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Symmetry breaking in the formation of magnetic vortex states in a permalloy nanodisk

Im, Mi-Young ; Fischer, Peter ; Yamada, Keisuke ; Sato, Tomonori ; Kasai, Shinya ; Nakatani, Yoshinobu ; Ono, Teruo

Nature communications, 2012, Vol.3 (1), p.983-983, Article 983 [Periódico revisado por pares]

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Título:
Symmetry breaking in the formation of magnetic vortex states in a permalloy nanodisk
Autor: Im, Mi-Young ; Fischer, Peter ; Yamada, Keisuke ; Sato, Tomonori ; Kasai, Shinya ; Nakatani, Yoshinobu ; Ono, Teruo
É parte de: Nature communications, 2012, Vol.3 (1), p.983-983, Article 983
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: The magnetic vortex in nanopatterned elements is currently attracting enormous interest. A priori, one would assume that the formation of magnetic vortex states should exhibit a perfect symmetry, because the magnetic vortex has four degenerate states. Here we show the first direct observation of an asymmetric phenomenon in the formation process of vortex states in a permalloy nanodisk using high-resolution full-field magnetic transmission soft X-ray microscopy. Micromagnetic simulations confirm that the intrinsic Dzyaloshinskii-Moriya interaction, which arises from the spin-orbit coupling due to the lack of inversion symmetry near the disk surface, as well as surface-related extrinsic factors, is decisive for the asymmetric formation of vortex states.
Editor: England: Nature Publishing Group
Idioma: Inglês

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