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(Color online) (a) A family of FORC’s for the Fe nanodots at , whose starting points are represented by black dots. (b) The corresponding FORC distribution as a contour plot against applied field and reversal field . The two red FORC’s in (a) correspond to line scans 1 and 2 in (b). The dotted black box in (b) highlights a residual FORC feature due to single domain nanodots.
(Color online) (a) Representative major hysteresis loops at 10, 200, and , and three-dimensional FORC distributions at (b) and (c) . The black arrow in (b) and (c) indicates a feature in the FORC distribution due to the single domain phase. A cross-sectional view of the FORC distribution along the local coercivity axis is shown in (d).
(Color online) (a) Percentage of the nanodots that are single domain at a given temperature. (b) Temperature dependence of the nucleation (solid squares) and annihilation (open circles) fields of the vortex phase, determined from peak positions in the FORC distribution. Solid lines are guides to the eye.
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