Fig. 1: Structure and characterization of CoTb films with a vertical composition gradient. | Nature Communications

Fig. 1: Structure and characterization of CoTb films with a vertical composition gradient.

From: Field-free spin-orbit torque-induced switching of perpendicular magnetization in a ferrimagnetic layer with a vertical composition gradient

Fig. 1: Structure and characterization of CoTb films with a vertical composition gradient.

a Structure of the homogenous Co1-aTba samples. b Net magnetization dependence on the Tb concentration in homogenous CoTb samples. A clear magnetization compensation point is found at the point where Tb concentration equals 0.29. c Structure of the CoTb samples with composition gradient δ. d Net magnetization dependence on δ, showing a linear decrease. e STEM images of the sample with δ = 0.07. f EDS-measured Co and Tb intensity in the sample as a function of vertical position. Co and Tb concentrations show opposite slopes, which verifies the existence as well as the direction of the composition gradient.

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