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