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. 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]

See also

References
  1. 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.
  2. 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.
  3. 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.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.