Observation of the intrinsic Gilbert damping constant in Co/Ni multilayers independent of the stack number with perpendicular anisotropy

Hyon Seok Song; Kyeong Dong Lee; Jeong Woo Sohn; See Hun Yang; Stuart S.P. Parkin; Chun Yeol You; Sung Chul Shin

doi:10.1063/1.4795013

Observation of the intrinsic Gilbert damping constant in Co/Ni multilayers independent of the stack number with perpendicular anisotropy

Hyon Seok Song, Kyeong Dong Lee, Jeong Woo Sohn, See Hun Yang, Stuart S.P. Parkin, Chun Yeol You, Sung Chul Shin

Department of Physics and Chemistry

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

74 Scopus citations

Abstract

We investigate the intrinsic Gilbert damping constant in perpendicular magnetic anisotropy Co/Ni multilayer system by means of an all-optical method. We find that the intrinsic Gilbert damping constant does not depend on the stack number and the perpendicular magnetic anisotropy when the magnetic field is high enough. In contrast, the extrinsic Gilbert damping is strongly correlated with the inhomogeneous anisotropy distribution in the low-field regime, as observed in magneto-optical images. Intriguingly, the extrinsic Gilbert damping is consistently reduced with decreasing length scale in the measurements, providing a concrete means to determine the intrinsic Gilbert damping.

Original language	English
Article number	102401
Journal	Applied Physics Letters
Volume	102
Issue number	10
DOIs	https://doi.org/10.1063/1.4795013
State	Published - 11 Mar 2013

Bibliographical note

Funding Information:
This work was supported by the NRF funds (Grant Nos. R0A-2007-000-200226-0, 2010-0023798, and 2010-0022040) of the Ministry of Education, Science and Technology of Korea. It was also supported by the DGIST R&D Program of the Ministry of Education, Science and Technology of Korea (11-IT-01).

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title = "Observation of the intrinsic Gilbert damping constant in Co/Ni multilayers independent of the stack number with perpendicular anisotropy",

abstract = "We investigate the intrinsic Gilbert damping constant in perpendicular magnetic anisotropy Co/Ni multilayer system by means of an all-optical method. We find that the intrinsic Gilbert damping constant does not depend on the stack number and the perpendicular magnetic anisotropy when the magnetic field is high enough. In contrast, the extrinsic Gilbert damping is strongly correlated with the inhomogeneous anisotropy distribution in the low-field regime, as observed in magneto-optical images. Intriguingly, the extrinsic Gilbert damping is consistently reduced with decreasing length scale in the measurements, providing a concrete means to determine the intrinsic Gilbert damping.",

author = "Song, \{Hyon Seok\} and Lee, \{Kyeong Dong\} and Sohn, \{Jeong Woo\} and Yang, \{See Hun\} and Parkin, \{Stuart S.P.\} and You, \{Chun Yeol\} and Shin, \{Sung Chul\}",

note = "Funding Information: This work was supported by the NRF funds (Grant Nos. R0A-2007-000-200226-0, 2010-0023798, and 2010-0022040) of the Ministry of Education, Science and Technology of Korea. It was also supported by the DGIST R\&D Program of the Ministry of Education, Science and Technology of Korea (11-IT-01).",

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doi = "10.1063/1.4795013",

language = "English",

volume = "102",

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T1 - Observation of the intrinsic Gilbert damping constant in Co/Ni multilayers independent of the stack number with perpendicular anisotropy

AU - Song, Hyon Seok

AU - Lee, Kyeong Dong

AU - Sohn, Jeong Woo

AU - Yang, See Hun

AU - Parkin, Stuart S.P.

AU - You, Chun Yeol

AU - Shin, Sung Chul

N1 - Funding Information: This work was supported by the NRF funds (Grant Nos. R0A-2007-000-200226-0, 2010-0023798, and 2010-0022040) of the Ministry of Education, Science and Technology of Korea. It was also supported by the DGIST R&D Program of the Ministry of Education, Science and Technology of Korea (11-IT-01).

PY - 2013/3/11

Y1 - 2013/3/11

N2 - We investigate the intrinsic Gilbert damping constant in perpendicular magnetic anisotropy Co/Ni multilayer system by means of an all-optical method. We find that the intrinsic Gilbert damping constant does not depend on the stack number and the perpendicular magnetic anisotropy when the magnetic field is high enough. In contrast, the extrinsic Gilbert damping is strongly correlated with the inhomogeneous anisotropy distribution in the low-field regime, as observed in magneto-optical images. Intriguingly, the extrinsic Gilbert damping is consistently reduced with decreasing length scale in the measurements, providing a concrete means to determine the intrinsic Gilbert damping.

AB - We investigate the intrinsic Gilbert damping constant in perpendicular magnetic anisotropy Co/Ni multilayer system by means of an all-optical method. We find that the intrinsic Gilbert damping constant does not depend on the stack number and the perpendicular magnetic anisotropy when the magnetic field is high enough. In contrast, the extrinsic Gilbert damping is strongly correlated with the inhomogeneous anisotropy distribution in the low-field regime, as observed in magneto-optical images. Intriguingly, the extrinsic Gilbert damping is consistently reduced with decreasing length scale in the measurements, providing a concrete means to determine the intrinsic Gilbert damping.

UR - https://www.scopus.com/pages/publications/84875148271

U2 - 10.1063/1.4795013

DO - 10.1063/1.4795013

M3 - Article

AN - SCOPUS:84875148271

SN - 0003-6951

VL - 102

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 10

M1 - 102401

ER -

Observation of the intrinsic Gilbert damping constant in Co/Ni multilayers independent of the stack number with perpendicular anisotropy

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