Figure 2
Spin-wave dispersion relation with excitation spectrum and derived phase- and group velocities.
(a) Dispersion relation 
for the first two quantized transversal Damon-Eshbach (DE) (
= 1 blue solid line, 
= 3 orange solid line) and backward volume (BV) (
= 1 yellow dashed line, 
= 3 purple dashed line) spin-wave modes of a permalloy (
= 1.04 T, 
= 
J/m) stripe with an effective width of 
= 10.12 μm, an effective length of 
= 35.1 μm and 30 nm thickness. The DE modes are calculated for an external field of 
= 60 mT amplitude reduced by the internal demagnetization field while the BV modes are calculated for an external field of 
= 16 mT amplitude. (b) Power spectral density 
of the excited wavenumbers 
by the magnetic field pulse determined by the Fourier transformation of the spatial magnetic field configuration for the 
component (green solid line) and the 
component (cyan solid line). (c) Phase velocities 
= 
for all calculated spin-wave modes. (d) Group velocity 
for all calculated spin-wave modes.
