S. Seki, X. Z. Yu, S. Ishiwata, Y. Tokura
Science 336, 198 (2012)
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| Fig. 1. (A) Crystal structure of Cu2OSeO3, characterized by two inequivalent Cu2+ sites with different oxygen coordination. (B) Ferrimagnetic spin arrangement on Cu2+ sites. (C to G) Lateral magnetization distribution map for a thin-film (~100-nm-thick) sample of Cu2OSeO3, obtained through the analysis of Lorentz TEM data taken at 5 K. The color wheel in the bottom-left corner of (F) shows the direction (hue) and relative magnitude (brightness) of the lateral magnetization. Panels (C) and (D), as well as (F) and (G), represent images for the (110) and (111) plane, respectively, and a magnetic field is applied normal to the observed sample plane. In both cases, proper screw-spin texture appears for zero magnetic field, whereas a skyrmion lattice with the identical spin chirality is formed for H = 800 Oe. A magnified view of (D) is shown in (E), where white arrows represent the magnetization direction. (H) Schematic illustration of a single magnetic skyrmion. |
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