Keffer, Frederic Department of Physics, University of Pittsburgh, Pittsburgh, Pennsylvania.
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A property possessed by some metals, alloys, and salts of transition elements in which the atomic magnetic moments, at sufficiently low temperatures, are arranged in a spiral or helix. It may be seen from the illustration that simple antiferromagnets and ferromagnets can be considered as nonconical helimagnets with helical angles φ of 180 and 0°, respectively. In the same way, nonconical helimagnets may be considered as conical helimagnets with cone angle θ of 0°. Some typical helimagnets are listed in the table. The magnetic structures have been detected by neutron diffraction.
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