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Investigation of stiffness and damping constant of spin waves in a soft magnet Co100-x Bx alloy

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Title
Investigation of stiffness and damping constant of spin waves in a soft magnet Co100-x Bx alloy
Author(s)
Choi, Young-Gwan; Gyung-Min Choi
Publication Date
2022-07
Journal
Applied Physics Letters, v.121, no.1
Publisher
American Institute of Physics Inc.
Abstract
© 2022 Author(s).In ferromagnets, alloying provides tunability of magnetic, electrical, and mechanical properties; however, its effect on magnetization has mostly been studied in terms of static properties. In this study, we investigate the stiffness and damping of spin waves in a cobalt-boron (Co100-xBx) alloy using an optical pump-probe technique. Coherent spin waves in Co100-xBx were excited by an optical spin-orbit torque from Pt. The dynamics of the spin wave were monitored on a picosecond timescale using the magneto-optical Kerr effect. From the oscillation period and relaxation of the spin wave, the stiffness and damping of the spin waves were determined. As the boron concentration increases from 0% to 35%, the spin wave stiffness decreases from 4.3 to 1.0 meV nm2, and the damping constant of the spin wave increases from 0.02 to 0.11. Such a large change suggests that B alloying has a significant impact on the spin-wave properties.
URI
https://pr.ibs.re.kr/handle/8788114/12157
DOI
10.1063/5.0098398
ISSN
0003-6951
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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