Thickness dependence of the effective damping in epitaxial Fe3O4/MgO thin films

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 i...

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Published inJournal of applied physics Vol. 109; no. 1
Main Authors Serrano-Guisan, S., Wu, Han-Chun, Boothman, C, Abid, M., Chun, B. S., Shvets, I. V., Schumacher, H. W.
Format Journal Article
LanguageEnglish
Published 01.01.2011
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Summary: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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3531989