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Exchange stiffness and damping constants of spin waves in CoFeB films

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Title
Exchange stiffness and damping constants of spin waves in CoFeB films
Author(s)
Gyung-Min Choi
Subject
Spin wave, ; Damping, ; Exchange stiffness, ; CoFeB
Publication Date
2020-12
Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, v.516, pp.167335
Publisher
ELSEVIER
Abstract
© 2020 Elsevier B.V. Exchange stiffness and damping of spin waves in a soft ferromagnet of CoFeB are investigated using a time-resolved pump-probe technique. A pump pulse excites coherent spin waves in CoFeB via optical spin-orbit torque from Pt, and a probe pulse detects the phase of the spin waves via magneto-optic Kerr effect. From the frequency of spin waves, exchange stiffness is determined to be 13 pJ m(-1), which is nearly independent of the CoFeB thickness from 6 to 16 nm and the annealing temperature of 400 degrees C. Damping constant of spin waves is determined from the relaxation of spin waves. Importantly, the spin wave damping increases with decreasing the CoFeB thickness, suggesting the spin pumping effect at the interface between CoFeB and Pt. The thickness dependence of damping becomes stronger after annealing at 400 degrees C, and the spin wave damping of > 0.08 is obtained at a CoFeB thickness of 6.3 nm. Such large damping of spin waves would have an important effect on the operation of the CoFeB-based memory devices
URI
https://pr.ibs.re.kr/handle/8788114/8435
DOI
10.1016/j.jmmm.2020.167335
ISSN
0304-8853
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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