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The SEM image for a patterned structure of a mesoscopic NiFe ring with nanoconstrictions of a wire.
The MR curves at the field in the plane along 45° for different currents. (a) , (b) , (c) , and (d) . The circles represent the experimental MR curve sweeping from positive field to negative field, the triangles represent the experimental MR curve sweeping from negative field to positive field, and the thick line in (a) represents the simulation.
Switching fields ( and ) from vortex to onion state as function of the applied current.
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