Mechanical magnets of magnetostrictive, remanent, circularly magnetized material

摘要: Mechanically controllable magnet made of a magnetostrictive, circularly magnetically anisotropic, magnetized rod. There is no apparent magnetism externally. When rod twisted, circular anisotropy becomes helical and magnetization also to produce an axial field component hence externally magnetism. untwists, it restores itself its apparently non-magnetic condition.