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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. Simple antiferromagnets and ferromagnets can be considered as nonconical helimagnets with helical angles of 180 and 0°, respectively. In the same way, nonconical helimagnets may be considered as conical helimagnets with cone angle of 0°. Some typical helimagnets are listed in the table. The magnetic structures have been detected by neutron diffraction.
|Substance||Magnetic structure||Temperature, K|
|MnO2||Nonconical helix||0 < T < 84|
|MnAu2||Nonconical helix||0 < T < 363|
|Dy||Nonconical helix||85 < T < 179|
|Ferromagnet||0 < T < 85|
|MnCr2O4||Simple ferrimagnet||18 < T < 43|
|Complex conical helix||0 < T < 18|
|Er||Conical helix||0 < T < 20|
|Complex oscillation||20 < T < 53|
|Sinusoidal antiferromagnet||53 < T < 85|