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We investigate the effect of the buffer-layer materials and their crystallographic structures on the magnetic properties of the CoFeB–MgO stacks. Amorphous Ta, amorphous Mo, and crystalline Mo are used as the buffer layer of CoFeB–MgO. The CoFeB–MgO stacks on both the Mo buffer layers show higher perpendicular anisotropy than that on Ta after 400-°C annealing. Difference is also seen between the samples...
We investigate the CoFeB thickness dependence of the damping constant α of single and double CoFeB-MgO interface structures by vector-network-analyzer ferromagnetic resonance (VNA-FMR). The damping constant increases with decreasing the CoFeB thickness for the single interface structure, and the damping constant for the double-interface structure takes a similar value to that for the single-interface...
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