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  • Title: Investigation of split CoFeB/Ta/CoFeB/MgO stacks for magnetic memories applications.
    Author: Kaidatzis A, Gopman DB, Bran C, García-Martín JM, Vázquez M, Niarchos D.
    Journal: J Magn Magn Mater; 2018; 473():. PubMed ID: 33060887.
    Abstract:
    We report on the static and dynamic magnetic properties of W/CoFeB/Ta/CoFeB/MgO stacks, where the CoFeB layer is split in two by a 0.3 nm-thick Ta "dusting" layer. A total CoFeB thickness between 1.2 and 2.4 nm is studied. Perpendicular magnetic anisotropy is obtained for thickness below 1.8 nm even at the as-deposited stacks, and it is enhanced after annealing. Saturation magnetization is 1520 (1440) kA/m before (after) annealing, increased compared to non-split CoFeB layers. Ferromagnetic resonance measurements show that high magnetic anisotropy energy may be achieved (effective anisotropy field 0.571 ± 0.003 T), combined to a moderate Gilbert damping (0.030 ± 0.001). We argue that the above characteristics make the split-CoFeB system advantageous for spintronics applications.
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