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(Color online) STT switching results of a composite free layer structures (inset) that is made up of two ferromagnetic layers that are ferromagnetically exchange coupled. The lower anisotropy layer 1 interacts with the reference layer via the STT interactions. The time traces show the three components of magnetization for layers 1 (dashed) and 2 (solid) during reversal where Mz is normal to the layers.
(Color online) Switching field (HC ), switching current (IC ), and energy barrier (EB ) results for a composite free layer as a function of ferromagnetic exchange coupling (Jex ) in the composite free layer. All quantities are normalized to the values for large Jex . The values for HC and EB are given in (a). IC values are given both AP-to-P and P-to-AP switching for the symmetric Slonczewski (SS) approximation for η(θ) and assuming a flat η(θ) = η 0. The values for a 20-ns current pulses are given in (a) and 2-ns pulses in (b).
(Color online) Micromagnetic results for switching critical currents of a composite free layer for varying current pulse durations (τ) assuming a symmetric Slonczewski approximation for η(θ). Results are shown both for a Jex = 1 ergs/cm2 and a reference calculations where Jex = 10 ergs/cm2.
(Color online) Changes in the critical current as a function of damping parameter in the hard, soft, or both layers. The critical current is normalized to value for αsoft = αhard = 0.1.
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