  We examine spin excitation or polarization transfer via long-range
interacting spin chains with diagonal and off-diagonal disorder. To this end,
we determine the mean localization length of the single-excitation eigenstates
of the chain for various strengths of the disorder. We then identify the energy
eigenstates of the system with large localization length and sufficient support
at the chain boundaries that are suitable to transfer an excitation between the
sender and receiver spins connected to the opposite ends of the chain. We
quantify the performance of two transfer schemes involving weak static
couplings of the sender and receiver spins to the chain, and time-dependent
couplings realizing stimulated adiabatic passage of the excitation via the
intermediate eigenstates of the chain which exhibits improved performance.
