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(a) m-H curves for sample A (MgO/CoFeB(2.0)/Ta), (b) sample B (MgO/CoFeB(2.6)/MgO), (c) sample C (MgO/CoFeB(1.6)/Ta(0.4)/ CoFeB(1.0)/MgO), and (d) sample D (MgO/CoFeB(1.6)/Ta(1.0)/CoFeB(1.0)/MgO).
R-H minor curves for DMTJ A (with 0.4 nm Ta) (a), for DMTJ B (with 1.0 nm Ta), where the applied field is limited to the value which switches middle CoFeB alone (b), and for DMTJ B but with field up to 140 mT, which switches both middle and top CoFeB (c) (see inset).
Switching probability as a function of applied magnetic field for DMTJ A (a) and SMTJ (b). Symbols correspond to experimental results and blue solid lines are fitting curves according to Eq. (1). In the figure, Δ, μ 0 H S, and μ 0 H K eff for each MTJ determined by fitting Eq. (1) to experimental results are also shown.
Switching probability as a function of applied current for DMTJ A (a) and SMTJ (b). Symbols correspond to experimental results and dashed lines are fitting curves according to Eq. (2). Determined Δ and I C0 P(AP) are shown in the insets.
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