  The low energy magnetic excitation spectrum of charge stripe ordered
La(2-x)Sr(x)NiO4, x = 0.4 and x = 0.45 samples were studied by neutron
scattering. Two excitation modes are observed in both materials, one from the
ordered magnetic moments, and a second mode consistent with
pseudo-one-dimensional antiferromagnetic excitations of the charge stripe
electrons (q-1D). The dispersion of the q-1D excitation follows the same
relation as in x = 1/3 composition, with even spectral weight in the two
counter-propagating branches of the x = 0.4 sample, however in the $x = 0.45$
sample only one dispersion branch has any measurable spectral weight. The
evolution of the q-1D excitations on doping to the checkerboard charge ordered
phase is discussed.
