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(a) Lorentz 4D-STEM image shows the competition between in-plane and out-of-plane magnetic anisotropy causing a disturbance in the magnetic order on the mesoscale. This is caused by the inhomogeneity in chemical composition shown in (b), which dictates the order/disorder of the crystal structure illustrated in (c).
Scientific Achievement: Identified mesoscale phase separation and a corresponding variation of magnetic anisotropy driving the formation of spin textures in high-ordering temperature ferromagnet Fe5-xGeTe2 (FGT).
Significance and Impact: Established a direct, quantitative relationship between local magnetic anisotropy and Fe-vacancy distribution in FGT, enabling logical design of magnetic properties.
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