Direct imaging of phase relation in a pair of coupled vortex oscillators
Andreas Vogel, André Drews, Markus Weigand and 1 more
AIP Advances · 2012
doi:10.1063/1.4771683 (opens in a new tab)
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Abstract
We study the magnetization dynamics in a stray-field coupled pair of ferromagnetic squares in the vortex state. Micromagnetic simulations give an idea of the mediating stray field during vortex gyration. The frequency-dependent phase relation between the vortices in the spatially separated squares is studied using time-resolved scanning transmission x-ray microscopy while one element is harmonically excited via an alternating magnetic field. It is shown that the normal modes of coupled vortex-core motion can be understood as an attractive (low-frequency) and a repulsive (high-frequency) mode of the effective magnetic moments of the microstructures.
Abstract licence: CC BY
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