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Nagase, T; Komatsu, M; So, Y G; Ishida, T; Yoshida, H; Kawaguchi, Y; Tanaka, Y; Saitoh, K; Ikarashi, N; Kuwahara, M; Nagao, M
Physical review letters, 09/2019, Letnik: 123, Številka: 13Journal Article
The organizing of magnetic skyrmions shows several forms similar to atomic arrays of solid states. Using Lorentz transmission electron microscopy, we report the first direct observation of a stable liquid-crystalline structure of skyrmions in chiral magnet Co8.5Zn7.5Mn4(110) thin film, caused by magnetic anisotropy and chiral surface twist. Elongated skyrmions are oriented and periodically arranged only in the ⟨110⟩ directions, whereas they exhibit short-range order along the ⟨001⟩ directions, indicating a smectic skyrmion state. In addition, skyrmions possess anisotropic interaction with an opposite sign depending on the crystal orientation, in contrast to existing isotropic interaction.
