Fig. 1
Microstructure and magnetic properties. a Cross-sectional TEM images for FeCoB (1.5 nm)/Ru (0.95 nm)/FeCoB (1.5 nm)/Ta (7.5 nm)/SiO2/Si structure. II are partial enlarged images for I. Scale bar in I, 20 nm. Scale bar in II, 5 nm. b, c are magnetic hysteresis loops for in-plane FeCoB/Ru/FeCoB SAF heterostructures with different Ru thickness. d Cross-sectional TEM images for (Pt 9 Å/Co 7.5 Å)2/Ru (0.95 nm)/(Co 7.5 Å/Pt 9 Å)2/Ta (3.5 nm)/SiO2/Si structure. II are partial enlarged images for I. Scale bar in I, 50 nm. Scale bar in II, 5 nm. e, f are Ru thickness dependence of magnetic hysteresis loops for out-of-plane (Pt/Co)2/Ru/(Co/Pt)2 SAF heterostructures. g–l Perpendicular dynamic magnetization reversal for (Pt 9 Å/Co 7.5 Å)2/Ru (0.95 nm)/(Co 7.5 Å/Pt 9 Å)2/Ta (3.5 nm) structure observed in polar MOKE mode. Scale bar, 50 μm. Figure (g–i) marked by 1 are the images when H-field decreases from +1000 to +0 Oe. Figure (j–l) marked by 2 are the images when H-field decreases from +0 to −1000 Oe
