Damping factor estimation using spin wave attenuation in permalloy film

Takashi Manago; Kazuto Yamanoi; Shinya Kasai; Seiji Mitani

doi:10.1063/1.4914538

Damping factor estimation using spin wave attenuation in permalloy film

Takashi Manago, Kazuto Yamanoi, Shinya Kasai, Seiji Mitani

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

9 Citations (Scopus)

Abstract

Damping factor of a Permalloy (Py) thin film is estimated by using the magnetostatic spin wave propagation. The attenuation lengths are obtained by the dependence of the transmission intensity on the antenna distance, and decrease with increasing magnetic fields. The relationship between the attenuation length, damping factor, and external magnetic field is derived theoretically, and the damping factor was determined to be 0.0063 by fitting the magnetic field dependence of the attenuation length, using the derived equation. The obtained value is in good agreement with the general value of Py. Thus, this estimation method of the damping factor using spin waves attenuation can be useful tool for ferromagnetic thin films.

Original language	English
Article number	17D121
Journal	Journal of Applied Physics
Volume	117
Issue number	17
DOIs	https://doi.org/10.1063/1.4914538
Publication status	Published - 2015 May 7
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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AU - Manago, Takashi

AU - Yamanoi, Kazuto

AU - Kasai, Shinya

AU - Mitani, Seiji

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N2 - Damping factor of a Permalloy (Py) thin film is estimated by using the magnetostatic spin wave propagation. The attenuation lengths are obtained by the dependence of the transmission intensity on the antenna distance, and decrease with increasing magnetic fields. The relationship between the attenuation length, damping factor, and external magnetic field is derived theoretically, and the damping factor was determined to be 0.0063 by fitting the magnetic field dependence of the attenuation length, using the derived equation. The obtained value is in good agreement with the general value of Py. Thus, this estimation method of the damping factor using spin waves attenuation can be useful tool for ferromagnetic thin films.

AB - Damping factor of a Permalloy (Py) thin film is estimated by using the magnetostatic spin wave propagation. The attenuation lengths are obtained by the dependence of the transmission intensity on the antenna distance, and decrease with increasing magnetic fields. The relationship between the attenuation length, damping factor, and external magnetic field is derived theoretically, and the damping factor was determined to be 0.0063 by fitting the magnetic field dependence of the attenuation length, using the derived equation. The obtained value is in good agreement with the general value of Py. Thus, this estimation method of the damping factor using spin waves attenuation can be useful tool for ferromagnetic thin films.

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