MTJ structure with non-collinear polarizer layer. F1,2,3 are the ferromagnetic layers. I, NM, and AFM are the insulating, non-magnetic, and antiferromagnetic layers, respectively. The positive current is defined from the bottom to top electrodes, and the x-axis is the long axis of the ellipse. The average magnetization angle of the polarizer layer, , is also depicted. A, B, C, and D indicate specific positions in the switching layer.
Normalized switching current density obtained from the micromagnetic simulations, macro-spin models, and Eq. (5) as a function of the polarizer layer magnetization direction . Here, J c0 = 2.7 1011 A/m2 for the micromagnetic simulation, J c0 = 1.84 1011 A/m2 for the analytic macro-spin model, and J c0 = 2.17 1011 A/m2 for the numerical macro-spin simulation.
Snapshots of spin configurations of the switching layer with the collinear ( ) polarizer layer at a specific time with the switching current density. (a) t = 6.44 ns, (b) t = 6.51 ns, (c) t = 8.99 ns, and (d) t = 9.36 ns. (e) Time-dependent normalized magnetization at specific positions (A, B, C, and D), and total magnetization with the collinear polarizer layer.
Snapshots of spin configurations of the switching layer with the non-collinear ( ) polarizer layer at specific times with the switching current density. (a) t = 4.13 ns, (b) t = 6.00 ns, (c) t = 6.13 ns, and (d) t = 9.60 ns. (e) Time-dependent normalized magnetization at specific positions (A, B, C, and D), and total magnetization with the non-collinear polarizer layer.
Switching current density as a function of (a) the exchange stiffness constant A ex for the 80 × 40 nm2 junctions, (b) the long axis of the ellipse with a 30 nm short axis and A ex = 2.0 × 10−11 J/m. The blue and red circles represent collinear ( ) and non-collinear ( ) polarizer layers, respectively.
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