View: Figures


Image of FIG. 1.
FIG. 1.

Diagram showing the trilayer disk structure.

Image of FIG. 2.
FIG. 2.

Vortex eigenfrequencies vs. (a) the interdot separation , and (b) the dot aspect ratio for d=1nm and L=40nm. The solid and dashed lines show the eigenfrequencies for as calculated from Eq. (3). In (a), the dotted line corresponds to the eigenfrequency of an isolated dot. The symbols show micromagnetic data for , 750, and 1000 nm.

Image of FIG. 3.
FIG. 3.

Trajectory of a vortex core precessing around the remanent equilibrium position for and is shown over (a) 16 ns and (b) 48 ns (one period of the low-frequency mode). The amplitudes and frequencies of the (6 nm and 21 MHz) and (76 nm and 0.51 GHz) oscillations were taken from the micromagnetic simulations for 2R=1000 nm.

Image of FIG. 4.
FIG. 4.

Simulation results for and . Volume-averaged magnetization ( component) of disk with for (a) the full disk, and (b) the individual layers; (c) the core position difference oscillates at a high frequency, while (d) the mean core position varies at a much lower frequency (core positions are for ).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dynamics of coupled vortices in layered magnetic nanodots