Transportation of Static Magnetic Fields by a Practically Realizable Magnetic Hose

A practically realizable magnetic hose, constructed by wrapping a ferromagnetic cylinder with an alternating superconductor–ferromagnet (SC–FM) heterostructure, was developed and its capability to transfer the static magnetic fields, e.g., generated by a Nd–Fe–B magnet, is examined. 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 finite-element simulations. Transfer efficiency of over 50% in terms of a moderate field was achieved in the best demonstrator of this study, even with a thin sheet having only moderate magnetism to embody the FM in the heterostructure. This work links a theoretically derived model with physical reality and also conceives solutions to form a magnetic circuit with minimum leakage or to create a magnetically shielded space, both of which are promising for use in most electromagnetic devices.