Large anisotropy of Gilbert damping constant in L21-ordered Co2FeSi film

Yuichi Kasatani; Shinya Yamada; Hiroyoshi Itoh; Masanobu Miyao; Kohei Hamaya; Yukio Nozaki

doi:10.7567/APEX.7.123001

Large anisotropy of Gilbert damping constant in L2₁-ordered Co₂FeSi film

Yuichi Kasatani, Shinya Yamada, Hiroyoshi Itoh, Masanobu Miyao, Kohei Hamaya, Yukio Nozaki

Department of Physics

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

17 Citations (Scopus)

Abstract

We experimentally demonstrated anisotropic damping of the magnetization dynamics in a highly ordered Heusler compound Co_3-xFe_xSi (x = 1.0, 2.0, and 3.0). The field-swept ferromagnetic resonance linewidth as a function of the resonant frequency was measured to exclude extrinsic contributions from two-magnon scattering and inhomogeneous line-broadening. In L21-ordered Co2FeSi film, a wide variation in the intrinsic Gilbert damping constant from 0.0023 to 0.0061 was clearly observed in the (111) plane, where a weak uniaxial magnetic anisotropy was formed via low-temperature epitaxial growth. The large anisotropy of the Gilbert damping constant was suppressed by increasing x, which suppresses the halfmetallicity in Co_3-xFe_xSi films.

Original language	English
Pages (from-to)	123001
Number of pages	1
Journal	Applied Physics Express
Volume	7
Issue number	12
DOIs	https://doi.org/10.7567/APEX.7.123001
Publication status	Published - 2014 Dec 1

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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abstract = "We experimentally demonstrated anisotropic damping of the magnetization dynamics in a highly ordered Heusler compound Co3-xFexSi (x = 1.0, 2.0, and 3.0). The field-swept ferromagnetic resonance linewidth as a function of the resonant frequency was measured to exclude extrinsic contributions from two-magnon scattering and inhomogeneous line-broadening. In L21-ordered Co2FeSi film, a wide variation in the intrinsic Gilbert damping constant from 0.0023 to 0.0061 was clearly observed in the (111) plane, where a weak uniaxial magnetic anisotropy was formed via low-temperature epitaxial growth. The large anisotropy of the Gilbert damping constant was suppressed by increasing x, which suppresses the halfmetallicity in Co3-xFexSi films.",

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AU - Kasatani, Yuichi

AU - Yamada, Shinya

AU - Itoh, Hiroyoshi

AU - Miyao, Masanobu

AU - Hamaya, Kohei

AU - Nozaki, Yukio

PY - 2014/12/1

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N2 - We experimentally demonstrated anisotropic damping of the magnetization dynamics in a highly ordered Heusler compound Co3-xFexSi (x = 1.0, 2.0, and 3.0). The field-swept ferromagnetic resonance linewidth as a function of the resonant frequency was measured to exclude extrinsic contributions from two-magnon scattering and inhomogeneous line-broadening. In L21-ordered Co2FeSi film, a wide variation in the intrinsic Gilbert damping constant from 0.0023 to 0.0061 was clearly observed in the (111) plane, where a weak uniaxial magnetic anisotropy was formed via low-temperature epitaxial growth. The large anisotropy of the Gilbert damping constant was suppressed by increasing x, which suppresses the halfmetallicity in Co3-xFexSi films.

AB - We experimentally demonstrated anisotropic damping of the magnetization dynamics in a highly ordered Heusler compound Co3-xFexSi (x = 1.0, 2.0, and 3.0). The field-swept ferromagnetic resonance linewidth as a function of the resonant frequency was measured to exclude extrinsic contributions from two-magnon scattering and inhomogeneous line-broadening. In L21-ordered Co2FeSi film, a wide variation in the intrinsic Gilbert damping constant from 0.0023 to 0.0061 was clearly observed in the (111) plane, where a weak uniaxial magnetic anisotropy was formed via low-temperature epitaxial growth. The large anisotropy of the Gilbert damping constant was suppressed by increasing x, which suppresses the halfmetallicity in Co3-xFexSi films.

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Large anisotropy of Gilbert damping constant in L2₁-ordered Co₂FeSi film

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