Physics – Condensed Matter – Materials Science
Scientific paper
2011-02-02
Physics
Condensed Matter
Materials Science
18 pages, 3 figures, 1 table
Scientific paper
We found from analytical derivations and micromagnetic numerical simulations that there exist two distinct normal modes in apparently complex vortex gyrotropic motions in two dipolar-coupled magnetic nanodisks. The normal modes have characteristic higher and lower single angular eigenfrequencies with their own elliptical orbits elongated along the x (bonding axis) and y axes, respectively. The superposition of the two normal modes results in coupled vortex gyrations, which depend on the relative vortex-state configuration in a pair of dipolar-coupled disks. This normal-mode representation is a simple means of understanding the observed complex vortex gyrations in two or more dipolar-interacting disks of various vortex-state configurations.
Han Dong-Soo
Jung Hyunsung
Kim Sang-Koog
Lee Ki-Suk
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