Helimagnetism
Helimagnetism is an incommensurate form of magnetic ordering that results from the competition between ferromagnetic and antiferromagnetic exchange interactions, and is typically only observed at liquid helium temperatures.[citation needed] Spins of neighbouring magnetic moments arrange themselves in a spiral or helical pattern, with a characteristic turn angle of somewhere between 0 and 180 degrees. It is possible to view ferromagnetism and antiferromagnetism as helimagnetic structures with characteristic turn angles of 0 and 180 degrees respectively. Helimagnetic order breaks spatial inversion symmetry, as it can be either left-handed or right-handed in nature.
Helimagnetism was first proposed in 1959, as an explanation of the magnetic structure of manganese dioxide.[1] Initially applied to neutron diffraction, it has since been observed more directly by Lorentz electron microscopy.[2] Some helimagnetic structures are reported to be stable up to room temperature.[3]
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References[edit]
- ^ Yoshimori, Akio (1959-06-15). "A New Type of Antiferromagnetic Structure in the Rutile Type Crystal". Journal of the Physical Society of Japan. Physical Society of Japan. 14 (6): 807–821. doi:10.1143/jpsj.14.807. ISSN 0031-9015.
- ^ Uchida, Masaya; Onose, Yoshinori; Matsui, Yoshio; Tokura, Yoshinori (2006-01-20). "Real-Space Observation of Helical Spin Order". Science. American Association for the Advancement of Science (AAAS). 311 (5759): 359–361. doi:10.1126/science.1120639. ISSN 0036-8075.
- ^ Zhang, S. L.; Stasinopoulos, I.; Lancaster, T.; Xiao, F.; Bauer, A.; et al. (2017-03-09). "Room-temperature helimagnetism in FeGe thin films". Scientific Reports. Springer Science and Business Media LLC. 7 (1): 123. doi:10.1038/s41598-017-00201-z. ISSN 2045-2322.
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