  Toroidal quantum states are most promising for building quantum computing and
information storage devices as they are insensitive to homogeneous magnetic
fields, but interact with charge and spin currents, allowing this moment to be
manipulated purely by electrical means. Coupling molecular toroids into larger
toroidal moments via ferrotoroidic interactions can be pivotal not only to
enhance ground state toroidicity, but also to develop materials displaying
ferrotoroidic ordered phases, which sustain linear magneto-electric coupling
and multiferroic behaviour. However, engineering ferrotoroidic coupling is
known to be a challenging task. Here we have isolated a
Cr$^{\mathrm{III}}$Dy$^{\mathrm{III}}_6$ complex, which exhibits the much
sought-after ferrotoroidic ground state with an enhanced toroidal moment,
solely arising from intramolecular dipolar interactions. Moreover, a
theoretical analysis of the observed sub-Kelvin zero-field hysteretic spin
dynamics of Cr$^{\mathrm{III}}$Dy$^{\mathrm{III}}_6$ reveals the pivotal role
played by ferrotoroidic states in slowing down the magnetic relaxation, in
spite of large calculated single-ion quantum tunnelling rates.
