  A practically realizable magnetic hose, constructed by wrapping a
ferromagnetic cylinder with alternate superconductor-ferromagnet
heterostructure, was developed and its capability to transfer the static
magnetic fields, e.g., generated by an Nd-Fe-B magnet, was examined in this
letter. A diverse dependence of the transfer efficiency on the diameter of the
inner cylinder was found in the magnetic hose demonstrators and the underlying
cause was clarified by the finite-element simulations. Transfer efficiency of
over 50% in terms of a moderate field has been achieved in the best
demonstrator of this study, even with a thin sheet merely having moderate
magnetism to embody the ferromagnet in the heterostructure. This work links the
theoretically derived model with a physical reality and may also conceive
fantastic solutions to form a magnetic circuit with minimum leakage or to
create a magnetically shielded space, both of which are deemed promising in
most electromagnetic devices.
