  The influence of a strain-induced uniaxial magnetoelastic anisotropy on the
magnetic vortex core dynamics in microstructured magnetostrictive
Co$_{40}$Fe$_{40}$B$_{20}$ elements was investigated with time-resolved
scanning transmission x-ray microscopy. The measurements revealed a
monotonically decreasing eigenfrequency of the vortex core gyration with the
increasing magnetoelastic anisotropy, which follows closely the predictions
from micromagnetic modeling.
