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

Title
Gilbert damping in asymmetric MgO(Ta)/CoFeB/Ta(MgO) structures with perpendicular magnetic anisotropy
Authors
민병철손정우송현석김지완신일재유천열신성철
Keywords
Spin dynamics; Gilbert damping; Spin pumping; CoFeB
Issue Date
2016-04
Publisher
Current applied physics
Citation
VOL 16, NO 4, 481-485
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.
URI
http://pubs.kist.re.kr/handle/201004/59134
ISSN
15671739
Appears in Collections:
KIST Publication > Article
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