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Role of non-collinear polarizer layer in spin transfer torque switching processes
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10.1063/1.4812585
/content/aip/journal/jap/114/1/10.1063/1.4812585
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/1/10.1063/1.4812585
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

MTJ structure with non-collinear polarizer layer. F 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 -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.

Image of FIG. 2.
FIG. 2.

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,  = 2.7 10 A/m for the micromagnetic simulation,  = 1.84 10 A/m for the analytic macro-spin model, and  = 2.17 10 A/m for the numerical macro-spin simulation.

Image of FIG. 3.
FIG. 3.

Snapshots of spin configurations of the switching layer with the collinear ( ) polarizer layer at a specific time with the switching current density. (a)  = 6.44 ns, (b)  = 6.51 ns, (c)  = 8.99 ns, and (d)  = 9.36 ns. (e) Time-dependent normalized magnetization at specific positions (A, B, C, and D), and total magnetization with the collinear polarizer layer.

Image of FIG. 4.
FIG. 4.

Snapshots of spin configurations of the switching layer with the non-collinear ( ) polarizer layer at specific times with the switching current density. (a)  = 4.13 ns, (b)  = 6.00 ns, (c)  = 6.13 ns, and (d)  = 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.

Image of FIG. 5.
FIG. 5.

Switching current density as a function of (a) the exchange stiffness constant for the 80 × 40 nm junctions, (b) the long axis of the ellipse with a 30 nm short axis and  = 2.0 × 10 J/m. The blue and red circles represent collinear ( ) and non-collinear ( ) polarizer layers, respectively.

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/content/aip/journal/jap/114/1/10.1063/1.4812585
2013-07-01
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Role of non-collinear polarizer layer in spin transfer torque switching processes
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/1/10.1063/1.4812585
10.1063/1.4812585
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