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Schematic structures and in-plane (black)/out-of-plane (red) magnetic hysteresis loops of (a) [Co(0.3)/Pd(0.3)]3/Co-capping samples without oxygen insertion (Stack A) and (b) [Co(0.3)/Pd(0.3)]3/CoO-capping samples (Stack B), where the numbers in parentheses represent the thickness of the film in nanometers. Both samples were post-annealed at 400 °C for an hour under a 3 T magnetic field.
