Microhelix magnetized coils

Magnetic Microhelix Coil Structures.
Elliot J. Smith, Denys Makarov, Samuel Sanchez, Vladimir M. Fomin, and Oliver G.Schmidt
Phys. Rev. Lett. 107, 097204 (2011)

Dynamics of radial-magnetized microhelix coils.
Vladimir M. Fomin, Elliot J. Smith, Denys Makarov, Samuel Sanchez, and Oliver G. Schmidt
Phys. Rev. B 84, 174303 (2011)

Obtainable magnetization orientations of a helix coil. Micromagnetic simulations carried out on planar and coiled-up magnetic strips: (a) Initial magnetization is inplane, perpendicular-to-strip (left); hollow-bar-magnetized helix coils can be created (right). (b) Initial magnetization is in-plane, parallel-to-strip (left), results in a corkscrew-magnetized coil (right). (c) An out-of-plane magnetized strip (left) assembles into a radial-magnetized coil (right).