Abstract
The effects of dipolar coupling on the static and dynamic behavior of coupled Ni80Fe20 dots in two lattice geometries have been systematically investigated as a function of film thickness t. For coupled two dots, a significant decrease in vortex nucleation and annihilation fields and a marked increase in ferromagnetic resonance (FMR) frequency were observed when compared with isolated dots of identical geometrical parameters. Interestingly, for t ≥ 50 nm, when three dots are coupled along two orthogonal directions, two distinct FMR absorption peaks and a two-step switching of vortex annihilation were observed due to configurational anisotropy. Our experimental results are in good agreement with both the analytical and micromagnetic simulations.
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