  We present spectral hole-burning measurements of the
$^{4}I_{9/2}\rightarrow{}^4F_{3/2}$ transition in Nd$^{3+}$:YLiF$_4$. The
isotope shifts of Nd$^{3+}$ can be directly resolved in the optical absorption
spectrum. We report atomic frequency comb storage with an echo efficiency of up
to 35% and a memory bandwidth of 60 MHz in this material. The interesting
properties show the potential of this material for use in both quantum and
classical information processing.
