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(a) The magnetic hysteresis loop measurement by p-MOKE. (b) Anisotropy as a function of the multilayer stack number N. The inset shows the structure of the Co/Ni multilayer films. (c) Field-swept domain reversal patterns measured using a magneto-optical microscope magnetometer at N = 6, 15, and 24. White color represents the unreversed area.
(a) A schematic of the experimental setup (BS: beam splitter; W-PBS: Wollaston polarizing beam splitter; BD: balanced detector). (b) Time-resolved Kerr signals (open symbols) and fitting curves (solid curves) with [Co/Ni]N multilayer films of N = 6–27. Experimental data (solid symbols) and fitting curves (solid curves) of (c) the resonance frequency f, (d) the inverse of the relaxation time τ −1, and (e) the effective damping constant α eff as a function of the external magnet field H when θH = 60°. Note that the size of the error bar in (a) is similar to that of the data symbol.
(a) The dependence of α eff on the stack number N and (b) the effective PMA energy density K eff. Red and black solid circles represent the data of the low external magnet field H = 3.2 kOe and the high external magnet field H = 5.0 kOe, respectively.
(a) Effective Gilbert damping constant α eff as a function of the probe beam spot area with various degrees ofmagnification by an objective lens at10×, 20×, 50×, and 100× when H = 3 kOe at θH = 60°. (b) The value of α eff as a function of the pump fluence F. The black and red dashed lines are visual guide lines whose values are obtained from Fig. 2(e) with H = 5.5 kOe.
Fitted and extracted values obtained in Co/Ni multilayer films when N = 6, 15, and 24. The values are determined by VSM and SQUID measurements while the other values are obtained by the fitting procedure.
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