Composition and Annealing Temperature Dependence of Magnetic Properties in MgO/Co–Fe–B/Ta/Co–Fe–B/MgO Films

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Composition and Annealing Temperature Dependence of Magnetic Properties in MgO/Co–Fe–B/Ta/Co–Fe–B/MgO Films
Title:
Composition and Annealing Temperature Dependence of Magnetic Properties in MgO/Co–Fe–B/Ta/Co–Fe–B/MgO Films
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Magnetics, IEEE Transactions on
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Publication Date:
18 November 2014
Citation:
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
Abstract:
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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(c) 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
ISSN:
0018-9464
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