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

被引：25
|
作者：
Serrano-Guisan, S. [1 ]
Wu, Han-Chun [2 ]
Boothman, C. [2 ]
Abid, M. [2 ]
Chun, B. S. [3 ]
Shvets, I. V. [2 ]
Schumacher, H. W. [1 ]
机构：
[1] Phys Tech Bundesanstalt, D-38116 Braunschweig, Germany
[2] Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland
[3] Korea Univ, Dept Mat Sci & Engn, Seoul 136713, South Korea
来源：
JOURNAL OF APPLIED PHYSICS | 2011年 / 109卷 / 01期
关键词：
MAGNETIZATION DYNAMICS; SPIN-VALVE; OXIDE; MAGNETORESISTANCE; PERMALLOY; BEHAVIOR; WAVES; IRON;
D O I：
10.1063/1.3531989
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 alpha(0) =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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3531989]
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页数：4
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