Beschreibung:
<jats:p>Precession modes of rectangular nanodot arrays with diameters of 90 and 150 nm and varied dipolar interaction are systematically studied by vector network analyzer ferromagnetic resonance, and micromagnetic simulations. The large dots reveal two dominant modes: a low frequency edge mode and a high frequency center mode, while in the smaller dots only the edge mode is observed. With increasing dipolar interaction, the precession-mode frequencies increase. The interaction has a stronger influence on the edge mode than on the center mode, resulting in different precession behaviors in different ranges of magnetic fields: well-separated modes in high fields and a merging of edge and center modes at low fields. At low fields and for strong dipolar interaction, coherent precession of the whole dot array is observed.</jats:p>