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

Jeong Woo Sohn; Hyon Seok Song; Ji Wan Kim; Il Jae Shin; Byoung Chul Min; Chun Yeol You; Sung Chul Shin

doi:10.1016/j.cap.2015.12.002

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

Jeong Woo Sohn, Hyon Seok Song, Ji Wan Kim, Il Jae Shin, Byoung Chul Min, Chun Yeol You, Sung Chul Shin

Department of Physics and Chemistry

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

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 α_eff 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.

Original language	English
Pages (from-to)	481-485
Number of pages	5
Journal	Current Applied Physics
Volume	16
Issue number	4
DOIs	https://doi.org/10.1016/j.cap.2015.12.002
State	Published - 1 Apr 2016

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

Keywords

CoFeB
Gilbert damping
Spin dynamics
Spin pumping

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10.1016/j.cap.2015.12.002

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title = "Gilbert damping in asymmetric MgO(Ta)/CoFeB/Ta(MgO) structures with perpendicular magnetic anisotropy",

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.",

keywords = "CoFeB, Gilbert damping, Spin dynamics, Spin pumping",

author = "Sohn, \{Jeong Woo\} and Song, \{Hyon Seok\} and Kim, \{Ji Wan\} and Shin, \{Il Jae\} and Min, \{Byoung Chul\} and You, \{Chun Yeol\} and Shin, \{Sung Chul\}",

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doi = "10.1016/j.cap.2015.12.002",

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T1 - Gilbert damping in asymmetric MgO(Ta)/CoFeB/Ta(MgO) structures with perpendicular magnetic anisotropy

AU - Sohn, Jeong Woo

AU - Song, Hyon Seok

AU - Kim, Ji Wan

AU - Shin, Il Jae

AU - Min, Byoung Chul

AU - You, Chun Yeol

AU - Shin, Sung Chul

PY - 2016/4/1

Y1 - 2016/4/1

N2 - 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.

AB - 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.

KW - CoFeB

KW - Gilbert damping

KW - Spin dynamics

KW - Spin pumping

UR - https://www.scopus.com/pages/publications/84957806934

U2 - 10.1016/j.cap.2015.12.002

DO - 10.1016/j.cap.2015.12.002

M3 - Article

AN - SCOPUS:84957806934

SN - 1567-1739

VL - 16

SP - 481

EP - 485

JO - Current Applied Physics

JF - Current Applied Physics

IS - 4

ER -

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

Abstract

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Keywords

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