Size dependence of microwave permeability of spherical ferromagnetic particles

被引：130

作者：

Viau, G ^{[1
]}

FievetVincent, F ^{[1
]}

Fievet, F ^{[1
]}

Toneguzzo, P ^{[1
]}

Ravel, F ^{[1
]}

Acher, O ^{[1
]}

机构：

[1] CEA,F-91680 BRUYERES CHATEL,FRANCE

来源：

JOURNAL OF APPLIED PHYSICS | 1997年 / 81卷 / 06期

关键词：

D O I：

10.1063/1.363979

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Spherical, monodispersed, ferromagnetic, metallic particles of different compositions were obtained by the polyol process with a mean radius ranging from 30 nm to 1 mu m. The microwave permeability of metallic particles-dielectric matrix composites were studied in the range of 0.1-18 GHz. In the wide particle size range investigated, a size dependence of the dynamic permeability Was observed. Whereas the permeabilty of micrometer-sized particles shows a single resonance band, the permeability of submicrometer-sized particles exhibits several narrow resonance bands which are shifted to high frequencies with decreasing particle size. This latter behavior was found to be in qualitative agreement with the exchange resonance modes calculated by Aharoni. That theory, however, gives an R(-2) dependence on particle radius for the resonance frequency instead of the R(-0.66) dependence observed experimentally. (C) 1997 American Institute of Physics.

引用

页码：2749 / 2754

页数：6

共 24 条

[1] Effect of surface anisotropy on the exchange resonance modes [J].