Figure 3
Experimental room-temperature stability diagram for perpendicular
. Filled symbols indicate features that are reproducible between samples. Open symbols show transitions that can differ in number and position between samples. SLR (SHR) denotes a region of static low (high) resistance. Squares indicate the onset of small angle precession. Triangles denote the position of frequency steps. Diamonds show kinks in the dependence of
on
. Circles denote points where the microwave signal drops below measurable values. Lines indicate peaks in
. (b) Theoretical room-temperature stability diagram obtained by numerical solution of the LLG equation with the Slonczewski spin-torque term [
1]. Solid lines separate SLR, SHR, and dynamical states (precession
). Dotted and dashed lines show the transition from small-angle precession about the
equilibrium angle to large-angle precession about
, associated with a step in
(dashed line) or a kink in
vs
(dotted line). At the
time scale in the simulations, transitions between the SLR and SHR states are hysteretic [
18], with the boundary given by the black line for increasing
and the gray line for decreasing
.
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