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We studied the quantum dynamics of ferromagnetic domain walls (topologicalkink-type solitons) in one dimensional ferromagnetic spin chains. We show thatthe tunneling probability does not depend on the number of spins in a domainwall; thus, this probability can be large even for a domain wall containing alarge number of spins. We also predict that there is a strong interplay betweenthe tunneling of a wall from one lattice site to another (tunneling of the kinkcoordinate) and the tunneling of the kink topological charge (so-calledchirality). Both of these elementary processes are suppressed for kinks inone-dimensional ferromagnets with half-integer spin. The dispersion law (i.e.,the domain wall energy versus momentum) is essentially different for chainswith either integer or half-integer spins. The predicted quantum effects couldbe observed for mesoscopic magnetic structures, e.g., chains of magneticclusters, large-spin molecules, or nanosize magnetic dots.

Chirality tunneling and quantum dynamics for domain walls in mesoscopic ferromagnets