Thickness dependence of the effective damping in epitaxial Fe 3O4/MgO thin films

S. Serrano-Guisan; Wu Han-Chun; C. Boothman; M. Abid; B. S. Chun; I. V. Shvets; H. W. Schumacher

doi:10.1063/1.3531989

Thickness dependence of the effective damping in epitaxial Fe ₃O₄/MgO thin films

S. Serrano-Guisan, Wu Han-Chun, C. Boothman, M. Abid^*, B. S. Chun, I. V. Shvets, H. W. Schumacher

^*Corresponding author for this work

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

29 Citations (Scopus)

Abstract

The precessional magnetization dynamics of high quality epitaxial magnetite (Fe₃O₄) thin films growth on MgO are investigated by inductive magnetization dynamic measurements in time and frequency domain. An upper bound for the intrinsic Gilbert damping parameter of α₀ =0.037±0.001 is derived, which is significantly lower than previously reported for epitaxial Fe₃O₄ on GaAs. With increasing film thickness from 5 up to 100 nm a strong increase in the effective damping up to 0.2 is observed which cannot be explained by simple nonuniform spin wave excitations. Possible origins of this effect are discussed.

Original language	English
Article number	013907
Journal	Journal of Applied Physics
Volume	109
Issue number	1
DOIs	https://doi.org/10.1063/1.3531989
Publication status	Published - 1 Jan 2011
Externally published	Yes

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abstract = "The precessional magnetization dynamics of high quality epitaxial magnetite (Fe3O4) thin films growth on MgO are investigated by inductive magnetization dynamic measurements in time and frequency domain. An upper bound for the intrinsic Gilbert damping parameter of α0 =0.037±0.001 is derived, which is significantly lower than previously reported for epitaxial Fe3O4 on GaAs. With increasing film thickness from 5 up to 100 nm a strong increase in the effective damping up to 0.2 is observed which cannot be explained by simple nonuniform spin wave excitations. Possible origins of this effect are discussed.",

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AU - Serrano-Guisan, S.

AU - Han-Chun, Wu

AU - Boothman, C.

AU - Abid, M.

AU - Chun, B. S.

AU - Shvets, I. V.

AU - Schumacher, H. W.

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N2 - The precessional magnetization dynamics of high quality epitaxial magnetite (Fe3O4) thin films growth on MgO are investigated by inductive magnetization dynamic measurements in time and frequency domain. An upper bound for the intrinsic Gilbert damping parameter of α0 =0.037±0.001 is derived, which is significantly lower than previously reported for epitaxial Fe3O4 on GaAs. With increasing film thickness from 5 up to 100 nm a strong increase in the effective damping up to 0.2 is observed which cannot be explained by simple nonuniform spin wave excitations. Possible origins of this effect are discussed.

AB - The precessional magnetization dynamics of high quality epitaxial magnetite (Fe3O4) thin films growth on MgO are investigated by inductive magnetization dynamic measurements in time and frequency domain. An upper bound for the intrinsic Gilbert damping parameter of α0 =0.037±0.001 is derived, which is significantly lower than previously reported for epitaxial Fe3O4 on GaAs. With increasing film thickness from 5 up to 100 nm a strong increase in the effective damping up to 0.2 is observed which cannot be explained by simple nonuniform spin wave excitations. Possible origins of this effect are discussed.

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Thickness dependence of the effective damping in epitaxial Fe ₃O₄/MgO thin films

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