CoFeB films deposited on single-crystal MgO(100) exhibit significantly reduced out-of-plane demagnetization fields after magnetic annealing in the film plane, resulting in perpendicular magnetization for a 15 Å CoFeB film. The perpendicular magnetic anisotropy can be enhanced further by inserting a thin Ru capping layer on top of CoFeB, resulting in perpendicular magnetization in even thicker CoFeB films.
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Lee et al. (2011) studied this question.
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