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Normalized magnetization plotted vs external field for sample X6 (a) and sample X7 (b) at . The solid symbols mark the major loop data between , while the open symbols were measured between after out-of-plane demagnetization. The insets show the range between in more detail. (c) and (d) are MTXM images of the demagnetized state of samples X6 and X7, respectively, showing AF domains with different domain wall structures.
(Double column) MTXM images of sample X6 (a)–(g) and sample X7 (h)–(n) as a function of applied field.
[(a) and (b)] Calculated total energy density for an AF domain wall as a function of the FM width for (a) and (b) for different field values as indicated. Inset: Close up of the region with small . Black dots are a guide to the eye for the energy minimum position. (c) Energy barrier height with respect to the first energy minimum as a function of field. (d) Calculated optimum as a function of field (open symbols) compared with FM domain widths extracted from Fig. 2 (solid symbols).
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