Microwave properties of composites with chromium dioxide

被引：6

作者：

Starostenko, Sergey N. ^{[1
]}

Rozanov, Konstantin N. ^{[1
]}

Osipov, Aleksey V. ^{[1
]}

机构：

[1] Inst Theoret & Appl Electromagnet, Moscow 125412, Russia

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2006年 / 300卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

Composite; Microwave permittivity; Microwave permeability; Impedance; Absorption spectrum;

D O I：

10.1016/j.jmmm.2005.10.151

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The permittivity and permeability of composites filled with CrO2 powder are measured within the frequency range from 0.05 to 12 GHz. A sharp line of magnetic absorption is detected near 8 GHz. The effects of magnetic bias and remanence on the permittivity and permeability spectra are analyzed. The hysteretic behavior of dynamic permeability is observed for both parallel and perpendicular bias orientations relative to the microwave magnetic field. The effect is due to switching of the magnetic texture under bias equal to coercive field. At 50 MHz the parallel bias close to coercive field affects permeability much stronger than the perpendicular one. At 10 GHz the effect of perpendicular bias is higher than that of the parallel one. The effect of remanence on the microwave permeability is negligible. The 3 kOe parallel bias suppresses the line of magnetic absorption and decreases the conductivity of the composite and its microwave permittivity. This can be attributed to the magnetostatic interaction of inclusions in the vicinity of the percolation threshold. (C) 2005 Elsevier B.V. All rights reserved.

引用

页码：E70 / E73

页数：4

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