  Majorana bound states have been recently observed at the boundaries of
one-dimensional topological superconductors. Yet, controlling the localization
of the Majorana states, which is essential to the realization of any
topological quantum device, is an ongoing challenge. To this end, we introduce
a mechanism which can break a topologically homogeneous state via the formation
of topological domains, and which can be exploited to control the position of
Majorana states. We found in fact that in the presence of amplitude-modulated
fields, contiguous magnetic domains can become topologically inequivalent and,
as a consequence, Majorana states can be pinned to the domain walls of the
magnetic structure. The formation of topological domains and the position of
Majorana states can be externally controlled by tuning an applied field (e.g.,
magnetic or gate).
