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Gilbert damping in asymmetric MgO(Ta)/CoFeB/Ta(MgO) structures with perpendicular magnetic anisotropy
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Title
Gilbert damping in asymmetric MgO(Ta)/CoFeB/Ta(MgO) structures with perpendicular magnetic anisotropy
Issued Date
2016-04
Citation
Sohn, Jeong-Woo. (2016-04). Gilbert damping in asymmetric MgO(Ta)/CoFeB/Ta(MgO) structures with perpendicular magnetic anisotropy. Current Applied Physics, 16(4), 481–485. doi: 10.1016/j.cap.2015.12.002
Type
Article
Author Keywords
Spin dynamics ; Gilbert damping ; Spin pumping ; CoFeB
Keywords
Cobalt Compounds ; CoFeB ; Damping ; Dynamic Behaviors ; Gilbert Damping ; Gilbert Damping Parameter ; Magnesia ; Magnetic Anisotropy ; Magneto-Optical Kerr Measurements ; Perpendicular Magnetic Anisotropy ; Spin-Pumping ; Spin Dynamics ; Spin Pumping ; Ultrafast Magnetization Dynamics
ISSN
1567-1739
Abstract
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 αeff converges to a low value of ∼0.02 in the high external field regime, and it stays unchanged at ∼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. © 2015 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/2704
DOI
10.1016/j.cap.2015.12.002
Publisher
Elsevier B.V.
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