Gilbert damping in asymmetric MgO(Ta)/CoFeB/Ta(MgO) structures with perpendicular magnetic anisotropy

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We investigate the ultrafast magnetization dynamics of perpendicularly magnetized MgO/CoFeB/Ta and Ta/CoFeB/MgO stack structures using an all-optical time-resolved magneto-optical Kerr measurement technique. We find that the effective Gilbert damping parameter alpha(eff) converges to a low value of similar to 0.02 in the high external field regime, and it stays unchanged at similar to 0.02 regardless of the pump fluence. Two asymmetric stack structures of CoFeB show identical dynamic behavior and Gilbert damping, implying that the influence of the under and top interfaces is not distinct.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2016-04
Language
English
Article Type
Article
Citation

CURRENT APPLIED PHYSICS, v.16, no.4, pp.481 - 485

ISSN
1567-1739
DOI
10.1016/j.cap.2015.12.002
URI
http://hdl.handle.net/10203/207591
Appears in Collection
RIMS Journal Papers
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