Sohn, Jeong-Woo Song, Hyon-Seok Kim, Ji-Wan Shin, Il-Jae Min, Byoung-Chul You, Chun-Yeol Shin, Sung-Chul 2024-01-20T04:32:22Z 2024-01-20T04:32:22Z 2021-09-05 2016-04 1567-1739 https://pubs.kist.re.kr/handle/201004/124210 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. (C) 2015 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV Gilbert damping in asymmetric MgO(Ta)/CoFeB/Ta(MgO) structures with perpendicular magnetic anisotropy Article 10.1016/j.cap.2015.12.002 1 CURRENT APPLIED PHYSICS, v.16, no.4, pp.481 - 485 CURRENT APPLIED PHYSICS 16 4 481 485 scie scopus kci 000370699200009 2-s2.0-84957806934 Materials Science, Multidisciplinary Physics, Applied Materials Science Physics Article Spin dynamics Gilbert damping Spin pumping CoFeB