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Schematic of the magnetic structures of disorder : (a) noncollinear 3Q; (b) noncollinear 2Q, and (c) 1Q collinear spin configurations. Arrows indicate the spin directions.
As-grown Ni domain image of . The FeMn thickness increases from left to right indicated at the bottom axis.
Magnetic domain image at the edge of . The FeMn and Co layers are crossed wedge, and their thickness is indicated at the bottom and left axis, respectively. Both Ni layers are 15 ML.
Coercivity field (left axis) and remanence (right axis) as a function of film thickness at room temperature for . The external field was applied along the normal direction of the sample. The inset displays the FeMn layer thickness dependence of coercivity field for .
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