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Observation of the intrinsic Gilbert damping constant in Co/Ni multilayers independent of the stack number with perpendicular anisotropy
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10.1063/1.4795013
/content/aip/journal/apl/102/10/10.1063/1.4795013
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/10/10.1063/1.4795013

Figures

Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

(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.

Tables

Generic image for table
Table I.

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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/content/aip/journal/apl/102/10/10.1063/1.4795013
2013-03-11
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Observation of the intrinsic Gilbert damping constant in Co/Ni multilayers independent of the stack number with perpendicular anisotropy
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/10/10.1063/1.4795013
10.1063/1.4795013
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