Sabino, M.P.R.; Sze Ter Lim; Tran, M., "Composition and Annealing Temperature Dependence of Magnetic Properties in MgO/Co–Fe–B/Ta/Co–Fe–B/MgO Films," in Magnetics, IEEE Transactions on , vol.50, no.11, pp.1-4, Nov. 2014 doi: 10.1109/TMAG.2014.2325908
We study the dependence of anisotropy and damping in MgO/Co-Fe-B/Ta/Co-Fe-B/MgO films on annealing temperature and Co-Fe-B composition by vector network analyzer ferromagnetic resonance. The effective areal magnetic anisotropy Keff · teff and Gilbert damping α in samples with Co40Fe40B20 were found to be constant for 240 °C and 300 °C annealing. As the annealing temperature is increased to 350 °C, both Keff · teff and α decrease. Increasing the Fe content in the Co-Fe-B layer to 60% increases its saturation magnetization, but the resulting increase in demagnetization energy is counteracted by the improvement in interfacial anisotropy. Fe-rich layers also exhibit lower α, although the difference in α is not observed for effective Co-Fe-B thickness less than 1.5 nm-the thickness regime where the largest increase in Keff · teff occurs.
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