Observations of exchange resonance modes on submicrometer sized ferromagnetic particles

被引：98

作者：

Toneguzzo, P ^{[1
]}

Acher, O ^{[1
]}

Viau, G ^{[1
]}

FievetVincent, F ^{[1
]}

Fievet, F ^{[1
]}

机构：

[1] UNIV PARIS 07,LAB CHIM MAT DIVISES & CATALYSE,F-75251 PARIS 05,FRANCE

来源：

JOURNAL OF APPLIED PHYSICS | 1997年 / 81卷 / 08期

关键词：

D O I：

10.1063/1.364657

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Spherical, monodisperse, submicrometer-sized particles in the CoxNi(100-x) system have been synthesized by the polyol process over the whole chemical composition range. These fine particles have been insulated by a chemical treatment in solution by a superficial layer of MnO2. The microwave permeability of these passivated particles, which are mechanically compacted, has been investigated in the frequency range 0.1-18 GHz. The dynamic permeability measurements exhibit several narrow resonance bands. This experimental behavior is in qualitative agreement with Aharoni's calculation [A. Aharoni, J. Appl. Phys. 69, 7762 (1991)] of exchange resonance modes. The influence of the chemical composition of the ferromagnetic particles upon permeability has been investigated in the microwave range. It is shown that the peaks are shifted towards the high frequencies when atomic Co/Ni ratio increases. (C) 1997 American Institute of Physics.

引用

页码：5546 / 5548

页数：3