Frequency dispersion of complex permeability in Mn-Zn and Ni-Zn spinel ferrites and their composite materials
Frequency dispersion of complex permeability in Mn-Zn and Ni-Zn spinel ferrites and their composite materials
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DOI：
10.1063/1.1542651
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发表时间：
2003-03-01
影响因子：
3.2
通讯作者：
Tsutaoka, T
中科院分区：
文献类型：
--
作者：
Tsutaoka, T
本文研究了两种尖晶石型铁氧体（Ni-Zn铁氧体和Mn-Zn铁氧体）及其复合材料的复磁导率谱μ ~*= μ ′-μ ′。通过对实测数据的数值拟合，得到了畴壁共振和自然共振对磁导率谱的贡献。每个组件的频率分散类型，松弛或共振，可以从拟合参数之一，阻尼因子估计。在烧结Mn-Zn铁氧体中，畴壁贡献占主导地位，旋磁自旋共振或弛豫型磁化旋转在Ni-Zn铁氧体中很大。而Mn-Zn和Ni-Zn铁氧体复合材料的弛豫特性均占主导地位。在复合材料中，磁导率值可以通过使用关于退磁场的简单模型的铁氧体颗粒含量来缩放。这一分析对铁氧体复合材料磁导率谱的设计是有用的。(C)2003年，美国物理学会。
Complex permeability spectra mu*=mu'-imu" for two types of spinel ferrites (Ni-Zn ferrite and Mn-Zn ferrite) and their composite materials have been investigated. The contribution of domain-wall and natural resonance to the permeability spectra was estimated by the numerical fitting of actual measurement data to a simple formula. Frequency dispersion type of each component, relaxation or resonance, can be estimated from one of the fitting parameters, damping factor. In sintered Mn-Zn ferrite, domain-wall contribution is dominant and gyromagnetic spin resonance or relaxation-type magnetization rotation is large in Ni-Zn ferrite. However, relaxation character is dominant in both Mn-Zn and Ni-Zn ferrite composite materials. In composite materials, the permeability value can be scaled by the ferrite particle content using a simple model concerning demagnetizing field. This analysis is useful in designing the permeability spectra of ferrite composite materials. (C) 2003 American Institute,of Physics.