proportional to the spin-wave group velocity [ 144]. Such a phase shift is negligible for
large group velocities, such as those occurring in fibers. However, the induced phase is
not small in solids, and its effect becomes important in the case of spin waves. Based
on this general concept, it is found that an arbitrary small phase shift across the ini-
tial pulse can change the character of the soliton generation and affect the number of
dark solitons formed at the output end. By 1998, it was possible to generate a train of
magnetic bright [ 145] and dark [146] solitons in a ring geometry.
14.4.3 Soliton
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.