Observation of the intrinsic Gilbert damping constant in Co/Ni multilayers independent of the stack number with perpendicular anisotropy

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We investigate the intrinsic Gilbert damping constant in perpendicular magnetic anisotropy Co/Ni multilayer system by means of an all-optical method. We find that the intrinsic Gilbert damping constant does not depend on the stack number and the perpendicular magnetic anisotropy when the magnetic field is high enough. In contrast, the extrinsic Gilbert damping is strongly correlated with the inhomogeneous anisotropy distribution in the low-field regime, as observed in magneto-optical images. Intriguingly, the extrinsic Gilbert damping is consistently reduced with decreasing length scale in the measurements, providing a concrete means to determine the intrinsic Gilbert damping. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4795013]
Publisher
AMER INST PHYSICS
Issue Date
2013-03
Language
English
Article Type
Article
Keywords

INDUCED MAGNETIZATION REVERSAL; DYNAMICS

Citation

APPLIED PHYSICS LETTERS, v.102, no.10, pp.102401

ISSN
0003-6951
DOI
10.1063/1.4795013
URI
http://hdl.handle.net/10203/191131
Appears in Collection
RIMS Journal Papers
Files in This Item
000316501200040.pdf(2.55 MB)Download
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