  A generalized inhomogeneous higher-order nonlinear Schrodinger (GIHNLS)
equation for the Heisenberg ferromagnetic spin chain system in (1+1)-dimensions
under zero boundary condition at infinity is taken into account. The spectral
analysis is first performed to generate a related matrix Riemann-Hilbert
problem on the real axis. Then, through solving the resulting matrix
Riemann-Hilbert problem by taking the jump matrix to be the identity matrix,
the general bright multi-soliton solutions to the GIHNLS equation are attained.
Furthermore, the one- and two-soliton solutions are written out and analyzed by
figures.
