Fig. 3: Static magnetic properties with CuO_x and C₆₀ over layers.

Hysteresis loops of a β-W (10 nm)/CFB (4 nm)/CuO_x (3 nm) [WCF1] and b β-W (10 nm)/CFB (4 nm)/C₆₀ (25 nm) [WCFO1] heterostructures measured along easy axis, c CFB thickness dependent H_c of various heterostructures, and magnetic domain images of d, e WCF1 and f, g WCFO1 heterostructures.