(color online) Contour plot images converted from FORCs for (a) Nd–Dy–Fe–Co–B, (b) Nd–Dy–Fe–Co–B/Fe, (c) Nd–Dy–Fe–Co–B/Ta (2 nm)/Fe, (d) Nd–Dy–Fe–Co–B/Ta (100 nm)/Fe, and (e) Nd–Dy–Fe–Co–B/Ta (150 nm). Extracted (f) irreversible and (g) reversible distributions, which correspond to the samples in panels (a)–(e).^[31]