Q-band ferromagnetic resonance for CoPt-based stacked perpendicular recording media with interlayer exchange coupling

Shintaro Hinata; Shin Saito; Daiji Hasegawa; Migaku Takahashi

doi:10.1063/1.3569843

Q-band ferromagnetic resonance for CoPt-based stacked perpendicular recording media with interlayer exchange coupling

Shintaro Hinata, Shin Saito, Daiji Hasegawa, Migaku Takahashi

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

11 Citations (Scopus)

Abstract

The ferromagnetic interlayer exchange coupling J_inter for stacked perpendicular recording media with a granular layer (GL)/interlayer (IL)/alloy capping layer (CL) structure was quantitatively evaluated by Q-band ferromagnetic resonance (FMR). Two resonances with acoustic and optical precession modes were observed in the FMR signals from the stacked media. Fitting using the Landau-Lifshitz-Gilbert (LLG) equation indicated that J _inter increased from 0.55 to 1.83 erg/cm² when the Pt IL thickness was reduced from 2.0 to 1.0 nm for media based on Co ₈₂Cr₁₀Pt₈-CL (4 nm) and Co₇₄Pt ₁₆Cr₁₀-8 mol (SiO₂)-GL (16 nm). The optimum Pt IL thickness at which the switching field distribution was minimized due to a large reduction in the saturation field of the stacked media was found to correspond to the boundary condition between antiparallel and parallel precession of the magnetic moments of the GL and CL in FMR.

Original language	English
Article number	083935
Journal	Journal of Applied Physics
Volume	109
Issue number	8
DOIs	https://doi.org/10.1063/1.3569843
Publication status	Published - 2011 Apr 15
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Q-band ferromagnetic resonance for CoPt-based stacked perpendicular recording media with interlayer exchange coupling",

abstract = "The ferromagnetic interlayer exchange coupling Jinter for stacked perpendicular recording media with a granular layer (GL)/interlayer (IL)/alloy capping layer (CL) structure was quantitatively evaluated by Q-band ferromagnetic resonance (FMR). Two resonances with acoustic and optical precession modes were observed in the FMR signals from the stacked media. Fitting using the Landau-Lifshitz-Gilbert (LLG) equation indicated that J inter increased from 0.55 to 1.83 erg/cm2 when the Pt IL thickness was reduced from 2.0 to 1.0 nm for media based on Co 82Cr10Pt8-CL (4 nm) and Co74Pt 16Cr10-8 mol (SiO2)-GL (16 nm). The optimum Pt IL thickness at which the switching field distribution was minimized due to a large reduction in the saturation field of the stacked media was found to correspond to the boundary condition between antiparallel and parallel precession of the magnetic moments of the GL and CL in FMR.",

author = "Shintaro Hinata and Shin Saito and Daiji Hasegawa and Migaku Takahashi",

note = "Funding Information: We would like to thank Professor Dr. Nobuyuki Inaba from Yamagata University for valuable discussion on the linewidths of FMR signals. This study was partially supported by Industrial Technology Research Grant Program in 2006 from New Energy and Industrial Technology Development Organization (NEDO) of Japan. ",

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AU - Saito, Shin

AU - Hasegawa, Daiji

AU - Takahashi, Migaku

N1 - Funding Information: We would like to thank Professor Dr. Nobuyuki Inaba from Yamagata University for valuable discussion on the linewidths of FMR signals. This study was partially supported by Industrial Technology Research Grant Program in 2006 from New Energy and Industrial Technology Development Organization (NEDO) of Japan.

PY - 2011/4/15

Y1 - 2011/4/15

N2 - The ferromagnetic interlayer exchange coupling Jinter for stacked perpendicular recording media with a granular layer (GL)/interlayer (IL)/alloy capping layer (CL) structure was quantitatively evaluated by Q-band ferromagnetic resonance (FMR). Two resonances with acoustic and optical precession modes were observed in the FMR signals from the stacked media. Fitting using the Landau-Lifshitz-Gilbert (LLG) equation indicated that J inter increased from 0.55 to 1.83 erg/cm2 when the Pt IL thickness was reduced from 2.0 to 1.0 nm for media based on Co 82Cr10Pt8-CL (4 nm) and Co74Pt 16Cr10-8 mol (SiO2)-GL (16 nm). The optimum Pt IL thickness at which the switching field distribution was minimized due to a large reduction in the saturation field of the stacked media was found to correspond to the boundary condition between antiparallel and parallel precession of the magnetic moments of the GL and CL in FMR.

AB - The ferromagnetic interlayer exchange coupling Jinter for stacked perpendicular recording media with a granular layer (GL)/interlayer (IL)/alloy capping layer (CL) structure was quantitatively evaluated by Q-band ferromagnetic resonance (FMR). Two resonances with acoustic and optical precession modes were observed in the FMR signals from the stacked media. Fitting using the Landau-Lifshitz-Gilbert (LLG) equation indicated that J inter increased from 0.55 to 1.83 erg/cm2 when the Pt IL thickness was reduced from 2.0 to 1.0 nm for media based on Co 82Cr10Pt8-CL (4 nm) and Co74Pt 16Cr10-8 mol (SiO2)-GL (16 nm). The optimum Pt IL thickness at which the switching field distribution was minimized due to a large reduction in the saturation field of the stacked media was found to correspond to the boundary condition between antiparallel and parallel precession of the magnetic moments of the GL and CL in FMR.

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Q-band ferromagnetic resonance for CoPt-based stacked perpendicular recording media with interlayer exchange coupling

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