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Dynamic and temperature effects in microwave assisted switching: Evidence of chaotic macrospin dynamics
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Time dependence of the applied magnetic fields: a bias pulse reversing field along x (easy) axis together with a continuous applied ac excitation along y axis (a) and a pulsed ac excitation (b), respectively. Sinusoidal time dependence for the pulse rise/fall are assumed. The waiting time is long enough to reach the equilibrium. (c) and (d) Chaotic time evolution of magnetization when only a continuous ac excitation is applied, for α = 0.01, f ac = 0.75 and h ac = 0.2: f 0Δt = 5 × 10−3 (line) and f 0Δt = 10−3 (dash).

Image of FIG. 2.
FIG. 2.

(Color online) Contour plot of the reversal field as function of ac field frequency and amplitude, with a continuous applied ac excitation. In the hatched regions, the switch is driven only by the ac excitation. The level curves for 0.2, 0.4, 0.6, and 0.8 are also presented. In the white regions, referred to as nonswitching regions, no switches have been obtained for h pulse,max ≤ 2. The vertical grayscale bar gives the required dc field along EA to reverse the magnetic moment, if a dc field with the value indicated in the vertical axis is applied along y axis (SW limit).

Image of FIG. 3.
FIG. 3.

(Color online) Similar with Fig. 2 but with a pulsed ac excitation.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dynamic and temperature effects in microwave assisted switching: Evidence of chaotic macrospin dynamics