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In-plane and perpendicular M(H) loops of Ta (5.0)/Mg (0.4)/MgO (2.2)/Mg (1.2)/Ta (1.0) (in nm) multilayers annealed at . The Mg thickness was varied as (a), 0.2 nm (b), 0.4 nm (c), 0.6 nm (d), 0.8 nm (e), and 1.0 nm (f). The inset figures in (a)-(e) show the enlarged perpendicular M(H) loops.
(a) and (b) show the diagram of squareness (SQ) and of thin CoFeB films in the direction perpendicular to film as a function of Mg thickness () and annealing temperature ().
Interfacial anisotropy of CoFeB films as a function of Mg insertion thickness () for different (in log scale). The inset shows the values obtained from VSM and FMR for samples annealed at .
(a) FMR differential absorption spectrum, (b) the dependence of , and (c) effective damping constant of MgO/Mg/CoFeB/Ta films with annealed at . (d) The minimum effective damping constant as a function of .
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