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(Color online) (a) Schematic of MTJ with synthetic free layer. Calculated MR loops of SyAF- and SyF-free layer MTJs with M2 thickness of (b) 1.5 nm, and (c) 4 nm. Arrows show magnetic configurations of SyAF- and SyF-free layer MTJs
(Color online) M2 thickness dependence of J c for SyAF-and SyF-free layer MTJs. Vortex formation occurred in M2 layer over 3.2 nm thick.
(Color) (a) Time evolution of normalized resistance of SyAF-free layer MTJ (M2: 4 nm) for two different switching currents: J c = 38 MA/cm2 (switched) and J c = 37 MA/cm2 (un-switched). Corresponding transient magnetization configurations are represented by colored arrows at 1.25 ns for (b) J c = 38 MA/cm2 and (c) J c = 37 MA/cm2. The direction of the arrows indicate in-plane component of magnetization vectors and color code corresponds to 〈my〉 components. Counterclockwise vortex formation was observed at M2 layer of switched MTJ.
(Color online) (a) Time evolution of long-axis magnetization component of SyAF- and SyF-free layer MTJs during 250 °C annealing. (b) Magnitude of magnetization fluctuations at room temperature and 250 °C.
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