Optical and magnetooptical properties of FePt-SiO2 magnetic nanocomposites

被引：0
|
作者：
E. A. Gan’shina
M. Yu. Kochneva
M. V. Vashuk
P. N. Shcherbak
K. Aimuta
M. Inoue
机构：
[1] Moscow State University,
[2] Toyohashi University of Technology,undefined
来源：
Physics of the Solid State | 2005年 / 47卷
关键词：
SiO2; Percolation Threshold; Field Dependence; Magnetization Curve; Effective Medium;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The magnetic, optical, and magnetooptical properties of granular (FePt)1−x(SiO2)x nanocomposites in the disordered state and after heat treatment were studied. The magnetooptical response of samples in which the concentration of the metallic component approached the percolation threshold was observed to become considerably enhanced. Modeling transverse Kerr effect (TKE) spectra in a straightforward effective medium approximation provided a qualitative fit to the experimental data over a broad concentration range. The dependences of the Kerr effect on the SiO2 concentration in the nanocomposite are not monotonic and exhibit a sharp break near the percolation threshold. An analysis of the field dependences of the TKE and magnetization curves revealed that structural changes associated with ordering in annealed FePt films occur only in nanocomposites with fairly large grains.
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页码：1701 / 1706
页数：5
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