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Protocol I. (a) Ni layer demagnetization at room temperature. (b) MOKE hysteresis loop at illuminating the whole sample after cooling at the remanence set in (a). (c) Spatially resolved MOKE loops at nine positions. Color-coded background: red, domains yielding negative EB; blue, domains yielding positive EB; white, domain walls between opposite domains.
Protocol II. (a) MOKE loop at illuminating the whole sample after cooling from room temperature at intermediate . (b) Spatially resolved MOKE loops at different positions. Illustrated color-coded background as in Fig. 1.
(a) DHL for intermediate . (b) Comparison between a single loop (low ) (squares) and the rescaled negative-biased subloop from (a) (circles). Both loops were measured by SQUID at 10 K. (c) Illustrated spin configuration at and (d) . Blue (left and right) and red (middle) domains yield positive and negative EB, respectively.
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