Helimagnetism

[1] It is possible to view ferromagnetism and antiferromagnetism as helimagnetic structures with characteristic turn angles of 0 and 180 degrees respectively.

Strictly speaking, helimagnets have no permanent magnetic moment, and as such are sometimes considered a complicated type of antiferromagnet.

[3] Initially applied to neutron diffraction, it has since been observed more directly by Lorentz electron microscopy.

The result is that centrosymmetric structures like the MnP-type (B31) compounds can also exhibit double-helix type helimagnetism where both left and right handed spirals coexist.

[8] For these itinerant helimagnets, the direction of the helicity can be controlled by applied electric currents and magnetic fields.